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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.

2607:f740:e651:4::1

1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.4.0.0.0.1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa

Zone 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa100 queries in 2.6 s2026-11-09 06:13:24 UTCNot DNSSEC-signed

WHOIS for 2607:f740:e651:4::1 →TextJSON
  • Problem None of 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa's nameservers gave an authoritative answer, so the zone is effectively offline.
  • Warning dns1.p01.nsone.net (198.51.44.1) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
  • Warning dns1.p01.nsone.net (2620:4d:4000:6259:7:1:0:1) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
  • Warning dns2.p01.nsone.net (198.51.45.1) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
  • Warning dns2.p01.nsone.net (2a00:edc0:6259:7:1::2) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
  • Warning dns3.p01.nsone.net (198.51.44.65) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
  • Warning dns3.p01.nsone.net (2620:4d:4000:6259:7:1:0:3) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
  • Warning dns4.p01.nsone.net (198.51.45.65) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
  • Warning dns4.p01.nsone.net (2a00:edc0:6259:7:1::4) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
  • Warning ns01.herokudns.net (45.54.92.1) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
  • Warning ns01.herokudns.net (2607:f740:e651::1) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
  • Warning ns02.herokudns.net (45.54.92.65) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
  • Warning ns02.herokudns.net (2607:f740:e651:4::1) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
  • Warning ns03.herokudns.net (45.54.92.129) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
  • Warning ns03.herokudns.net (2607:f740:e651:8::1) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
  • Warning ns04.herokudns.net (45.54.92.193) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
  • Warning ns04.herokudns.net (2607:f740:e651:c::1) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
  • Note 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

Resolution trace

  1. .asked j.root-servers.net 192.58.128.3039 ms

    Referral to ip6.arpa. signed (3 DS)

    • a.ip6-servers.arpa 199.180.182.53 2620:37:e000::53
    • b.ip6-servers.arpa 199.253.182.182 2001:500:86::86
    • c.ip6-servers.arpa 196.216.169.11 2001:43f8:110::11
    • d.ip6-servers.arpa 200.7.86.53 2001:13c7:7012::53
    • e.ip6-servers.arpa 203.119.86.101 2001:dd8:6::101
    • f.ip6-servers.arpa 193.0.9.2 2a13:27c0:30::2
  2. ip6.arpa.asked b.ip6-servers.arpa 199.253.182.1825.9 ms

    Referral to 0.6.2.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. 0.6.2.ip6.arpa.asked arin.authdns.ripe.net 193.0.9.1012 ms

    Referral to 0.4.7.f.7.0.6.2.ip6.arpa. unsigned delegation

    • ns1.vrdns.com 104.225.4.101
    • ns2.vrdns.net 209.177.157.6
    • ns3.vrdns.info 208.111.40.6
    • ns4.vrdns.co.uk 176.58.88.95

    No glue for ns1.vrdns.com, ns2.vrdns.net, ns3.vrdns.info, ns4.vrdns.co.uk: addresses looked up via a resolver.

    199.180.180.63 failed: NOERROR

  4. 0.4.7.f.7.0.6.2.ip6.arpa.asked ns2.vrdns.net 209.177.157.6100 ms

    Referral to 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa. unsigned delegation

    • dns4.p01.nsone.net 198.51.45.65 2a00:edc0:6259:7:1::4
    • dns2.p01.nsone.net 198.51.45.1 2a00:edc0:6259:7:1::2
    • ns04.herokudns.net 45.54.92.193 2607:f740:e651:c::1
    • ns03.herokudns.net 45.54.92.129 2607:f740:e651:8::1
    • ns01.herokudns.net 45.54.92.1 2607:f740:e651::1
    • ns02.herokudns.net 45.54.92.65 2607:f740:e651:4::1
    • dns3.p01.nsone.net 198.51.44.65 2620:4d:4000:6259:7:1:0:3
    • dns1.p01.nsone.net 198.51.44.1 2620:4d:4000:6259:7:1:0:1

    No glue for dns4.p01.nsone.net, dns2.p01.nsone.net, ns04.herokudns.net, ns03.herokudns.net, ns01.herokudns.net, ns02.herokudns.net, dns3.p01.nsone.net, dns1.p01.nsone.net: addresses looked up via a resolver.

  5. 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.asked dns3.p01.nsone.net 198.51.44.6515 ms

    Answer (authoritative):

    1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.4.0.0.0.1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.3600PTRns02.herokudns.net.

    45.54.92.193 failed: REFUSED

Nameservers

Every address of every nameserver, asked for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa's SOA. "Parent" means the 0.4.7.f.7.0.6.2.ip6.arpa zone delegates to it; "zone" means 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa lists it itself.

NameserverListed inAddressStatusSerialTime
dns1.p01.nsone.netparent198.51.44.1 glueREFUSED14 ms
2620:4d:4000:6259:7:1:0:1 glueREFUSED14 ms
dns2.p01.nsone.netparent198.51.45.1 glueREFUSED6.4 ms
2a00:edc0:6259:7:1::2 glueREFUSED13 ms
dns3.p01.nsone.netparent198.51.44.65 glueREFUSED14 ms
2620:4d:4000:6259:7:1:0:3 glueREFUSED14 ms
dns4.p01.nsone.netparent198.51.45.65 glueREFUSED6.0 ms
2a00:edc0:6259:7:1::4 glueREFUSED13 ms
ns01.herokudns.netparent45.54.92.1 glueREFUSED16 ms
2607:f740:e651::1 glueREFUSED16 ms
ns02.herokudns.netparent45.54.92.65 glueREFUSED17 ms
2607:f740:e651:4::1 glueREFUSED16 ms
ns03.herokudns.netparent45.54.92.129 glueREFUSED16 ms
2607:f740:e651:8::1 glueREFUSED16 ms
ns04.herokudns.netparent45.54.92.193 glueREFUSED16 ms
2607:f740:e651:c::1 glueREFUSED16 ms

DNSSEC

1.5.6.e.0.4.7.f.7.0.6.2.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)
dns1.p01.nsone.net
nameserver
198.51.44.1dns1.p01.nsone.net ✓
2620:4d:4000:6259:7:1:0:1dns1.p01.nsone.net ✓
dns2.p01.nsone.net
nameserver
198.51.45.1dns2.p01.nsone.net ✓
2a00:edc0:6259:7:1::2dns2.p01.nsone.net ✓
dns3.p01.nsone.net
nameserver
198.51.44.65dns3.p01.nsone.net ✓
2620:4d:4000:6259:7:1:0:3dns3.p01.nsone.net ✓
dns4.p01.nsone.net
nameserver
198.51.45.65dns4.p01.nsone.net ✓
2a00:edc0:6259:7:1::4dns4.p01.nsone.net ✓
ns01.herokudns.net
nameserver
45.54.92.1ns01.herokudns.net ✓
2607:f740:e651::1ns01.herokudns.net ✓
ns02.herokudns.net
nameserver
45.54.92.65ns02.herokudns.net ✓
2607:f740:e651:4::1ns02.herokudns.net ✓
ns03.herokudns.net
nameserver
45.54.92.129ns03.herokudns.net ✓
2607:f740:e651:8::1ns03.herokudns.net ✓
ns04.herokudns.net
nameserver
45.54.92.193ns04.herokudns.net ✓
2607:f740:e651:c::1ns04.herokudns.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 1.1.1.1ns02.herokudns.net.
TTL 3600
Google 8.8.8.8ns02.herokudns.net.
TTL 3600
Quad9 9.9.9.9timed out
OpenDNS 208.67.222.222ns02.herokudns.net.
TTL 3600

Text dump

; DNS report for 1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.4.0.0.0.1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa (2607:f740:e651:4::1)
; 2026-11-09 06:13:24 UTC, 100 queries in 2.59 s, zone 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa

;; FINDINGS
;  [ERROR] None of 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa's nameservers gave an authoritative answer, so the zone is effectively offline.
;  [WARN] dns1.p01.nsone.net (198.51.44.1) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
;  [WARN] dns1.p01.nsone.net (2620:4d:4000:6259:7:1:0:1) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
;  [WARN] dns2.p01.nsone.net (198.51.45.1) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
;  [WARN] dns2.p01.nsone.net (2a00:edc0:6259:7:1::2) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
;  [WARN] dns3.p01.nsone.net (198.51.44.65) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
;  [WARN] dns3.p01.nsone.net (2620:4d:4000:6259:7:1:0:3) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
;  [WARN] dns4.p01.nsone.net (198.51.45.65) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
;  [WARN] dns4.p01.nsone.net (2a00:edc0:6259:7:1::4) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
;  [WARN] ns01.herokudns.net (45.54.92.1) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
;  [WARN] ns01.herokudns.net (2607:f740:e651::1) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
;  [WARN] ns02.herokudns.net (45.54.92.65) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
;  [WARN] ns02.herokudns.net (2607:f740:e651:4::1) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
;  [WARN] ns03.herokudns.net (45.54.92.129) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
;  [WARN] ns03.herokudns.net (2607:f740:e651:8::1) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
;  [WARN] ns04.herokudns.net (45.54.92.193) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
;  [WARN] ns04.herokudns.net (2607:f740:e651:c::1) answers REFUSED for 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
;  [INFO] 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

;; TRACE
;  1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.4.0.0.0.1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa PTR
;  . @j.root-servers.net (192.58.128.30) 39 ms [NOERROR qr]: referral to ip6.arpa.
ip6.arpa.		NS	a.ip6-servers.arpa.	; 199.180.182.53 2620:37:e000::53
ip6.arpa.		NS	b.ip6-servers.arpa.	; 199.253.182.182 2001:500:86::86
ip6.arpa.		NS	c.ip6-servers.arpa.	; 196.216.169.11 2001:43f8:110::11
ip6.arpa.		NS	d.ip6-servers.arpa.	; 200.7.86.53 2001:13c7:7012::53
ip6.arpa.		NS	e.ip6-servers.arpa.	; 203.119.86.101 2001:dd8:6::101
ip6.arpa.		NS	f.ip6-servers.arpa.	; 193.0.9.2 2a13:27c0:30::2
ip6.arpa.	86400	IN	DS	13880 8 2 068554EFCB5861F42AF93EF8E79C442A86C16FC5652E6B6D2419ED527F344D17
ip6.arpa.	86400	IN	DS	45094 8 2 E6B54E0A20CE1EDBFCB6879C02F5782059CECB043A31D804A04AFA51AF01D5FB
ip6.arpa.	86400	IN	DS	64060 8 2 8A11501086330132BE2C23F22DEDF0634AD5FF668B4AA1988E172C6A2A4E5F7B
;  ip6.arpa. @b.ip6-servers.arpa (199.253.182.182) 5.9 ms [NOERROR qr]: referral to 0.6.2.ip6.arpa.
0.6.2.ip6.arpa.		NS	r.arin.net.	; 199.180.180.63 2001:500:f0::63
0.6.2.ip6.arpa.		NS	u.arin.net.	; 204.61.216.50 2001:500:14:6050:ad::1
0.6.2.ip6.arpa.		NS	x.arin.net.	; 199.180.180.63 2001:500:f0::63
0.6.2.ip6.arpa.		NS	y.arin.net.	; 192.82.134.30 2001:500:127::30
0.6.2.ip6.arpa.		NS	z.arin.net.	; 199.180.180.63 2001:500:f0::63
0.6.2.ip6.arpa.		NS	arin.authdns.ripe.net.	; 193.0.9.10 2a13:27c0:30::10
0.6.2.ip6.arpa.	86400	IN	DS	38329 8 2 A1341E46247644D35D5E6E2DDD0A9AA680152C25A7356487A9D597BB7FBFFD79
;  0.6.2.ip6.arpa. @arin.authdns.ripe.net (193.0.9.10) 12 ms [NOERROR qr]: referral to 0.4.7.f.7.0.6.2.ip6.arpa.
0.4.7.f.7.0.6.2.ip6.arpa.		NS	ns1.vrdns.com.	; 104.225.4.101
0.4.7.f.7.0.6.2.ip6.arpa.		NS	ns2.vrdns.net.	; 209.177.157.6
0.4.7.f.7.0.6.2.ip6.arpa.		NS	ns3.vrdns.info.	; 208.111.40.6
0.4.7.f.7.0.6.2.ip6.arpa.		NS	ns4.vrdns.co.uk.	; 176.58.88.95
;  0.4.7.f.7.0.6.2.ip6.arpa. @ns2.vrdns.net (209.177.157.6) 100 ms [NOERROR qr]: referral to 1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.
1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.		NS	dns4.p01.nsone.net.	; 198.51.45.65 2a00:edc0:6259:7:1::4
1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.		NS	dns2.p01.nsone.net.	; 198.51.45.1 2a00:edc0:6259:7:1::2
1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.		NS	ns04.herokudns.net.	; 45.54.92.193 2607:f740:e651:c::1
1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.		NS	ns03.herokudns.net.	; 45.54.92.129 2607:f740:e651:8::1
1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.		NS	ns01.herokudns.net.	; 45.54.92.1 2607:f740:e651::1
1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.		NS	ns02.herokudns.net.	; 45.54.92.65 2607:f740:e651:4::1
1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.		NS	dns3.p01.nsone.net.	; 198.51.44.65 2620:4d:4000:6259:7:1:0:3
1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.		NS	dns1.p01.nsone.net.	; 198.51.44.1 2620:4d:4000:6259:7:1:0:1
;  1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa. @dns3.p01.nsone.net (198.51.44.65) 15 ms [NOERROR qr aa]: answer
1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.4.0.0.0.1.5.6.e.0.4.7.f.7.0.6.2.ip6.arpa.	3600	IN	PTR	ns02.herokudns.net.

;; NAMESERVERS (SOA asked of each address)
;  dns1.p01.nsone.net [parent]
;    198.51.44.1                             REFUSED                               14 ms
;    2620:4d:4000:6259:7:1:0:1               REFUSED                               14 ms
;  dns2.p01.nsone.net [parent]
;    198.51.45.1                             REFUSED                               6.4 ms
;    2a00:edc0:6259:7:1::2                   REFUSED                               13 ms
;  dns3.p01.nsone.net [parent]
;    198.51.44.65                            REFUSED                               14 ms
;    2620:4d:4000:6259:7:1:0:3               REFUSED                               14 ms
;  dns4.p01.nsone.net [parent]
;    198.51.45.65                            REFUSED                               6.0 ms
;    2a00:edc0:6259:7:1::4                   REFUSED                               13 ms
;  ns01.herokudns.net [parent]
;    45.54.92.1                              REFUSED                               16 ms
;    2607:f740:e651::1                       REFUSED                               16 ms
;  ns02.herokudns.net [parent]
;    45.54.92.65                             REFUSED                               17 ms
;    2607:f740:e651:4::1                     REFUSED                               16 ms
;  ns03.herokudns.net [parent]
;    45.54.92.129                            REFUSED                               16 ms
;    2607:f740:e651:8::1                     REFUSED                               16 ms
;  ns04.herokudns.net [parent]
;    45.54.92.193                            REFUSED                               16 ms
;    2607:f740:e651:c::1                     REFUSED                               16 ms

;; DNSSEC: unsigned

;; HOSTS
;  dns1.p01.nsone.net (nameserver)
;    198.51.44.1                             PTR dns1.p01.nsone.net (confirmed)
;    2620:4d:4000:6259:7:1:0:1               PTR dns1.p01.nsone.net (confirmed)
;  dns2.p01.nsone.net (nameserver)
;    198.51.45.1                             PTR dns2.p01.nsone.net (confirmed)
;    2a00:edc0:6259:7:1::2                   PTR dns2.p01.nsone.net (confirmed)
;  dns3.p01.nsone.net (nameserver)
;    198.51.44.65                            PTR dns3.p01.nsone.net (confirmed)
;    2620:4d:4000:6259:7:1:0:3               PTR dns3.p01.nsone.net (confirmed)
;  dns4.p01.nsone.net (nameserver)
;    198.51.45.65                            PTR dns4.p01.nsone.net (confirmed)
;    2a00:edc0:6259:7:1::4                   PTR dns4.p01.nsone.net (confirmed)
;  ns01.herokudns.net (nameserver)
;    45.54.92.1                              PTR ns01.herokudns.net (confirmed)
;    2607:f740:e651::1                       PTR ns01.herokudns.net (confirmed)
;  ns02.herokudns.net (nameserver)
;    45.54.92.65                             PTR ns02.herokudns.net (confirmed)
;    2607:f740:e651:4::1                     PTR ns02.herokudns.net (confirmed)
;  ns03.herokudns.net (nameserver)
;    45.54.92.129                            PTR ns03.herokudns.net (confirmed)
;    2607:f740:e651:8::1                     PTR ns03.herokudns.net (confirmed)
;  ns04.herokudns.net (nameserver)
;    45.54.92.193                            PTR ns04.herokudns.net (confirmed)
;    2607:f740:e651:c::1                     PTR ns04.herokudns.net (confirmed)

;; PUBLIC RESOLVERS
;  Cloudflare PTR   ns02.herokudns.net.  ttl 3600  DIFFERS
;  Google     PTR   ns02.herokudns.net.  ttl 3600  DIFFERS
;  Quad9      PTR   timed out
;  OpenDNS    PTR   ns02.herokudns.net.  ttl 3600  DIFFERS