diff --git a/dns.go b/dns.go
index 809334d..d4724ad 100644
--- a/dns.go
+++ b/dns.go
@@ -52,7 +52,7 @@ var dns_servers = []*DNSServer{
 	&DNSServer{"delegation", "burble", "b.delegation-servers.dn42", 4, "172.20.129.1:53", 0},
 	&DNSServer{"delegation", "burble", "b.delegation-servers.dn42", 6, "[fd42:4242:2601:ac53::1]:53", 0},
 	&DNSServer{"delegation", "jrb0001", "j.delegation-servers.dn42", 4, "172.20.1.18:53", 0},
-	&DNSServer{"delegation", "jrb0001", "j.delegation-servers.dn42", 6, "[fd42:5d71:219:0:1::42]:53", 0},
+	&DNSServer{"delegation", "jrb0001", "j.delegation-servers.dn42", 6, "[fd42:5d71:219:0:a526:d935:281e:22d6]:53", 0},
 	&DNSServer{"delegation", "yamakaja", "y.delegation-servers.dn42", 4, "172.20.20.66:53", 0},
 	&DNSServer{"delegation", "yamakaja", "y.delegation-servers.dn42", 6, "[fd42:c01d:beef::3]:53", 0},
 	&DNSServer{"recursive", "yamakaja", "a.recursive-servers.dn42", 4, "172.20.0.53:53", 0},
@@ -60,7 +60,7 @@ var dns_servers = []*DNSServer{
 	&DNSServer{"recursive", "burble", "b.recursive-servers.dn42", 4, "172.20.129.2:53", 0},
 	&DNSServer{"recursive", "burble", "b.recursive-servers.dn42", 6, "[fd42:4242:2601:ac53::53]:53", 0},
 	&DNSServer{"recursive", "jrb0001", "j.recursive-servers.dn42", 4, "172.20.1.19:53", 0},
-	&DNSServer{"recursive", "jrb0001", "j.recursive-servers.dn42", 6, "[fd42:5d71:219:0:1::43]:53", 0},
+	&DNSServer{"recursive", "jrb0001", "j.recursive-servers.dn42", 6, "[fd42:5d71:219:0:69c2:2b0e:17e8:c215]:53", 0},
 	&DNSServer{"recursive", "yamakaja", "y.recursive-servers.dn42", 4, "172.20.20.65:53", 0},
 	&DNSServer{"recursive", "yamakaja", "y.recursive-servers.dn42", 6, "[fd42:c01d:beef::2]:53", 0},
 	&DNSServer{"burble.dn42", "burble", "fr-rbx1", 6, "[fd42:4242:2601:36::ac:53]:53", 0},
@@ -175,11 +175,16 @@ func (m *DNSMetrics) Collect() {
 
 			// assume not
 			valid = 1
-			for _, soa := range masters {
-				if server.soa == soa {
-					// match was found
-					valid = 0
-					break
+
+			// automatically invalid if out of date
+			if (now - server.soa) < (3600 * 25) {
+				// otherwise step through each 'master' and check the SOA matches somewhere
+				for _, soa := range masters {
+					if server.soa == soa {
+						// match was found
+						valid = 0
+						break
+					}
 				}
 			}