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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.

2404:6800:4000:1027::1b

b.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.7.2.0.1.0.0.0.4.0.0.8.6.4.0.4.2.ip6.arpa

Zone 0.0.8.6.4.0.4.2.ip6.arpa91 queries in 1.5 s2026-11-09 05:25:10 UTCNot DNSSEC-signed

WHOIS for 2404:6800:4000:1027::1b →TextJSON
  • Warning Nameservers disagree on the SOA serial (1016230534 on ns1.google.com; 1016687210 on ns1.google.com, ns2.google.com, ns3.google.com, ns4.google.com). Normal when two DNS providers serve the zone, each numbering its own copy; otherwise some servers haven't picked up the latest change.
  • Note 0.0.8.6.4.0.4.2.ip6.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

Records

Asked directly of ns4.google.com (216.239.38.10), an authoritative server: no cache in between, so these are the live values.

PTR Reverse pointer

3600PTRncboms-in-f27.1e100.net.
ANY query: 1 records
3600PTRncboms-in-f27.1e100.net.

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 a.root-servers.net 198.41.0.412 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
    • a.ip6-servers.arpa 199.180.182.53 2620:37:e000::53
    • c.ip6-servers.arpa 196.216.169.11 2001:43f8:110::11
    • e.ip6-servers.arpa 203.119.86.101 2001:dd8:6::101

    192.33.4.12 failed: NOERROR

  2. ip6.arpa.asked b.ip6-servers.arpa 199.253.182.1826.2 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.

    203.119.86.101 failed: NOERROR

  3. 0.4.2.ip6.arpa.asked apnic.authdns.ripe.net 193.0.9.911 ms

    Referral to 0.0.8.6.4.0.4.2.ip6.arpa. unsigned delegation

    • ns1.google.com 216.239.32.10 2001:4860:4802:32::a
    • ns2.google.com 216.239.34.10 2001:4860:4802:34::a
    • ns3.google.com 216.239.36.10 2001:4860:4802:36::a
    • ns4.google.com 216.239.38.10 2001:4860:4802:38::a

    No glue for ns1.google.com, ns2.google.com, ns3.google.com, ns4.google.com: addresses looked up via a resolver.

    200.3.13.14 failed: NOERROR

  4. 0.0.8.6.4.0.4.2.ip6.arpa.asked ns4.google.com 216.239.38.106.5 ms

    Answer (authoritative):

    b.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.7.2.0.1.0.0.0.4.0.0.8.6.4.0.4.2.ip6.arpa.3600PTRncboms-in-f27.1e100.net.

Nameservers

Every address of every nameserver, asked for 0.0.8.6.4.0.4.2.ip6.arpa's SOA. "Parent" means the 0.4.2.ip6.arpa zone delegates to it; "zone" means 0.0.8.6.4.0.4.2.ip6.arpa lists it itself.

NameserverListed inAddressStatusSerialTime
ns1.google.comparent216.239.32.10 glueauthoritative101623053413 ms
2001:4860:4802:32::a glueauthoritative101668721013 ms
ns2.google.comparent216.239.34.10 glueauthoritative101668721027 ms
2001:4860:4802:34::a glueauthoritative101668721027 ms
ns3.google.comparent216.239.36.10 glueauthoritative101668721013 ms
2001:4860:4802:36::a glueauthoritative101668721012 ms
ns4.google.comparent216.239.38.10 glueauthoritative10166872106.0 ms
2001:4860:4802:38::a glueauthoritative10166872105.8 ms

DNSSEC

0.0.8.6.4.0.4.2.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)
ns1.google.com
nameserver
216.239.32.10ns1.google.com ✓
2001:4860:4802:32::ans1.google.com ✓
ns2.google.com
nameserver
216.239.34.10ns2.google.com ✓
2001:4860:4802:34::ans2.google.com ✓
ns3.google.com
nameserver
216.239.36.10ns3.google.com ✓
2001:4860:4802:36::ans3.google.com ✓
ns4.google.com
nameserver
216.239.38.10ns4.google.com ✓
2001:4860:4802:38::ans4.google.com ✓
ncboms-in-f27.1e100.net
PTR target
192.179.20.27ncboms-in-f27.1e100.net ✓
2404:6800:4000:1027::1bncboms-in-f27.1e100.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 1.1.1.1ncboms-in-f27.1e100.net.
TTL 3600
Google 8.8.8.8ncboms-in-f27.1e100.net.
TTL 1196
Quad9 9.9.9.9ncboms-in-f27.1e100.net.
TTL 3378
OpenDNS 208.67.222.222ncboms-in-f27.1e100.net.
TTL 3600

Text dump

; DNS report for b.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.7.2.0.1.0.0.0.4.0.0.8.6.4.0.4.2.ip6.arpa (2404:6800:4000:1027::1b)
; 2026-11-09 05:25:10 UTC, 91 queries in 1.46 s, zone 0.0.8.6.4.0.4.2.ip6.arpa

;; FINDINGS
;  [WARN] Nameservers disagree on the SOA serial (1016230534 on ns1.google.com; 1016687210 on ns1.google.com, ns2.google.com, ns3.google.com, ns4.google.com). Normal when two DNS providers serve the zone, each numbering its own copy; otherwise some servers haven't picked up the latest change.
;  [INFO] 0.0.8.6.4.0.4.2.ip6.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

;; RECORDS (authoritative, from ns4.google.com (216.239.38.10))
b.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.7.2.0.1.0.0.0.4.0.0.8.6.4.0.4.2.ip6.arpa.	3600	IN	PTR	ncboms-in-f27.1e100.net.

;; TRACE
;  b.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.7.2.0.1.0.0.0.4.0.0.8.6.4.0.4.2.ip6.arpa PTR
;  . @a.root-servers.net (198.41.0.4) 12 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	a.ip6-servers.arpa.	; 199.180.182.53 2620:37:e000::53
ip6.arpa.		NS	c.ip6-servers.arpa.	; 196.216.169.11 2001:43f8:110::11
ip6.arpa.		NS	e.ip6-servers.arpa.	; 203.119.86.101 2001:dd8:6::101
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) 6.2 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. @apnic.authdns.ripe.net (193.0.9.9) 11 ms [NOERROR qr]: referral to 0.0.8.6.4.0.4.2.ip6.arpa.
0.0.8.6.4.0.4.2.ip6.arpa.		NS	ns1.google.com.	; 216.239.32.10 2001:4860:4802:32::a
0.0.8.6.4.0.4.2.ip6.arpa.		NS	ns2.google.com.	; 216.239.34.10 2001:4860:4802:34::a
0.0.8.6.4.0.4.2.ip6.arpa.		NS	ns3.google.com.	; 216.239.36.10 2001:4860:4802:36::a
0.0.8.6.4.0.4.2.ip6.arpa.		NS	ns4.google.com.	; 216.239.38.10 2001:4860:4802:38::a
;  0.0.8.6.4.0.4.2.ip6.arpa. @ns4.google.com (216.239.38.10) 6.5 ms [NOERROR qr aa]: answer
b.1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.7.2.0.1.0.0.0.4.0.0.8.6.4.0.4.2.ip6.arpa.	3600	IN	PTR	ncboms-in-f27.1e100.net.

;; NAMESERVERS (SOA asked of each address)
;  ns1.google.com [parent]
;    216.239.32.10                           ok                        1016230534  13 ms
;    2001:4860:4802:32::a                    ok                        1016687210  13 ms
;  ns2.google.com [parent]
;    216.239.34.10                           ok                        1016687210  27 ms
;    2001:4860:4802:34::a                    ok                        1016687210  27 ms
;  ns3.google.com [parent]
;    216.239.36.10                           ok                        1016687210  13 ms
;    2001:4860:4802:36::a                    ok                        1016687210  12 ms
;  ns4.google.com [parent]
;    216.239.38.10                           ok                        1016687210  6.0 ms
;    2001:4860:4802:38::a                    ok                        1016687210  5.8 ms

;; DNSSEC: unsigned

;; HOSTS
;  ns1.google.com (nameserver)
;    216.239.32.10                           PTR ns1.google.com (confirmed)
;    2001:4860:4802:32::a                    PTR ns1.google.com (confirmed)
;  ns2.google.com (nameserver)
;    216.239.34.10                           PTR ns2.google.com (confirmed)
;    2001:4860:4802:34::a                    PTR ns2.google.com (confirmed)
;  ns3.google.com (nameserver)
;    216.239.36.10                           PTR ns3.google.com (confirmed)
;    2001:4860:4802:36::a                    PTR ns3.google.com (confirmed)
;  ns4.google.com (nameserver)
;    216.239.38.10                           PTR ns4.google.com (confirmed)
;    2001:4860:4802:38::a                    PTR ns4.google.com (confirmed)
;  ncboms-in-f27.1e100.net (PTR target)
;    192.179.20.27                           PTR ncboms-in-f27.1e100.net (confirmed)
;    2404:6800:4000:1027::1b                 PTR ncboms-in-f27.1e100.net (confirmed)

;; PUBLIC RESOLVERS
;  Cloudflare PTR   ncboms-in-f27.1e100.net.  ttl 3600
;  Google     PTR   ncboms-in-f27.1e100.net.  ttl 1196
;  Quad9      PTR   ncboms-in-f27.1e100.net.  ttl 3378
;  OpenDNS    PTR   ncboms-in-f27.1e100.net.  ttl 3600