diff --git a/backend/internal/ip_ranges.js b/backend/internal/ip_ranges.js
index edf5c3a..40e63ea 100644
--- a/backend/internal/ip_ranges.js
+++ b/backend/internal/ip_ranges.js
@@ -9,6 +9,9 @@ const CLOUDFRONT_URL   = 'https://ip-ranges.amazonaws.com/ip-ranges.json';
 const CLOUDFARE_V4_URL = 'https://www.cloudflare.com/ips-v4';
 const CLOUDFARE_V6_URL = 'https://www.cloudflare.com/ips-v6';
 
+const regIpV4 = /^(\d+\.?){4}\/\d+/;
+const regIpV6 = /^(([\da-fA-F]+)?:)+\/\d+/;
+
 const internalIpRanges = {
 
 	interval_timeout:    1000 * 60 * 60 * 6, // 6 hours
@@ -74,14 +77,14 @@ const internalIpRanges = {
 					return internalIpRanges.fetchUrl(CLOUDFARE_V4_URL);
 				})
 				.then((cloudfare_data) => {
-					let items = cloudfare_data.split('\n');
+					let items = cloudfare_data.split('\n').filter((line) => regIpV4.test(line));
 					ip_ranges = [... ip_ranges, ... items];
 				})
 				.then(() => {
 					return internalIpRanges.fetchUrl(CLOUDFARE_V6_URL);
 				})
 				.then((cloudfare_data) => {
-					let items = cloudfare_data.split('\n');
+					let items = cloudfare_data.split('\n').filter((line) => regIpV6.test(line));
 					ip_ranges = [... ip_ranges, ... items];
 				})
 				.then(() => {