🛡️ 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

1,185,859 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 address1,3060.11%Several NS names, but they all resolve to one IP, so they are really one server.
One IPv4 /24 and no IPv610,7960.91%All nameservers share one network: a routing problem there takes them all down.
One autonomous system758,38264.0%Common and usually fine with a large provider, but one network outage still takes all nameservers down.
No IPv6 nameserver85,8087.2%IPv6-only resolvers cannot reach the zone.

Click a row to list its domains (computed 2026-10-01 08:10).

📋 One autonomous system

758,382 domains
DomainNameservers and addresses
4enp.dkns1.dns-parking.com 162.159.24.201 AS13335, 2400:cb00:2049:1::a29f:18c9 AS13335
ns2.dns-parking.com 162.159.25.42 AS13335, 2400:cb00:2049:1::a29f:192a AS13335
4euplus.dkcuce.ruk.cuni.cz 195.113.0.8 AS2852, 2001:718:1e03:1::8 AS2852
david.ruk.cuni.cz 2001:718:1203:502::2 AS2852, 78.128.213.242 AS2852
golias.ruk.cuni.cz 195.113.0.2 AS2852, 2001:718:1e03:1::2 AS2852
4everpaws.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
4everwellness.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
4evr.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
4f.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
4family.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
4feetunder.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
4feldborg.dkns3.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
4ff.dkns01.is.nl 213.75.63.33 AS1136, 2a02:a47f:ac:1::1153 AS1136
ns02.is.nl 213.75.63.68 AS1136, 2a02:a47f:ac:1::1253 AS1136
ns03.is.nl 213.75.63.34 AS1136, 2a02:a47f:ac:1::1353 AS1136
ns13.kpn.net 213.75.63.34 AS1136, 2a02:a47f:ac:1::1353 AS1136
ns3.kpn.net 194.151.228.42 AS1136, 2a02:a47f:ac:1::353 AS1136
4fire.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
4firms.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
4fitnessfreaks.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
4food.dkns1.vevida.net 2a00:f60::29 AS48635, 77.94.248.29 AS48635
ns2.vevida.net 2a00:f60::31 AS48635, 77.94.248.31 AS48635
ns3.vevida.com 2a00:f60::30 AS48635, 77.94.248.30 AS48635
4forestillingen.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
4friends.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
4fun.dkns1.siteground.net 75.2.77.104 AS16509
ns2.siteground.net 99.83.229.113 AS16509
4fund.dkdns104.ovh.net 2001:41d0:d00:fe00::2 AS16276, 5.196.39.113 AS16276
ns104.ovh.net 2001:41d0:b00:f800::2 AS16276, 5.135.60.17 AS16276
4funkyflavours.dkns01.is.nl 213.75.63.33 AS1136, 2a02:a47f:ac:1::1153 AS1136
ns02.is.nl 213.75.63.68 AS1136, 2a02:a47f:ac:1::1253 AS1136
ns03.is.nl 213.75.63.34 AS1136, 2a02:a47f:ac:1::1353 AS1136
ns13.kpn.net 213.75.63.34 AS1136, 2a02:a47f:ac:1::1353 AS1136
ns3.kpn.net 194.151.228.42 AS1136, 2a02:a47f:ac:1::353 AS1136
4funmusik.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
4g.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
4gaarde.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
4gamers.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
4garn-skål.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
4garnskål.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
4gclinical.dkns-141-a.gandi.net 173.246.100.142 AS209453, 2001:4b98:aaaa::8e AS209453
ns-229-b.gandi.net 2001:4b98:aaab::e6 AS209453, 213.167.230.230 AS209453
ns-50-c.gandi.net 217.70.187.51 AS209453, 2604:3400:aaac::33 AS209453
4gdh.dkns1.aau.dk 130.225.52.5 AS1835, 2001:878:300:1::5 AS1835
ns2.aau.dk 130.225.54.5 AS1835, 2001:878:300:100::5 AS1835
4gmobiltbredbaand.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
4grader.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
4graph.dkns1.ispapi.net 194.50.187.134 AS1921, 2a04:2b00:14cc::4 AS1921
ns2.ispapi.net 194.0.182.1 AS1921, 2a04:2b00:14dd::4 AS1921
ns3.ispapi.net 193.227.117.124 AS1921, 2a04:2b00:14ee::4 AS1921
4groupsonly.dkns1.eurodns.com 199.167.66.107 AS23393, 2610:1c8:b002::107 AS23393
ns2.eurodns.com 104.37.178.107 AS23393, 2610:1c8:b001::107 AS23393
ns3.eurodns.com 199.167.66.108 AS23393, 2610:1c8:b002::108 AS23393
ns4.eurodns.com 104.37.178.108 AS23393, 2610:1c8:b001::108 AS23393
4gs.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
4h-akademi.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
4h-akademiet.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
4h-app.dkart.ns.cloudflare.com 108.162.193.102 AS13335, 172.64.33.102 AS13335, 173.245.59.102 AS13335, 2606:4700:58::adf5:3b66 AS13335, 2803:f800:50::6ca2:c166 AS13335, 2a06:98c1:50::ac40:2166 AS13335
tess.ns.cloudflare.com 108.162.192.227 AS13335, 172.64.32.227 AS13335, 173.245.58.227 AS13335, 2606:4700:50::adf5:3ae3 AS13335, 2803:f800:50::6ca2:c0e3 AS13335, 2a06:98c1:50::ac40:20e3 AS13335
4h-vvs.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
4h.dkpns41.cloudns.net 185.136.96.79 AS203391, 2a06:fb00:1::1:79 AS203391
pns42.cloudns.net 185.136.97.79 AS203391, 2a06:fb00:1::2:79 AS203391
pns43.cloudns.net 185.136.98.79 AS203391, 2a06:fb00:1::3:79 AS203391
pns44.cloudns.net 185.136.99.79 AS203391, 2a06:fb00:1::4:79 AS203391
4handscleaning.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
4hdanmark.dkpns41.cloudns.net 185.136.96.79 AS203391, 2a06:fb00:1::1:79 AS203391
pns42.cloudns.net 185.136.97.79 AS203391, 2a06:fb00:1::2:79 AS203391
pns43.cloudns.net 185.136.98.79 AS203391, 2a06:fb00:1::3:79 AS203391
pns44.cloudns.net 185.136.99.79 AS203391, 2a06:fb00:1::4:79 AS203391
4hdm.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
4heast.dkbethany.ns.cloudflare.com 108.162.194.31 AS13335, 162.159.38.31 AS13335, 172.64.34.31 AS13335, 2606:4700:50::a29f:261f AS13335, 2803:f800:50::6ca2:c21f AS13335, 2a06:98c1:50::ac40:221f AS13335
ganz.ns.cloudflare.com 108.162.195.40 AS13335, 162.159.44.40 AS13335, 172.64.35.40 AS13335, 2606:4700:58::a29f:2c28 AS13335, 2803:f800:50::6ca2:c328 AS13335, 2a06:98c1:50::ac40:2328 AS13335
4heaven.dkns3.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
4heroes.dkns1.podi.dk 185.25.141.12 AS48854, 2a02:2339:4006:108::123 AS48854
ns2.podi.dk 2a02:2339:1:10f::123:123 AS48854, 91.197.248.75 AS48854
4hjulet.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
4hjulscross.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
4hoeje.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
4hoest.dknoel.ns.cloudflare.com 108.162.193.216 AS13335, 172.64.33.216 AS13335, 173.245.59.216 AS13335, 2606:4700:58::adf5:3bd8 AS13335, 2803:f800:50::6ca2:c1d8 AS13335, 2a06:98c1:50::ac40:21d8 AS13335
ulla.ns.cloudflare.com 108.162.192.233 AS13335, 172.64.32.233 AS13335, 173.245.58.233 AS13335, 2606:4700:50::adf5:3ae9 AS13335, 2803:f800:50::6ca2:c0e9 AS13335, 2a06:98c1:50::ac40:20e9 AS13335
4hoje.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
4home.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
4horse.dkns3.webhot.dk 178.72.21.249 AS3342
ns4.webhot.dk 178.72.21.250 AS3342
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