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DNS lookup

Everything DNS says about a domain: traced from the root servers down, every record type asked of the domain's own nameservers, each nameserver checked, then every hostname and policy record it points at followed, with SPF, DMARC, DKIM and DNSSEC checked along the way.

Try example.com, gmail.com, www.github.com, dnssec-failed.org, 1.1.1.1. A URL, e-mail address or IP address works too.

2401:b180:4100::15

5.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.4.0.8.1.b.1.0.4.2.ip6.arpa

Zone 0.8.1.b.1.0.4.2.ip6.arpa27 queries in 1.9 s2026-11-09 06:13:03 UTC

WHOIS for 2401:b180:4100::15 →TextJSON
  • Problem 5.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.4.0.8.1.b.1.0.4.2.ip6.arpa doesn't exist (NXDOMAIN from 0.8.1.b.1.0.4.2.ip6.arpa's nameservers).

Resolution trace

  1. .asked g.root-servers.net 192.112.36.425 ms

    Referral to ip6.arpa. signed (3 DS)

    • c.ip6-servers.arpa 196.216.169.11 2001:43f8:110::11
    • b.ip6-servers.arpa 199.253.182.182 2001:500:86::86
    • a.ip6-servers.arpa 199.180.182.53 2620:37:e000::53
    • f.ip6-servers.arpa 193.0.9.2 2a13:27c0:30::2
    • e.ip6-servers.arpa 203.119.86.101 2001:dd8:6::101
    • d.ip6-servers.arpa 200.7.86.53 2001:13c7:7012::53

    192.33.4.12 failed: NOERROR

  2. ip6.arpa.asked b.ip6-servers.arpa 199.253.182.1825.8 ms

    Referral to 0.4.2.ip6.arpa. signed (1 DS)

    • ns1.apnic.net 203.119.42.53 2001:dd8:e::53
    • ns2.apnic.net 203.119.95.53 2001:ddd::53
    • ns3.lacnic.net 200.3.13.14 2001:13c7:7002:3000::14
    • apnic.authdns.ripe.net 193.0.9.9 2a13:27c0:30::9
    • rirns.arin.net 199.253.249.53 2620:38:2000::53

    No glue for ns1.apnic.net, ns2.apnic.net, ns3.lacnic.net, apnic.authdns.ripe.net, rirns.arin.net: addresses looked up via a resolver.

  3. 0.4.2.ip6.arpa.asked rirns.arin.net 199.253.249.5390 ms

    Referral to 0.8.1.b.1.0.4.2.ip6.arpa. unsigned delegation

    • rdns1.alidns.com 140.205.122.253 2401:b180:4100::14
    • rdns2.alidns.com 140.205.122.243 2401:b180:4100::15

    No glue for rdns1.alidns.com, rdns2.alidns.com: addresses looked up via a resolver.

  4. 0.8.1.b.1.0.4.2.ip6.arpa.asked rdns1.alidns.com 140.205.122.2536.2 ms

    NXDOMAIN: this name does not exist.

Public resolvers

What four public resolvers answer right now, from their caches. Highlighted values differ from the authoritative answer: either a recent change they haven't picked up yet (the TTL says how long until they do), or, for A and AAAA, a CDN or geo-routed site handing each resolver location its own addresses.

ResolverPTR
Cloudflare 1.1.1.1NXDOMAIN
Google 8.8.8.8NXDOMAIN
Quad9 9.9.9.9NXDOMAIN
OpenDNS 208.67.222.222NXDOMAIN

Text dump

; DNS report for 5.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.4.0.8.1.b.1.0.4.2.ip6.arpa (2401:b180:4100::15)
; 2026-11-09 06:13:03 UTC, 27 queries in 1.90 s, zone 0.8.1.b.1.0.4.2.ip6.arpa

;; FINDINGS
;  [ERROR] 5.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.4.0.8.1.b.1.0.4.2.ip6.arpa doesn't exist (NXDOMAIN from 0.8.1.b.1.0.4.2.ip6.arpa's nameservers).

;; TRACE
;  5.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.1.4.0.8.1.b.1.0.4.2.ip6.arpa PTR
;  . @g.root-servers.net (192.112.36.4) 25 ms [NOERROR qr]: referral to ip6.arpa.
ip6.arpa.		NS	c.ip6-servers.arpa.	; 196.216.169.11 2001:43f8:110::11
ip6.arpa.		NS	b.ip6-servers.arpa.	; 199.253.182.182 2001:500:86::86
ip6.arpa.		NS	a.ip6-servers.arpa.	; 199.180.182.53 2620:37:e000::53
ip6.arpa.		NS	f.ip6-servers.arpa.	; 193.0.9.2 2a13:27c0:30::2
ip6.arpa.		NS	e.ip6-servers.arpa.	; 203.119.86.101 2001:dd8:6::101
ip6.arpa.		NS	d.ip6-servers.arpa.	; 200.7.86.53 2001:13c7:7012::53
ip6.arpa.	86400	IN	DS	13880 8 2 068554EFCB5861F42AF93EF8E79C442A86C16FC5652E6B6D2419ED527F344D17
ip6.arpa.	86400	IN	DS	64060 8 2 8A11501086330132BE2C23F22DEDF0634AD5FF668B4AA1988E172C6A2A4E5F7B
ip6.arpa.	86400	IN	DS	45094 8 2 E6B54E0A20CE1EDBFCB6879C02F5782059CECB043A31D804A04AFA51AF01D5FB
;  ip6.arpa. @b.ip6-servers.arpa (199.253.182.182) 5.8 ms [NOERROR qr]: referral to 0.4.2.ip6.arpa.
0.4.2.ip6.arpa.		NS	ns1.apnic.net.	; 203.119.42.53 2001:dd8:e::53
0.4.2.ip6.arpa.		NS	ns2.apnic.net.	; 203.119.95.53 2001:ddd::53
0.4.2.ip6.arpa.		NS	ns3.lacnic.net.	; 200.3.13.14 2001:13c7:7002:3000::14
0.4.2.ip6.arpa.		NS	apnic.authdns.ripe.net.	; 193.0.9.9 2a13:27c0:30::9
0.4.2.ip6.arpa.		NS	rirns.arin.net.	; 199.253.249.53 2620:38:2000::53
0.4.2.ip6.arpa.	86400	IN	DS	31428 13 2 D5E6321CEA5D39F8BC181D94FCB4538AB93C719932E25CE7ABBF635C6B332F6B
;  0.4.2.ip6.arpa. @rirns.arin.net (199.253.249.53) 90 ms [NOERROR qr]: referral to 0.8.1.b.1.0.4.2.ip6.arpa.
0.8.1.b.1.0.4.2.ip6.arpa.		NS	rdns1.alidns.com.	; 140.205.122.253 2401:b180:4100::14
0.8.1.b.1.0.4.2.ip6.arpa.		NS	rdns2.alidns.com.	; 140.205.122.243 2401:b180:4100::15
;  0.8.1.b.1.0.4.2.ip6.arpa. @rdns1.alidns.com (140.205.122.253) 6.2 ms [NXDOMAIN qr aa]: NXDOMAIN

;; PUBLIC RESOLVERS
;  Cloudflare PTR   NXDOMAIN
;  Google     PTR   NXDOMAIN
;  Quad9      PTR   NXDOMAIN
;  OpenDNS    PTR   NXDOMAIN