diff --git a/scripts/base/utils/site.bro b/scripts/base/utils/site.bro
index b8414a7a84..96fc46ec56 100644
--- a/scripts/base/utils/site.bro
+++ b/scripts/base/utils/site.bro
@@ -16,6 +16,10 @@ export {
 
 	## Networks that are considered "local".
 	const local_nets: set[subnet] &redef;
+	
+	## This is used for mapping between local networks and string
+	## values for the CIDRs represented.
+	global local_nets_table: table[subnet] of string = {};
 
 	## Networks that are considered "neighbors".
 	const neighbor_nets: set[subnet] &redef;
@@ -138,4 +142,9 @@ event bro_init() &priority=10
 	# Double backslashes are needed due to string parsing.
 	local_dns_suffix_regex = set_to_regex(local_zones, "(^\\.?|\\.)(~~)$");
 	local_dns_neighbor_suffix_regex = set_to_regex(neighbor_zones, "(^\\.?|\\.)(~~)$");
+
+	# Create the local_nets mapping table.
+	for ( cidr in Site::local_nets )
+		local_nets_table[cidr] = fmt("%s", cidr);
+
 	}