🛡️ Nameserver Resilience

Domains whose DNS hangs on a single nameserver, address, network or AS · all insights

DNS should never hang on one server. This page counts the .dk domains whose nameservers share a single host, address, network or autonomous system, the single points of failure that turn one outage into a dead domain. Data comes from our own scanners, which re-resolve every .dk domain in the zone roughly once a week.

🛡️ Single points of failure

1,186,285 working delegations with resolvable nameservers (lame excluded)
Every nameserver is on…DomainsShareWhy it matters
A single nameserver host1470.01%Any outage or mistake on that host takes the domain offline; RFC 1034 asks for at least two.
A single nameserver address1,3030.11%Several NS names, but they all resolve to one IP, so they are really one server.
One IPv4 /24 and no IPv610,7740.91%All nameservers share one network: a routing problem there takes them all down.
One autonomous system758,93564.0%Common and usually fine with a large provider, but one network outage still takes all nameservers down.
No IPv6 nameserver85,7527.2%IPv6-only resolvers cannot reach the zone.

Click a row to list its domains (computed 2026-10-01 14:22).

📋 One autonomous system

758,935 domains
DomainNameservers and addresses
5rmarketing.dkDNS01.mhhosting.dk 188.180.76.248 AS3292
DNS02.mhhosting.dk 188.180.76.244 AS3292
DNS03.mhhosting.dk 80.63.220.2 AS3292
5rpeople.dkns1.curanet.dk 185.25.141.12 AS48854, 2a02:2339:4006:108::123 AS48854
ns2.curanet.dk 2a02:2339:1:10f::123:123 AS48854, 91.197.248.75 AS48854
5rytmer.dkns1.123hotel.dk 185.25.141.12 AS48854, 2a02:2339:4006:108::123 AS48854
ns2.123hotel.dk 2a02:2339:1:10f::123:123 AS48854, 91.197.248.75 AS48854
5sekunder.dkns1.simply.com 2a02:2339:1:15c::4562:4562 AS48854, 91.197.248.78 AS48854
ns2.simply.com 185.25.141.15 AS48854, 2a02:2339:4006:101::4562:4562 AS48854
ns3.simply.com 91.197.248.79 AS48854
5skole.dkcrystal.ns.cloudflare.com 108.162.194.202 AS13335, 162.159.38.202 AS13335, 172.64.34.202 AS13335, 2606:4700:50::a29f:26ca AS13335, 2803:f800:50::6ca2:c2ca AS13335, 2a06:98c1:50::ac40:22ca AS13335
hugh.ns.cloudflare.com 108.162.193.117 AS13335, 172.64.33.117 AS13335, 173.245.59.117 AS13335, 2606:4700:58::adf5:3b75 AS13335, 2803:f800:50::6ca2:c175 AS13335, 2a06:98c1:50::ac40:2175 AS13335
5smiles.dkns1.simply.com 2a02:2339:1:15c::4562:4562 AS48854, 91.197.248.78 AS48854
ns2.simply.com 185.25.141.15 AS48854, 2a02:2339:4006:101::4562:4562 AS48854
ns3.simply.com 91.197.248.79 AS48854
ns4.simply.com 91.197.248.80 AS48854
5sogne.dkns1.curanet.dk 185.25.141.12 AS48854, 2a02:2339:4006:108::123 AS48854
ns2.curanet.dk 2a02:2339:1:10f::123:123 AS48854, 91.197.248.75 AS48854
5spor.dkns1.simply.com 2a02:2339:1:15c::4562:4562 AS48854, 91.197.248.78 AS48854
ns2.simply.com 185.25.141.15 AS48854, 2a02:2339:4006:101::4562:4562 AS48854
ns3.simply.com 91.197.248.79 AS48854
5star.dkns.dandomain.dk 185.25.141.3 AS48854, 2a02:2339:4006:109::dd AS48854
ns2.dandomain.dk 2a02:2339:1:108::dd:dd AS48854, 91.197.248.66 AS48854
5starauto.dkns1.simply.com 2a02:2339:1:15c::4562:4562 AS48854, 91.197.248.78 AS48854
ns2.simply.com 185.25.141.15 AS48854, 2a02:2339:4006:101::4562:4562 AS48854
ns3.simply.com 91.197.248.79 AS48854
ns4.simply.com 91.197.248.80 AS48854
5starpedel.dkns1.simply.com 2a02:2339:1:15c::4562:4562 AS48854, 91.197.248.78 AS48854
ns2.simply.com 185.25.141.15 AS48854, 2a02:2339:4006:101::4562:4562 AS48854
ns3.simply.com 91.197.248.79 AS48854
5starvillaholidays.dkns61.domaincontrol.com 2603:5:2153::20 AS44273, 97.74.101.32 AS44273
ns62.domaincontrol.com 173.201.69.32 AS44273, 2603:5:2253::20 AS44273
5stjerner.dkgabriella.ns.cloudflare.com 108.162.194.134 AS13335, 162.159.38.134 AS13335, 172.64.34.134 AS13335, 2606:4700:50::a29f:2686 AS13335, 2803:f800:50::6ca2:c286 AS13335, 2a06:98c1:50::ac40:2286 AS13335
mitch.ns.cloudflare.com 108.162.193.208 AS13335, 172.64.33.208 AS13335, 173.245.59.208 AS13335, 2606:4700:58::adf5:3bd0 AS13335, 2803:f800:50::6ca2:c1d0 AS13335, 2a06:98c1:50::ac40:21d0 AS13335
5stjernet.dkns1.simply.com 2a02:2339:1:15c::4562:4562 AS48854, 91.197.248.78 AS48854
ns2.simply.com 185.25.141.15 AS48854, 2a02:2339:4006:101::4562:4562 AS48854
ns3.simply.com 91.197.248.79 AS48854
ns4.simply.com 91.197.248.80 AS48854
5stjernetrengoring.dkns1.simply.com 2a02:2339:1:15c::4562:4562 AS48854, 91.197.248.78 AS48854
ns2.simply.com 185.25.141.15 AS48854, 2a02:2339:4006:101::4562:4562 AS48854
ns3.simply.com 91.197.248.79 AS48854
ns4.simply.com 91.197.248.80 AS48854
5stjernetservice.dkcandy.ns.cloudflare.com 108.162.192.79 AS13335, 172.64.32.79 AS13335, 173.245.58.79 AS13335, 2606:4700:50::adf5:3a4f AS13335, 2803:f800:50::6ca2:c04f AS13335, 2a06:98c1:50::ac40:204f AS13335
kurt.ns.cloudflare.com 108.162.193.193 AS13335, 172.64.33.193 AS13335, 173.245.59.193 AS13335, 2606:4700:58::adf5:3bc1 AS13335, 2803:f800:50::6ca2:c1c1 AS13335, 2a06:98c1:50::ac40:21c1 AS13335
5styrker.dkns.dandomain.dk 185.25.141.3 AS48854, 2a02:2339:4006:109::dd AS48854
ns2.dandomain.dk 2a02:2339:1:108::dd:dd AS48854, 91.197.248.66 AS48854
5t.dkns1.simply.com 2a02:2339:1:15c::4562:4562 AS48854, 91.197.248.78 AS48854
ns2.simply.com 185.25.141.15 AS48854, 2a02:2339:4006:101::4562:4562 AS48854
ns3.simply.com 91.197.248.79 AS48854
5taarnsmotion.dkns4.dns-123.net 35.198.132.83 AS396982
ns5.dns-123.net 35.187.184.173 AS396982
ns6.dns-123.net 35.228.54.1 AS396982
5tel.dkns1.dlx.dk 2a00:1b18:1337:1337::53 AS47527, 46.30.121.210 AS47527
ns2.dlx.dk 185.208.212.124 AS47527, 2a00:1b19:1337:1337::53 AS47527
5tested.dkns1.curanet.dk 185.25.141.12 AS48854, 2a02:2339:4006:108::123 AS48854
ns2.curanet.dk 2a02:2339:1:10f::123:123 AS48854, 91.197.248.75 AS48854
5th-avenue.dkns-100-a.gandi.net 173.246.100.101 AS209453, 2001:4b98:aaaa::65 AS209453
ns-168-b.gandi.net 2001:4b98:aaab::a9 AS209453, 213.167.230.169 AS209453
ns-202-c.gandi.net 217.70.187.203 AS209453, 2604:3400:aaac::cb AS209453
5th.dkkanye.ns.cloudflare.com 108.162.193.189 AS13335, 172.64.33.189 AS13335, 173.245.59.189 AS13335, 2606:4700:58::adf5:3bbd AS13335, 2803:f800:50::6ca2:c1bd AS13335, 2a06:98c1:50::ac40:21bd AS13335
lila.ns.cloudflare.com 108.162.192.186 AS13335, 172.64.32.186 AS13335, 173.245.58.186 AS13335, 2606:4700:50::adf5:3aba AS13335, 2803:f800:50::6ca2:c0ba AS13335, 2a06:98c1:50::ac40:20ba AS13335
5thavenue.dkns.dandomain.dk 185.25.141.3 AS48854, 2a02:2339:4006:109::dd AS48854
ns2.dandomain.dk 2a02:2339:1:108::dd:dd AS48854, 91.197.248.66 AS48854
5thelement.dkns61.domaincontrol.com 2603:5:2153::20 AS44273, 97.74.101.32 AS44273
ns62.domaincontrol.com 173.201.69.32 AS44273, 2603:5:2253::20 AS44273
5thule100.dkns.dandomain.dk 185.25.141.3 AS48854, 2a02:2339:4006:109::dd AS48854
ns2.dandomain.dk 2a02:2339:1:108::dd:dd AS48854, 91.197.248.66 AS48854
5u.dkns1.simply.com 2a02:2339:1:15c::4562:4562 AS48854, 91.197.248.78 AS48854
ns2.simply.com 185.25.141.15 AS48854, 2a02:2339:4006:101::4562:4562 AS48854
ns3.simply.com 91.197.248.79 AS48854
ns4.simply.com 91.197.248.80 AS48854
5um.dkns1.curanet.dk 185.25.141.12 AS48854, 2a02:2339:4006:108::123 AS48854
ns2.curanet.dk 2a02:2339:1:10f::123:123 AS48854, 91.197.248.75 AS48854
5v.dkdawn.ns.cloudflare.com 108.162.192.106 AS13335, 172.64.32.106 AS13335, 173.245.58.106 AS13335, 2606:4700:50::adf5:3a6a AS13335, 2803:f800:50::6ca2:c06a AS13335, 2a06:98c1:50::ac40:206a AS13335
will.ns.cloudflare.com 108.162.193.149 AS13335, 172.64.33.149 AS13335, 173.245.59.149 AS13335, 2606:4700:58::adf5:3b95 AS13335, 2803:f800:50::6ca2:c195 AS13335, 2a06:98c1:50::ac40:2195 AS13335
5venner.dkphil.ns.cloudflare.com 108.162.193.137 AS13335, 172.64.33.137 AS13335, 173.245.59.137 AS13335, 2606:4700:58::adf5:3b89 AS13335, 2803:f800:50::6ca2:c189 AS13335, 2a06:98c1:50::ac40:2189 AS13335
zoe.ns.cloudflare.com 108.162.192.149 AS13335, 172.64.32.149 AS13335, 173.245.58.149 AS13335, 2606:4700:50::adf5:3a95 AS13335, 2803:f800:50::6ca2:c095 AS13335, 2a06:98c1:50::ac40:2095 AS13335
5w.dkns1.simply.com 2a02:2339:1:15c::4562:4562 AS48854, 91.197.248.78 AS48854
ns2.simply.com 185.25.141.15 AS48854, 2a02:2339:4006:101::4562:4562 AS48854
ns3.simply.com 91.197.248.79 AS48854
5x5.dkns1.nordicway.dk 2a01:4f8:1c1a:a1e7::1 AS24940, 91.98.140.195 AS24940
ns2.nordicway.dk 2a01:4f8:c012:4db6::1 AS24940, 49.13.80.249 AS24940
ns3.nordicway.dk 2a01:4f8:c2c:d3c0::1 AS24940, 78.47.45.64 AS24940
ns4.nordicway.dk 2a01:4f8:c010:24a2::1 AS24940, 78.47.56.84 AS24940
5x5stafet.dkns.dandomain.dk 185.25.141.3 AS48854, 2a02:2339:4006:109::dd AS48854
ns2.dandomain.dk 2a02:2339:1:108::dd:dd AS48854, 91.197.248.66 AS48854
5xb.dkns1.simply.com 2a02:2339:1:15c::4562:4562 AS48854, 91.197.248.78 AS48854
ns2.simply.com 185.25.141.15 AS48854, 2a02:2339:4006:101::4562:4562 AS48854
ns3.simply.com 91.197.248.79 AS48854
5xchristensen.dkns1.simply.com 2a02:2339:1:15c::4562:4562 AS48854, 91.197.248.78 AS48854
ns2.simply.com 185.25.141.15 AS48854, 2a02:2339:4006:101::4562:4562 AS48854
ns3.simply.com 91.197.248.79 AS48854
ns4.simply.com 91.197.248.80 AS48854
5xdalgaard.dkns1.simply.com 2a02:2339:1:15c::4562:4562 AS48854, 91.197.248.78 AS48854
ns2.simply.com 185.25.141.15 AS48854, 2a02:2339:4006:101::4562:4562 AS48854
ns3.simply.com 91.197.248.79 AS48854
ns4.simply.com 91.197.248.80 AS48854
5xhjordt.dkns4.dns-123.net 35.198.132.83 AS396982
ns5.dns-123.net 35.187.184.173 AS396982
ns6.dns-123.net 35.228.54.1 AS396982
5xlorentzen.dkns1.onwelcom.dk 185.51.79.241 AS205984
ns2.onwelcom.dk 185.51.79.251 AS205984
5xm.dkns1.simply.com 2a02:2339:1:15c::4562:4562 AS48854, 91.197.248.78 AS48854
ns2.simply.com 185.25.141.15 AS48854, 2a02:2339:4006:101::4562:4562 AS48854
ns3.simply.com 91.197.248.79 AS48854
ns4.simply.com 91.197.248.80 AS48854
5xma.dkns.scannet2.dk 185.25.141.9 AS48854, 2a02:2339:4006:10d::4171:4171 AS48854
ns2.scannet2.dk 2a02:2339:1:112:0:5:1:b11 AS48854, 91.197.248.72 AS48854
5xnielsen.dkns1.simply.com 2a02:2339:1:15c::4562:4562 AS48854, 91.197.248.78 AS48854
ns2.simply.com 185.25.141.15 AS48854, 2a02:2339:4006:101::4562:4562 AS48854
ns3.simply.com 91.197.248.79 AS48854
ns4.simply.com 91.197.248.80 AS48854
5xpersson.dkns.dandomain.dk 185.25.141.3 AS48854, 2a02:2339:4006:109::dd AS48854
ns2.dandomain.dk 2a02:2339:1:108::dd:dd AS48854, 91.197.248.66 AS48854
5xrunge.dkns1.simply.com 2a02:2339:1:15c::4562:4562 AS48854, 91.197.248.78 AS48854
ns2.simply.com 185.25.141.15 AS48854, 2a02:2339:4006:101::4562:4562 AS48854
ns3.simply.com 91.197.248.79 AS48854
ns4.simply.com 91.197.248.80 AS48854
5y.dkns1.simply.com 2a02:2339:1:15c::4562:4562 AS48854, 91.197.248.78 AS48854
ns2.simply.com 185.25.141.15 AS48854, 2a02:2339:4006:101::4562:4562 AS48854
ns3.simply.com 91.197.248.79 AS48854
5z.dkns1.dlx.dk 2a00:1b18:1337:1337::53 AS47527, 46.30.121.210 AS47527
ns2.dlx.dk 185.208.212.124 AS47527, 2a00:1b19:1337:1337::53 AS47527
6-10.dkns.dandomain.dk 185.25.141.3 AS48854, 2a02:2339:4006:109::dd AS48854
ns2.dandomain.dk 2a02:2339:1:108::dd:dd AS48854, 91.197.248.66 AS48854
6-7sundby.dkns.dandomain.dk 185.25.141.3 AS48854, 2a02:2339:4006:109::dd AS48854
ns2.dandomain.dk 2a02:2339:1:108::dd:dd AS48854, 91.197.248.66 AS48854
6-arenaer.dkns1.wordpress.com 198.181.116.9 AS2635, 2a04:fa87:ffff::c6b5:7409 AS2635
ns2.wordpress.com 198.181.117.9 AS2635, 2a04:fa87:ffff::c6b5:7509 AS2635
ns3.wordpress.com 192.0.74.9 AS2635, 2620:115:c00f::c000:4a09 AS2635
6-arenas.dkns1.wordpress.com 198.181.116.9 AS2635, 2a04:fa87:ffff::c6b5:7409 AS2635
ns2.wordpress.com 198.181.117.9 AS2635, 2a04:fa87:ffff::c6b5:7509 AS2635
ns3.wordpress.com 192.0.74.9 AS2635, 2620:115:c00f::c000:4a09 AS2635
6-dages.dkeric.ns.cloudflare.com 108.162.193.112 AS13335, 172.64.33.112 AS13335, 173.245.59.112 AS13335, 2606:4700:58::adf5:3b70 AS13335, 2803:f800:50::6ca2:c170 AS13335, 2a06:98c1:50::ac40:2170 AS13335
nia.ns.cloudflare.com 108.162.192.210 AS13335, 172.64.32.210 AS13335, 173.245.58.210 AS13335, 2606:4700:50::adf5:3ad2 AS13335, 2803:f800:50::6ca2:c0d2 AS13335, 2a06:98c1:50::ac40:20d2 AS13335
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