🛡️ 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

1,183,321 working delegations with resolvable nameservers (lame excluded)
Every nameserver is on…DomainsShareWhy it matters
A single nameserver host1520.01%Any outage or mistake on that host takes the domain offline; RFC 1034 asks for at least two.
A single nameserver address1,3100.11%Several NS names, but they all resolve to one IP, so they are really one server.
One IPv4 /24 and no IPv610,6870.90%All nameservers share one network: a routing problem there takes them all down.
One autonomous system757,79364.0%Common and usually fine with a large provider, but one network outage still takes all nameservers down.
No IPv6 nameserver85,3377.2%IPv6-only resolvers cannot reach the zone.

Click a row to list its domains (computed 2026-10-03 22:50).

📋 One autonomous system

757,793 domains
DomainNameservers and addresses
aarestrup-executive.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
aarestrup-planteskole.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
aarestrup-vind.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
aarestrup.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
aarestrupbang.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
aarestrupbogtrykkeri.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
aarestrupbyg.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
aarestrupforsamlingshus.dkbarbara.ns.cloudflare.com 108.162.192.248 AS13335, 172.64.32.248 AS13335, 173.245.58.248 AS13335, 2606:4700:50::adf5:3af8 AS13335, 2803:f800:50::6ca2:c0f8 AS13335, 2a06:98c1:50::ac40:20f8 AS13335
justin.ns.cloudflare.com 108.162.193.187 AS13335, 172.64.33.187 AS13335, 173.245.59.187 AS13335, 2606:4700:58::adf5:3bbb AS13335, 2803:f800:50::6ca2:c1bb AS13335, 2a06:98c1:50::ac40:21bb AS13335
aarestrupgaard.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
aarestrupplanteskole.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
aarestrupvand.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
aaret-i-lejerbo.dkbrian.ns.cloudflare.com 108.162.195.36 AS13335, 162.159.44.36 AS13335, 172.64.35.36 AS13335, 2606:4700:58::a29f:2c24 AS13335, 2803:f800:50::6ca2:c324 AS13335, 2a06:98c1:50::ac40:2324 AS13335
harlee.ns.cloudflare.com 108.162.194.238 AS13335, 162.159.38.238 AS13335, 172.64.34.238 AS13335, 2606:4700:50::a29f:26ee AS13335, 2803:f800:50::6ca2:c2ee AS13335, 2a06:98c1:50::ac40:22ee AS13335
aaretpaabredsten.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
aaretrundt.dkcloe.ns.cloudflare.com 108.162.192.86 AS13335, 172.64.32.86 AS13335, 173.245.58.86 AS13335, 2606:4700:50::adf5:3a56 AS13335, 2803:f800:50::6ca2:c056 AS13335, 2a06:98c1:50::ac40:2056 AS13335
sri.ns.cloudflare.com 108.162.193.234 AS13335, 172.64.33.234 AS13335, 173.245.59.234 AS13335, 2606:4700:58::adf5:3bea AS13335, 2803:f800:50::6ca2:c1ea AS13335, 2a06:98c1:50::ac40:21ea AS13335
aarets-ciso.dkns1.wwi.dk 208.94.148.4 AS16552, 2600:1800:10::1 AS16552
ns2.wwi.dk 208.80.124.4 AS16552, 2600:1801:11::1 AS16552
ns3.wwi.as 208.80.126.4 AS16552, 2600:1802:12::1 AS16552
ns4.wwi.eu 208.80.125.4 AS16552, 2600:1801:13::1 AS16552
aarets-ejerleder.dkns1.oneoffice.dk 185.25.141.12 AS48854, 2a02:2339:4006:108::123 AS48854
ns2.oneoffice.dk 2a02:2339:1:10f::123:123 AS48854, 91.197.248.75 AS48854
aarets-jesper.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
aarets-reumert.dkns1.simpleagencygroup.dk 185.25.141.12 AS48854, 2a02:2339:4006:108::123 AS48854
ns2.simpleagencygroup.dk 2a02:2339:1:10f::123:123 AS48854, 91.197.248.75 AS48854
aarets-smv.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
aaretsarbejdsplads.dkjay.ns.cloudflare.com 108.162.193.123 AS13335, 172.64.33.123 AS13335, 173.245.59.123 AS13335, 2606:4700:58::adf5:3b7b AS13335, 2803:f800:50::6ca2:c17b AS13335, 2a06:98c1:50::ac40:217b AS13335
uma.ns.cloudflare.com 108.162.192.146 AS13335, 172.64.32.146 AS13335, 173.245.58.146 AS13335, 2606:4700:50::adf5:3a92 AS13335, 2803:f800:50::6ca2:c092 AS13335, 2a06:98c1:50::ac40:2092 AS13335
aaretsautogenbruger.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
aaretsautolakerer.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
aaretsbager.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
aaretsband.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
aaretsbil.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
aaretsbilforhandler.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
aaretsbilmaerke.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
aaretsboerneord.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
aaretsborneord.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
aaretsbrugtvognsforhandler.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
aaretsbæredygtighedspris.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
aaretschef.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
aaretscio.dkns1.wwi.dk 208.94.148.4 AS16552, 2600:1800:10::1 AS16552
ns2.wwi.dk 208.80.124.4 AS16552, 2600:1801:11::1 AS16552
ns3.wwi.as 208.80.126.4 AS16552, 2600:1802:12::1 AS16552
ns4.wwi.eu 208.80.125.4 AS16552, 2600:1801:13::1 AS16552
aaretsciso.dkns1.wwi.dk 208.94.148.4 AS16552, 2600:1800:10::1 AS16552
ns2.wwi.dk 208.80.124.4 AS16552, 2600:1801:11::1 AS16552
ns3.wwi.as 208.80.126.4 AS16552, 2600:1802:12::1 AS16552
ns4.wwi.eu 208.80.125.4 AS16552, 2600:1801:13::1 AS16552
aaretsejerleder.dkns1.oneoffice.dk 185.25.141.12 AS48854, 2a02:2339:4006:108::123 AS48854
ns2.oneoffice.dk 2a02:2339:1:10f::123:123 AS48854, 91.197.248.75 AS48854
aaretselbil.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
aaretselbil2024.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
aaretselbil2025.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
aaretselbil2026.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
aaretserhvervsleasingselskab.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
aaretsesbjergenser.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
aaretseventyr.dkanuj.ns.cloudflare.com 108.162.193.65 AS13335, 172.64.33.65 AS13335, 173.245.59.65 AS13335, 2606:4700:58::adf5:3b41 AS13335, 2803:f800:50::6ca2:c141 AS13335, 2a06:98c1:50::ac40:2141 AS13335
kim.ns.cloudflare.com 108.162.192.126 AS13335, 172.64.32.126 AS13335, 173.245.58.126 AS13335, 2606:4700:50::adf5:3a7e AS13335, 2803:f800:50::6ca2:c07e AS13335, 2a06:98c1:50::ac40:207e AS13335
aaretseventyrer.dkanuj.ns.cloudflare.com 108.162.193.65 AS13335, 172.64.33.65 AS13335, 173.245.59.65 AS13335, 2606:4700:58::adf5:3b41 AS13335, 2803:f800:50::6ca2:c141 AS13335, 2a06:98c1:50::ac40:2141 AS13335
kim.ns.cloudflare.com 108.162.192.126 AS13335, 172.64.32.126 AS13335, 173.245.58.126 AS13335, 2606:4700:50::adf5:3a7e AS13335, 2803:f800:50::6ca2:c07e AS13335, 2a06:98c1:50::ac40:207e AS13335
aaretsfamiliebil.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
aaretsfirmabil.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
aaretsformidleraferhvervsleasing.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
aaretsformidlerafprivatleasing.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
aaretsforsikringsselskab.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
aaretsfund.dkns-1307.awsdns-35.org 205.251.197.27 AS16509, 2600:9000:5305:1b00::1 AS16509
ns-155.awsdns-19.com 205.251.192.155 AS16509, 2600:9000:5300:9b00::1 AS16509
ns-1951.awsdns-51.co.uk 205.251.199.159 AS16509, 2600:9000:5307:9f00::1 AS16509
ns-534.awsdns-02.net 205.251.194.22 AS16509, 2600:9000:5302:1600::1 AS16509
aaretshelt.dkns-1371.awsdns-43.org 205.251.197.91 AS16509, 2600:9000:5305:5b00::1 AS16509
ns-1825.awsdns-36.co.uk 205.251.199.33 AS16509, 2600:9000:5307:2100::1 AS16509
ns-384.awsdns-48.com 205.251.193.128 AS16509, 2600:9000:5301:8000::1 AS16509
ns-623.awsdns-13.net 205.251.194.111 AS16509, 2600:9000:5302:6f00::1 AS16509
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