Made in / Donate

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.

2001:502:4612::1

1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.1.6.4.2.0.5.0.1.0.0.2.ip6.arpa

Zone 2.1.6.4.2.0.5.0.1.0.0.2.ip6.arpa120 queries in 0.9 s2026-11-09 06:03:18 UTCNot DNSSEC-signed

WHOIS for 2001:502:4612::1 →TextJSON
  • Warning The parent zone delegates to udns1.ultradns.net, udns2.ultradns.net but 2.1.6.4.2.0.5.0.1.0.0.2.ip6.arpa itself lists pdns1.ultradns.net, pdns2.ultradns.net, pdns3.ultradns.org, pdns4.ultradns.org, pdns5.ultradns.info, pdns6.ultradns.co.uk. Make the two lists match.
  • Note 2.1.6.4.2.0.5.0.1.0.0.2.ip6.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

Records

Asked directly of pdns2.ultradns.net (204.74.109.1), an authoritative server: no cache in between, so these are the live values.

PTR Reverse pointer

259200PTRpdns4.ultradns.org.
ANY query: refused politely (RFC 8482)
3600HINFO"RFC8482" ""

No records of type A, AAAA, CNAME, DNAME, NS, SOA, MX, TXT, CAA, HTTPS, SVCB, SRV, NAPTR, DS, DNSKEY, CDS, CDNSKEY, NSEC3PARAM, TLSA, SSHFP, LOC, HINFO, RP, URI, SPF, OPENPGPKEY, ZONEMD, CSYNC.

Resolution trace

  1. .asked i.root-servers.net 192.36.148.176.8 ms

    Referral to ip6.arpa. signed (3 DS)

    • b.ip6-servers.arpa 199.253.182.182 2001:500:86::86
    • d.ip6-servers.arpa 200.7.86.53 2001:13c7:7012::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
    • c.ip6-servers.arpa 196.216.169.11 2001:43f8:110::11
    • a.ip6-servers.arpa 199.180.182.53 2620:37:e000::53

    193.0.14.129 failed: NOERROR

  2. ip6.arpa.asked f.ip6-servers.arpa 193.0.9.211 ms

    Referral to 5.0.1.0.0.2.ip6.arpa. signed (1 DS)

    • r.arin.net 199.180.180.63 2001:500:f0::63
    • u.arin.net 204.61.216.50 2001:500:14:6050:ad::1
    • x.arin.net 199.180.180.63 2001:500:f0::63
    • y.arin.net 192.82.134.30 2001:500:127::30
    • z.arin.net 199.180.180.63 2001:500:f0::63
    • arin.authdns.ripe.net 193.0.9.10 2a13:27c0:30::10

    No glue for r.arin.net, u.arin.net, x.arin.net, y.arin.net, z.arin.net, arin.authdns.ripe.net: addresses looked up via a resolver.

    196.216.169.11 failed: NOERROR

  3. 5.0.1.0.0.2.ip6.arpa.asked y.arin.net 192.82.134.306.8 ms

    Referral to 2.1.6.4.2.0.5.0.1.0.0.2.ip6.arpa. unsigned delegation

    • udns2.ultradns.net 204.74.101.1 2610:a1:1014::d
    • udns1.ultradns.net 204.69.234.1 2001:502:f3ff::d

    No glue for udns2.ultradns.net, udns1.ultradns.net: addresses looked up via a resolver.

  4. 2.1.6.4.2.0.5.0.1.0.0.2.ip6.arpa.asked udns1.ultradns.net 204.69.234.15.7 ms

    Answer (authoritative):

    1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.1.6.4.2.0.5.0.1.0.0.2.ip6.arpa.259200PTRpdns4.ultradns.org.

    204.74.101.1 failed: NOERROR

Nameservers

Every address of every nameserver, asked for 2.1.6.4.2.0.5.0.1.0.0.2.ip6.arpa's SOA. "Parent" means the 5.0.1.0.0.2.ip6.arpa zone delegates to it; "zone" means 2.1.6.4.2.0.5.0.1.0.0.2.ip6.arpa lists it itself.

NameserverListed inAddressStatusSerialTime
pdns1.ultradns.netzone204.74.108.1authoritative20130318506.3 ms
2001:502:f3ff::1authoritative20130318506.5 ms
pdns2.ultradns.netzone204.74.109.1authoritative20130318506.2 ms
2610:a1:1014::1authoritative20130318506.7 ms
pdns3.ultradns.orgzone199.7.68.1authoritative20130318506.8 ms
2610:a1:1015::1authoritative20130318507.0 ms
pdns4.ultradns.orgzone199.7.69.1authoritative201303185029 ms
2001:502:4612::1authoritative201303185029 ms
pdns5.ultradns.infozone204.74.114.1authoritative20130318506.5 ms
2610:a1:1016::1authoritative20130318506.8 ms
pdns6.ultradns.co.ukzone204.74.115.1authoritative201303185016 ms
2610:a1:1017::1authoritative201303185017 ms
udns1.ultradns.netparent204.69.234.1 glueauthoritative20130318506.8 ms
2001:502:f3ff::d glueauthoritative20130318507.0 ms
udns2.ultradns.netparent204.74.101.1 glueauthoritative201303185029 ms
2610:a1:1014::d glueauthoritative20130318507.1 ms

DNSSEC

2.1.6.4.2.0.5.0.1.0.0.2.ip6.arpa isn't signed: no DS at the parent and no DNSKEY in the zone.

Hosts and reverse DNS

Every hostname the records point at, resolved to its addresses; each address's PTR (reverse DNS), with ✓ where the PTR name resolves back to the same address.

HostAddressReverse DNS (PTR)
pdns1.ultradns.net
nameserver
204.74.108.1pdns1.ultradns.net ✓
2001:502:f3ff::1pdns1.ultradns.net ✓
pdns2.ultradns.net
nameserver
204.74.109.1pdns2.ultradns.net ✓
2610:a1:1014::1pdns2.ultradns.net ✓
pdns3.ultradns.org
nameserver
199.7.68.1pdns3.ultradns.org ✓
2610:a1:1015::1pdns3.ultradns.org ✓
pdns4.ultradns.org
nameserver · PTR target
199.7.69.1pdns4.ultradns.org ✓
2001:502:4612::1pdns4.ultradns.org ✓
pdns5.ultradns.info
nameserver
204.74.114.1pdns5.ultradns.info ✓
2610:a1:1016::1pdns5.ultradns.info ✓
pdns6.ultradns.co.uk
nameserver
204.74.115.1pdns6.ultradns.co.uk ✓
2610:a1:1017::1pdns6.ultradns.co.uk ✓
udns1.ultradns.net
nameserver
204.69.234.1udns1.ultradns.net ✓
2001:502:f3ff::dudns1.ultradns.net ✓
udns2.ultradns.net
nameserver
204.74.101.1udns2.ultradns.net ✓
2610:a1:1014::dudns2.ultradns.net ✓

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 1.1.1.1pdns4.ultradns.org.
TTL 259198
Google 8.8.8.8pdns4.ultradns.org.
TTL 21600
Quad9 9.9.9.9pdns4.ultradns.org.
TTL 43200
OpenDNS 208.67.222.222pdns4.ultradns.org.
TTL 259200

Text dump

; DNS report for 1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.1.6.4.2.0.5.0.1.0.0.2.ip6.arpa (2001:502:4612::1)
; 2026-11-09 06:03:18 UTC, 120 queries in 0.88 s, zone 2.1.6.4.2.0.5.0.1.0.0.2.ip6.arpa

;; FINDINGS
;  [WARN] The parent zone delegates to udns1.ultradns.net, udns2.ultradns.net but 2.1.6.4.2.0.5.0.1.0.0.2.ip6.arpa itself lists pdns1.ultradns.net, pdns2.ultradns.net, pdns3.ultradns.org, pdns4.ultradns.org, pdns5.ultradns.info, pdns6.ultradns.co.uk. Make the two lists match.
;  [INFO] 2.1.6.4.2.0.5.0.1.0.0.2.ip6.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

;; RECORDS (authoritative, from pdns2.ultradns.net (204.74.109.1))
1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.1.6.4.2.0.5.0.1.0.0.2.ip6.arpa.	259200	IN	PTR	pdns4.ultradns.org.

;; TRACE
;  1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.1.6.4.2.0.5.0.1.0.0.2.ip6.arpa PTR
;  . @i.root-servers.net (192.36.148.17) 6.8 ms [NOERROR qr]: referral to ip6.arpa.
ip6.arpa.		NS	b.ip6-servers.arpa.	; 199.253.182.182 2001:500:86::86
ip6.arpa.		NS	d.ip6-servers.arpa.	; 200.7.86.53 2001:13c7:7012::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	c.ip6-servers.arpa.	; 196.216.169.11 2001:43f8:110::11
ip6.arpa.		NS	a.ip6-servers.arpa.	; 199.180.182.53 2620:37:e000::53
ip6.arpa.	86400	IN	DS	64060 8 2 8A11501086330132BE2C23F22DEDF0634AD5FF668B4AA1988E172C6A2A4E5F7B
ip6.arpa.	86400	IN	DS	13880 8 2 068554EFCB5861F42AF93EF8E79C442A86C16FC5652E6B6D2419ED527F344D17
ip6.arpa.	86400	IN	DS	45094 8 2 E6B54E0A20CE1EDBFCB6879C02F5782059CECB043A31D804A04AFA51AF01D5FB
;  ip6.arpa. @f.ip6-servers.arpa (193.0.9.2) 11 ms [NOERROR qr]: referral to 5.0.1.0.0.2.ip6.arpa.
5.0.1.0.0.2.ip6.arpa.		NS	r.arin.net.	; 199.180.180.63 2001:500:f0::63
5.0.1.0.0.2.ip6.arpa.		NS	u.arin.net.	; 204.61.216.50 2001:500:14:6050:ad::1
5.0.1.0.0.2.ip6.arpa.		NS	x.arin.net.	; 199.180.180.63 2001:500:f0::63
5.0.1.0.0.2.ip6.arpa.		NS	y.arin.net.	; 192.82.134.30 2001:500:127::30
5.0.1.0.0.2.ip6.arpa.		NS	z.arin.net.	; 199.180.180.63 2001:500:f0::63
5.0.1.0.0.2.ip6.arpa.		NS	arin.authdns.ripe.net.	; 193.0.9.10 2a13:27c0:30::10
5.0.1.0.0.2.ip6.arpa.	86400	IN	DS	54676 8 2 FC5F72BAB09F5AC9A30AF8B3B83230A54AE80D0130C2793AF4297C7E4E9D32C1
;  5.0.1.0.0.2.ip6.arpa. @y.arin.net (192.82.134.30) 6.8 ms [NOERROR qr]: referral to 2.1.6.4.2.0.5.0.1.0.0.2.ip6.arpa.
2.1.6.4.2.0.5.0.1.0.0.2.ip6.arpa.		NS	udns2.ultradns.net.	; 204.74.101.1 2610:a1:1014::d
2.1.6.4.2.0.5.0.1.0.0.2.ip6.arpa.		NS	udns1.ultradns.net.	; 204.69.234.1 2001:502:f3ff::d
;  2.1.6.4.2.0.5.0.1.0.0.2.ip6.arpa. @udns1.ultradns.net (204.69.234.1) 5.7 ms [NOERROR qr aa]: answer
1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.1.6.4.2.0.5.0.1.0.0.2.ip6.arpa.	259200	IN	PTR	pdns4.ultradns.org.

;; NAMESERVERS (SOA asked of each address)
;  pdns1.ultradns.net [zone]
;    204.74.108.1                            ok                        2013031850  6.3 ms
;    2001:502:f3ff::1                        ok                        2013031850  6.5 ms
;  pdns2.ultradns.net [zone]
;    204.74.109.1                            ok                        2013031850  6.2 ms
;    2610:a1:1014::1                         ok                        2013031850  6.7 ms
;  pdns3.ultradns.org [zone]
;    199.7.68.1                              ok                        2013031850  6.8 ms
;    2610:a1:1015::1                         ok                        2013031850  7.0 ms
;  pdns4.ultradns.org [zone]
;    199.7.69.1                              ok                        2013031850  29 ms
;    2001:502:4612::1                        ok                        2013031850  29 ms
;  pdns5.ultradns.info [zone]
;    204.74.114.1                            ok                        2013031850  6.5 ms
;    2610:a1:1016::1                         ok                        2013031850  6.8 ms
;  pdns6.ultradns.co.uk [zone]
;    204.74.115.1                            ok                        2013031850  16 ms
;    2610:a1:1017::1                         ok                        2013031850  17 ms
;  udns1.ultradns.net [parent]
;    204.69.234.1                            ok                        2013031850  6.8 ms
;    2001:502:f3ff::d                        ok                        2013031850  7.0 ms
;  udns2.ultradns.net [parent]
;    204.74.101.1                            ok                        2013031850  29 ms
;    2610:a1:1014::d                         ok                        2013031850  7.1 ms

;; DNSSEC: unsigned

;; HOSTS
;  pdns1.ultradns.net (nameserver)
;    204.74.108.1                            PTR pdns1.ultradns.net (confirmed)
;    2001:502:f3ff::1                        PTR pdns1.ultradns.net (confirmed)
;  pdns2.ultradns.net (nameserver)
;    204.74.109.1                            PTR pdns2.ultradns.net (confirmed)
;    2610:a1:1014::1                         PTR pdns2.ultradns.net (confirmed)
;  pdns3.ultradns.org (nameserver)
;    199.7.68.1                              PTR pdns3.ultradns.org (confirmed)
;    2610:a1:1015::1                         PTR pdns3.ultradns.org (confirmed)
;  pdns4.ultradns.org (nameserver; PTR target)
;    199.7.69.1                              PTR pdns4.ultradns.org (confirmed)
;    2001:502:4612::1                        PTR pdns4.ultradns.org (confirmed)
;  pdns5.ultradns.info (nameserver)
;    204.74.114.1                            PTR pdns5.ultradns.info (confirmed)
;    2610:a1:1016::1                         PTR pdns5.ultradns.info (confirmed)
;  pdns6.ultradns.co.uk (nameserver)
;    204.74.115.1                            PTR pdns6.ultradns.co.uk (confirmed)
;    2610:a1:1017::1                         PTR pdns6.ultradns.co.uk (confirmed)
;  udns1.ultradns.net (nameserver)
;    204.69.234.1                            PTR udns1.ultradns.net (confirmed)
;    2001:502:f3ff::d                        PTR udns1.ultradns.net (confirmed)
;  udns2.ultradns.net (nameserver)
;    204.74.101.1                            PTR udns2.ultradns.net (confirmed)
;    2610:a1:1014::d                         PTR udns2.ultradns.net (confirmed)

;; PUBLIC RESOLVERS
;  Cloudflare PTR   pdns4.ultradns.org.  ttl 259198
;  Google     PTR   pdns4.ultradns.org.  ttl 21600
;  Quad9      PTR   pdns4.ultradns.org.  ttl 43200
;  OpenDNS    PTR   pdns4.ultradns.org.  ttl 259200