diff --git a/src/http/modules/ngx_http_geo_module.c b/src/http/modules/ngx_http_geo_module.c
index f0a12b3..5fc6321 100644
--- a/src/http/modules/ngx_http_geo_module.c
+++ b/src/http/modules/ngx_http_geo_module.c
@@ -10,15 +10,48 @@
 
 
 typedef struct {
-    ngx_radix_tree_t   *tree;
-    ngx_rbtree_t        rbtree;
-    ngx_rbtree_node_t   sentinel;
-    ngx_pool_t         *pool;
+    u_short                      start;
+    u_short                      end;
+    ngx_http_variable_value_t   *value;
+} ngx_http_geo_range_t;
+
+
+typedef struct {
+    ngx_http_geo_range_t        *ranges;
+    ngx_uint_t                   n;
+} ngx_http_geo_low_ranges_t;
+
+
+typedef struct {
+    ngx_http_geo_low_ranges_t    low[0x10000];
+    ngx_http_variable_value_t   *default_value;
+} ngx_http_geo_high_ranges_t;
+
+
+typedef struct {
+    ngx_http_variable_value_t   *value;
+    ngx_str_t                   *net;
+    ngx_http_geo_high_ranges_t  *high;
+    ngx_radix_tree_t            *tree;
+    ngx_rbtree_t                 rbtree;
+    ngx_rbtree_node_t            sentinel;
+    ngx_pool_t                  *pool;
+    ngx_pool_t                  *temp_pool;
 } ngx_http_geo_conf_ctx_t;
 
 
 static char *ngx_http_geo_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
 static char *ngx_http_geo(ngx_conf_t *cf, ngx_command_t *dummy, void *conf);
+static char *ngx_http_geo_range(ngx_conf_t *cf, ngx_http_geo_conf_ctx_t *ctx,
+    ngx_str_t *value);
+static char *ngx_http_geo_add_range(ngx_conf_t *cf,
+    ngx_http_geo_conf_ctx_t *ctx, in_addr_t start, in_addr_t end);
+static ngx_uint_t ngx_http_geo_delete_range(ngx_conf_t *cf,
+    ngx_http_geo_conf_ctx_t *ctx, in_addr_t start, in_addr_t end);
+static char *ngx_http_geo_cidr(ngx_conf_t *cf, ngx_http_geo_conf_ctx_t *ctx,
+    ngx_str_t *value);
+static ngx_http_variable_value_t *ngx_http_geo_value(ngx_conf_t *cf,
+    ngx_http_geo_conf_ctx_t *ctx, ngx_str_t *value);
 
 
 static ngx_command_t  ngx_http_geo_commands[] = {
@@ -68,7 +101,7 @@
 /* AF_INET only */
 
 static ngx_int_t
-ngx_http_geo_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v,
+ngx_http_geo_cidr_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v,
     uintptr_t data)
 {
     ngx_radix_tree_t *tree = (ngx_radix_tree_t *) data;
@@ -76,11 +109,11 @@
     struct sockaddr_in         *sin;
     ngx_http_variable_value_t  *vv;
 
-    sin = (struct sockaddr_in *) r->connection->sockaddr;
-
     ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
                    "http geo started");
 
+    sin = (struct sockaddr_in *) r->connection->sockaddr;
+
     vv = (ngx_http_variable_value_t *)
                        ngx_radix32tree_find(tree, ntohl(sin->sin_addr.s_addr));
 
@@ -93,14 +126,55 @@
 }
 
 
+static ngx_int_t
+ngx_http_geo_range_variable(ngx_http_request_t *r, ngx_http_variable_value_t *v,
+    uintptr_t data)
+{
+    ngx_http_geo_high_ranges_t *high = (ngx_http_geo_high_ranges_t *) data;
+
+    in_addr_t              addr;
+    ngx_uint_t             i, n;
+    struct sockaddr_in    *sin;
+    ngx_http_geo_range_t  *range;
+
+    ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                   "http geo started");
+
+    sin = (struct sockaddr_in *) r->connection->sockaddr;
+
+    *v = *high->default_value;
+
+    addr = ntohl(sin->sin_addr.s_addr);
+
+    range = high->low[addr >> 16].ranges;
+
+    n = addr & 0xffff;
+
+    for (i = 0; i < high->low[addr >> 16].n; i++) {
+        if (n >= (ngx_uint_t) range[i].start
+            && n <= (ngx_uint_t) range[i].end)
+        {
+            *v = *range[i].value;
+        }
+    }
+
+    ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                   "http geo: %V %v", &r->connection->addr_text, v);
+
+    return NGX_OK;
+}
+
+
 static char *
 ngx_http_geo_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
 {
     char                     *rv;
+    size_t                    len;
     ngx_str_t                *value, name;
+    ngx_uint_t                i;
     ngx_conf_t                save;
     ngx_pool_t               *pool;
-    ngx_radix_tree_t         *tree;
+    ngx_array_t              *a;
     ngx_http_variable_t      *var;
     ngx_http_geo_conf_ctx_t   ctx;
 
@@ -122,24 +196,21 @@
         return NGX_CONF_ERROR;
     }
 
-    tree = ngx_radix_tree_create(cf->pool, -1);
-
-    if (tree == NULL) {
+    pool = ngx_create_pool(16384, cf->log);
+    if (pool == NULL) {
         return NGX_CONF_ERROR;
     }
 
-    var->get_handler = ngx_http_geo_variable;
-    var->data = (uintptr_t) tree;
-
-    pool = ngx_create_pool(16384, cf->log);
-    if (pool == NULL) {
+    ctx.temp_pool = ngx_create_pool(16384, cf->log);
+    if (ctx.temp_pool == NULL) {
         return NGX_CONF_ERROR;
     }
 
     ngx_rbtree_init(&ctx.rbtree, &ctx.sentinel,
                     ngx_http_variable_value_rbtree_insert);
 
-    ctx.tree = tree;
+    ctx.high = NULL;
+    ctx.tree = NULL;
     ctx.pool = cf->pool;
 
     save = *cf;
@@ -152,112 +223,451 @@
 
     *cf = save;
 
-    ngx_destroy_pool(pool);
+    if (ctx.high) {
 
-    if (ngx_radix32tree_find(tree, 0) != NGX_RADIX_NO_VALUE) {
-        return rv;
-    }
+        for (i = 0; i < 0x10000; i++) {
+            a = (ngx_array_t *) ctx.high->low[i].ranges;
 
-    if (ngx_radix32tree_insert(tree, 0, 0,
-                               (uintptr_t) &ngx_http_variable_null_value)
-        == NGX_ERROR)
-    {
-        return NGX_CONF_ERROR;
+            if (a == NULL || a->nelts == 0) {
+                continue;
+            }
+
+            ctx.high->low[i].n = a->nelts;
+
+            len = a->nelts * sizeof(ngx_http_geo_range_t);
+
+            ctx.high->low[i].ranges = ngx_palloc(cf->pool, len);
+            if (ctx.high->low[i].ranges == NULL ){
+                return NGX_CONF_ERROR;
+            }
+
+            ngx_memcpy(ctx.high->low[i].ranges, a->elts, len);
+        }
+
+        var->get_handler = ngx_http_geo_range_variable;
+        var->data = (uintptr_t) ctx.high;
+
+        ngx_destroy_pool(ctx.temp_pool);
+        ngx_destroy_pool(pool);
+
+        if (ctx.high->default_value == NULL) {
+            ctx.high->default_value = &ngx_http_variable_null_value;
+        }
+
+    } else {
+        var->get_handler = ngx_http_geo_cidr_variable;
+        var->data = (uintptr_t) ctx.tree;
+
+        ngx_destroy_pool(ctx.temp_pool);
+        ngx_destroy_pool(pool);
+
+        if (ngx_radix32tree_find(ctx.tree, 0) != NGX_RADIX_NO_VALUE) {
+            return rv;
+        }
+
+        if (ngx_radix32tree_insert(ctx.tree, 0, 0,
+                                   (uintptr_t) &ngx_http_variable_null_value)
+            == NGX_ERROR)
+        {
+            return NGX_CONF_ERROR;
+        }
     }
 
     return rv;
 }
 
 
-/* AF_INET only */
-
 static char *
 ngx_http_geo(ngx_conf_t *cf, ngx_command_t *dummy, void *conf)
 {
-    uint32_t                         hash;
-    ngx_int_t                        rc;
-    ngx_str_t                       *value, file;
-    ngx_uint_t                       i;
-    ngx_inet_cidr_t                  cidrin;
-    ngx_http_geo_conf_ctx_t         *ctx;
-    ngx_http_variable_value_t       *val, *old;
-    ngx_http_variable_value_node_t  *vvn;
+    char                     *rv;
+    ngx_str_t                *value, file;
+    ngx_http_geo_conf_ctx_t  *ctx;
 
     ctx = cf->ctx;
 
+    value = cf->args->elts;
+
+    if (cf->args->nelts == 1) {
+
+        if (ngx_strcmp(value[0].data, "ranges") == 0) {
+
+            if (ctx->tree) {
+                ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                                   "the \"ranges\" directive must be "
+                                   "the first directive inside \"geo\" block");
+                goto failed;
+            }
+
+            ctx->high = ngx_pcalloc(ctx->pool,
+                                    sizeof(ngx_http_geo_high_ranges_t));
+            if (ctx->high == NULL) {
+                goto failed;
+            }
+
+            rv = NGX_CONF_OK;
+
+            goto done;
+        }
+    }
+
     if (cf->args->nelts != 2) {
         ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                            "invalid number of the geo parameters");
-        return NGX_CONF_ERROR;
+        goto failed;
     }
 
-    value = cf->args->elts;
-
     if (ngx_strcmp(value[0].data, "include") == 0) {
-        file = value[1];
 
-        if (ngx_conf_full_name(cf->cycle, &file, 1) == NGX_ERROR){
-            return NGX_CONF_ERROR;
+        file.len = value[1].len++;
+
+        file.data = ngx_pstrdup(ctx->temp_pool, &value[1]);
+        if (file.data == NULL) {
+            goto failed;
+        }
+
+        if (ngx_conf_full_name(cf->cycle, &file, 1) != NGX_OK){
+            goto failed;
         }
 
         ngx_log_debug1(NGX_LOG_DEBUG_CORE, cf->log, 0, "include %s", file.data);
 
-        return ngx_conf_parse(cf, &file);
+        rv = ngx_conf_parse(cf, &file);
+
+        goto done;
+    }
+
+    if (ctx->high) {
+        rv = ngx_http_geo_range(cf, ctx, value);
+
+    } else {
+        rv = ngx_http_geo_cidr(cf, ctx, value);
+    }
+
+done:
+
+    ngx_reset_pool(cf->pool);
+
+    return rv;
+
+failed:
+
+    ngx_reset_pool(cf->pool);
+
+    return NGX_CONF_ERROR;
+}
+
+
+static char *
+ngx_http_geo_range(ngx_conf_t *cf, ngx_http_geo_conf_ctx_t *ctx,
+    ngx_str_t *value)
+{
+    u_char                     *p, *last;
+    in_addr_t                   start, end;
+    ngx_str_t                  *net;
+    ngx_uint_t                  del;
+    ngx_http_variable_value_t  *old;
+
+    if (ngx_strcmp(value[0].data, "default") == 0) {
+
+        old = ctx->high->default_value;
+
+        ctx->high->default_value = ngx_http_geo_value(cf, ctx, &value[1]);
+        if (ctx->high->default_value == NULL) {
+            return NGX_CONF_ERROR;
+        }
+
+        if (old) {
+            ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
+                    "duplicate range \"%V\", value: \"%v\", old value: \"%v\"",
+                    &value[0], ctx->high->default_value, old);
+        }
+
+        return NGX_CONF_OK;
+    }
+
+    if (ngx_strcmp(value[0].data, "delete") == 0) {
+        net = &value[1];
+        del = 1;
+
+    } else {
+        net = &value[0];
+        del = 0;
+    }
+
+    last = net->data + net->len;
+
+    p = ngx_strlchr(net->data, last, '-');
+
+    if (p == NULL) {
+        goto invalid;
+    }
+
+    start = ngx_inet_addr(net->data, p - net->data);
+
+    if (start == INADDR_NONE) {
+        goto invalid;
+    }
+
+    start = ntohl(start);
+
+    p++;
+
+    end = ngx_inet_addr(p, last - p);
+
+    if (end == INADDR_NONE) {
+        goto invalid;
+    }
+
+    end = ntohl(end);
+
+    if (start > end) {
+        goto invalid;
+    }
+
+    if (del) {
+        if (ngx_http_geo_delete_range(cf, ctx, start, end)) {
+            ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
+                               "no address range \"%V\" to delete", net);
+        }
+
+        return NGX_CONF_OK;
+    }
+
+    ctx->value = ngx_http_geo_value(cf, ctx, &value[1]);
+
+    if (ctx->value == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    ctx->net = net;
+
+    return ngx_http_geo_add_range(cf, ctx, start, end);
+
+invalid:
+
+    ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid range \"%V\"", net);
+
+    return NGX_CONF_ERROR;
+}
+
+
+/* the add procedure is optimized to add a growing up sequence */
+
+static char *
+ngx_http_geo_add_range(ngx_conf_t *cf, ngx_http_geo_conf_ctx_t *ctx,
+    in_addr_t start, in_addr_t end)
+{
+    in_addr_t              n;
+    ngx_uint_t             h, i, s, e;
+    ngx_array_t           *a;
+    ngx_http_geo_range_t  *range;
+
+    for (n = start; n < end; n += 0x10000) {
+
+        h = n >> 16;
+        s = n & 0xffff;
+
+        if ((n | 0xffff) > end) {
+            e = end & 0xffff;
+
+        } else {
+            e = 0xffff;
+        }
+
+        a = (ngx_array_t *) ctx->high->low[h].ranges;
+
+        if (a == NULL) {
+            a = ngx_array_create(ctx->temp_pool, 64,
+                                 sizeof(ngx_http_geo_range_t));
+            if (a == NULL) {
+                return NGX_CONF_ERROR;
+            }
+
+            ctx->high->low[h].ranges = (ngx_http_geo_range_t *) a;
+        }
+
+        i = a->nelts;
+        range = a->elts;
+
+        while (i) {
+
+            i--;
+
+            if (e < (ngx_uint_t) range[i].start) {
+                continue;
+            }
+
+            if (s > (ngx_uint_t) range[i].end) {
+
+                /* add after the range */
+
+                range = ngx_array_push(a);
+                if (range == NULL) {
+                    return NGX_CONF_ERROR;
+                }
+
+                range = a->elts;
+
+                ngx_memcpy(&range[i + 2], &range[i + 1],
+                           (a->nelts - 2 - i) * sizeof(ngx_http_geo_range_t));
+
+                range = &range[i + 1];
+
+                goto next;
+            }
+
+            if (s == (ngx_uint_t) range[i].start
+                && e == (ngx_uint_t) range[i].end)
+            {
+                ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
+                    "duplicate range \"%V\", value: \"%v\", old value: \"%v\"",
+                    ctx->net, ctx->value, range[i].value);
+                continue;
+            }
+
+            ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
+                               "overlapped range \"%V\"", ctx->net);
+
+            return NGX_CONF_ERROR;
+        }
+
+        /* add the first range */
+
+        range = ngx_array_push(a);
+        if (range == NULL) {
+            return NGX_CONF_ERROR;
+        }
+
+    next:
+
+        range->start = (u_short) s;
+        range->end = (u_short) e;
+        range->value = ctx->value;
+    }
+
+    return NGX_CONF_OK;
+}
+
+
+static ngx_uint_t
+ngx_http_geo_delete_range(ngx_conf_t *cf, ngx_http_geo_conf_ctx_t *ctx,
+    in_addr_t start, in_addr_t end)
+{
+    in_addr_t              n;
+    ngx_uint_t             h, i, s, e, warn;
+    ngx_array_t           *a;
+    ngx_http_geo_range_t  *range;
+
+    warn = 0;
+
+    for (n = start; n < end; n += 0x10000) {
+
+        h = n >> 16;
+        s = n & 0xffff;
+
+        if ((n | 0xffff) > end) {
+            e = end & 0xffff;
+
+        } else {
+            e = 0xffff;
+        }
+
+        a = (ngx_array_t *) ctx->high->low[h].ranges;
+
+        if (a == NULL) {
+            warn = 1;
+            continue;
+        }
+
+        range = a->elts;
+        for (i = 0; i < a->nelts; i++) {
+
+            if (s == (ngx_uint_t) range[i].start
+                && e == (ngx_uint_t) range[i].end)
+            {
+                ngx_memcpy(&range[i], &range[i + 1],
+                           (a->nelts - 1 - i) * sizeof(ngx_http_geo_range_t));
+                break;
+            }
+
+            if (s != (ngx_uint_t) range[i].start
+                && e != (ngx_uint_t) range[i].end)
+            {
+                continue;
+            }
+
+            warn = 1;
+        }
+    }
+
+    return warn;
+}
+
+
+static char *
+ngx_http_geo_cidr(ngx_conf_t *cf, ngx_http_geo_conf_ctx_t *ctx,
+    ngx_str_t *value)
+{
+    ngx_int_t                        rc, del;
+    ngx_str_t                       *net;
+    ngx_uint_t                       i;
+    ngx_inet_cidr_t                  cidrin;
+    ngx_http_variable_value_t       *val, *old;
+
+    if (ctx->tree == NULL) {
+        ctx->tree = ngx_radix_tree_create(ctx->pool, -1);
+        if (ctx->tree == NULL) {
+            return NGX_CONF_ERROR;
+        }
     }
 
     if (ngx_strcmp(value[0].data, "default") == 0) {
         cidrin.addr = 0;
         cidrin.mask = 0;
+        net = &value[0];
 
     } else {
-        rc = ngx_ptocidr(&value[0], &cidrin);
+        if (ngx_strcmp(value[0].data, "delete") == 0) {
+            net = &value[1];
+            del = 1;
+
+        } else {
+            net = &value[0];
+            del = 0;
+        }
+
+        rc = ngx_ptocidr(net, &cidrin);
 
         if (rc == NGX_ERROR) {
             ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
-                               "invalid parameter \"%V\"", &value[0]);
+                               "invalid network \"%V\"", net);
             return NGX_CONF_ERROR;
         }
 
         if (rc == NGX_DONE) {
             ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
-                               "low address bits of %V are meaningless",
-                               &value[0]);
+                               "low address bits of %V are meaningless", net);
         }
 
         cidrin.addr = ntohl(cidrin.addr);
         cidrin.mask = ntohl(cidrin.mask);
+
+        if (del) {
+            if (ngx_radix32tree_delete(ctx->tree, cidrin.addr, cidrin.mask)
+                != NGX_OK)
+            {
+                ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
+                                   "no network \"%V\" to delete", net);
+                return NGX_CONF_OK;
+            }
+        }
     }
 
-    hash = ngx_crc32_long(value[1].data, value[1].len);
-
-    val = ngx_http_variable_value_lookup(&ctx->rbtree, &value[1], hash);
+    val = ngx_http_geo_value(cf, ctx, &value[1]);
 
     if (val == NULL) {
-        val = ngx_palloc(ctx->pool, sizeof(ngx_http_variable_value_t));
-        if (val == NULL) {
-            return NGX_CONF_ERROR;
-        }
-
-        val->len = value[1].len;
-        val->data = ngx_pstrdup(ctx->pool, &value[1]);
-        if (val->data == NULL) {
-            return NGX_CONF_ERROR;
-        }
-
-        val->valid = 1;
-        val->no_cacheable = 0;
-        val->not_found = 0;
-
-        vvn = ngx_palloc(cf->pool, sizeof(ngx_http_variable_value_node_t));
-        if (vvn == NULL) {
-            return NGX_CONF_ERROR;
-        }
-
-        vvn->node.key = hash;
-        vvn->len = val->len;
-        vvn->value = val;
-
-        ngx_rbtree_insert(&ctx->rbtree, &vvn->node);
+        return NGX_CONF_ERROR;
     }
 
     for (i = 2; i; i--) {
@@ -274,18 +684,65 @@
         /* rc == NGX_BUSY */
 
         old  = (ngx_http_variable_value_t *)
-                    ngx_radix32tree_find(ctx->tree, cidrin.addr & cidrin.mask);
+                   ngx_radix32tree_find(ctx->tree, cidrin.addr & cidrin.mask);
 
         ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
-                "duplicate parameter \"%V\", value: \"%v\", old value: \"%v\"",
-                &value[0], val, old);
+                "duplicate network \"%V\", value: \"%v\", old value: \"%v\"",
+                net, val, old);
 
         rc = ngx_radix32tree_delete(ctx->tree, cidrin.addr, cidrin.mask);
 
         if (rc == NGX_ERROR) {
+            ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "invalid radix tree");
             return NGX_CONF_ERROR;
         }
     }
 
     return NGX_CONF_ERROR;
 }
+
+
+static ngx_http_variable_value_t *
+ngx_http_geo_value(ngx_conf_t *cf, ngx_http_geo_conf_ctx_t *ctx,
+    ngx_str_t *value)
+{
+    uint32_t                         hash;
+    ngx_http_variable_value_t       *val;
+    ngx_http_variable_value_node_t  *vvn;
+
+    hash = ngx_crc32_long(value->data, value->len);
+
+    val = ngx_http_variable_value_lookup(&ctx->rbtree, value, hash);
+
+    if (val) {
+        return val;
+    }
+
+    val = ngx_palloc(ctx->pool, sizeof(ngx_http_variable_value_t));
+    if (val == NULL) {
+        return NULL;
+    }
+
+    val->len = value->len;
+    val->data = ngx_pstrdup(ctx->pool, value);
+    if (val->data == NULL) {
+        return NULL;
+    }
+
+    val->valid = 1;
+    val->no_cacheable = 0;
+    val->not_found = 0;
+
+    vvn = ngx_palloc(ctx->temp_pool, sizeof(ngx_http_variable_value_node_t));
+    if (vvn == NULL) {
+        return NULL;
+    }
+
+    vvn->node.key = hash;
+    vvn->len = val->len;
+    vvn->value = val;
+
+    ngx_rbtree_insert(&ctx->rbtree, &vvn->node);
+
+    return val;
+}