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.

156.154.64.10

10.64.154.156.in-addr.arpa

Zone 64.154.156.in-addr.arpa124 queries in 0.7 s2026-11-09 05:45:07 UTCNot DNSSEC-signed

WHOIS for 156.154.64.10 →Text JSON

Warning The parent zone delegates to pdns1.ultradns.net, pdns2.ultradns.net, pdns3.ultradns.org, pdns4.ultradns.org, pdns5.ultradns.info, pdns6.ultradns.co.uk but 64.154.156.in-addr.arpa itself lists udns1.ultradns.net, udns2.ultradns.net. Make the two lists match.
Note 64.154.156.in-addr.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

Records

Asked directly of pdns1.ultradns.net (204.74.108.1), an authoritative server: no cache in between, so these are the live values.

PTR Reverse pointer

3600

PTR

u1.amazonaws.com.

ANY query: refused politely (RFC 8482)

3600

HINFO

"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

.asked j.root-servers.net 192.58.128.3039 ms
Referral to in-addr.arpa. signed (4 DS)
- a.in-addr-servers.arpa 199.180.182.53 2620:37:e000::53
- b.in-addr-servers.arpa 199.253.183.183 2001:500:87::87
- c.in-addr-servers.arpa 196.216.169.10 2001:43f8:110::10
- d.in-addr-servers.arpa 200.10.60.53 2001:13c7:7010::53
- e.in-addr-servers.arpa 203.119.86.101 2001:dd8:6::101
- f.in-addr-servers.arpa 193.0.9.1 2a13:27c0:30::1
192.33.4.12 failed: NOERROR
in-addr.arpa.asked d.in-addr-servers.arpa 200.10.60.53118 ms
Referral to 156.in-addr.arpa. signed (1 DS)
- y.arin.net 192.82.134.30 2001:500:127::30
- 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
- arin.authdns.ripe.net 193.0.9.10 2a13:27c0:30::10
- z.arin.net 199.180.180.63 2001:500:f0::63
No glue for y.arin.net, r.arin.net, u.arin.net, x.arin.net, arin.authdns.ripe.net, z.arin.net: addresses looked up via a resolver.
156.in-addr.arpa.asked u.arin.net 204.61.216.506.0 ms
Referral to 64.154.156.in-addr.arpa. unsigned delegation
- pdns2.ultradns.net 204.74.109.1 2610:a1:1014::1
- pdns6.ultradns.co.uk 204.74.115.1 2610:a1:1017::1
- pdns4.ultradns.org 199.7.69.1 2001:502:4612::1
- pdns5.ultradns.info 204.74.114.1 2610:a1:1016::1
- pdns1.ultradns.net 204.74.108.1 2001:502:f3ff::1
- pdns3.ultradns.org 199.7.68.1 2610:a1:1015::1
No glue for pdns2.ultradns.net, pdns6.ultradns.co.uk, pdns4.ultradns.org, pdns5.ultradns.info, pdns1.ultradns.net, pdns3.ultradns.org: addresses looked up via a resolver.
192.82.134.30 failed: NOERROR
64.154.156.in-addr.arpa.asked pdns5.ultradns.info 204.74.114.15.8 ms
Answer (authoritative):
10.64.154.156.in-addr.arpa. 3600 PTR u1.amazonaws.com.
204.74.109.1 failed: NOERROR

Nameservers

Every address of every nameserver, asked for 64.154.156.in-addr.arpa's SOA. "Parent" means the 156.in-addr.arpa zone delegates to it; "zone" means 64.154.156.in-addr.arpa lists it itself.

Nameserver

Listed in

Address

Status

Serial

Time

pdns1.ultradns.net

parent

204.74.108.1 glue

authoritative

2013082750

5.8 ms

2001:502:f3ff::1 glue

authoritative

2013082750

5.8 ms

pdns2.ultradns.net

parent

204.74.109.1 glue

authoritative

2013082750

5.8 ms

2610:a1:1014::1 glue

authoritative

2013082750

6.0 ms

pdns3.ultradns.org

parent

199.7.68.1 glue

authoritative

2013082750

5.9 ms

2610:a1:1015::1 glue

authoritative

2013082750

14 ms

pdns4.ultradns.org

parent

199.7.69.1 glue

authoritative

2013082750

31 ms

2001:502:4612::1 glue

authoritative

2013082750

30 ms

pdns5.ultradns.info

parent

204.74.114.1 glue

authoritative

2013082750

5.9 ms

2610:a1:1016::1 glue

authoritative

2013082750

5.9 ms

pdns6.ultradns.co.uk

parent

204.74.115.1 glue

authoritative

2013082750

17 ms

2610:a1:1017::1 glue

authoritative

2013082750

17 ms

udns1.ultradns.net

zone

204.69.234.1

authoritative

2013082750

6.6 ms

2001:502:f3ff::d

authoritative

2013082750

6.7 ms

udns2.ultradns.net

zone

204.74.101.1

authoritative

2013082750

30 ms

2610:a1:1014::d

authoritative

2013082750

6.4 ms

DNSSEC

64.154.156.in-addr.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.

Host

Address

Reverse DNS (PTR)

pdns1.ultradns.net

nameserver

204.74.108.1

pdns1.ultradns.net ✓

2001:502:f3ff::1

pdns1.ultradns.net ✓

pdns2.ultradns.net

nameserver

204.74.109.1

pdns2.ultradns.net ✓

2610:a1:1014::1

pdns2.ultradns.net ✓

pdns3.ultradns.org

nameserver

199.7.68.1

pdns3.ultradns.org ✓

2610:a1:1015::1

pdns3.ultradns.org ✓

pdns4.ultradns.org

nameserver

199.7.69.1

pdns4.ultradns.org ✓

2001:502:4612::1

pdns4.ultradns.org ✓

pdns5.ultradns.info

nameserver

204.74.114.1

pdns5.ultradns.info ✓

2610:a1:1016::1

pdns5.ultradns.info ✓

pdns6.ultradns.co.uk

nameserver

204.74.115.1

pdns6.ultradns.co.uk ✓

2610:a1:1017::1

pdns6.ultradns.co.uk ✓

udns1.ultradns.net

nameserver

204.69.234.1

udns1.ultradns.net ✓

2001:502:f3ff::d

udns1.ultradns.net ✓

udns2.ultradns.net

nameserver

204.74.101.1

udns2.ultradns.net ✓

2610:a1:1014::d

udns2.ultradns.net ✓

u1.amazonaws.com

PTR target

156.154.64.10

u1.amazonaws.com ✓

2001:502:f3ff::10

u1.amazonaws.com ✓

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.

Resolver

PTR

Cloudflare 1.1.1.1

u1.amazonaws.com.

TTL 3600

Google 8.8.8.8

u1.amazonaws.com.

TTL 473

Quad9 9.9.9.9

u1.amazonaws.com.

TTL 3600

OpenDNS 208.67.222.222

u1.amazonaws.com.

TTL 3600

Text dump

; DNS report for 10.64.154.156.in-addr.arpa (156.154.64.10)
; 2026-11-09 05:45:07 UTC, 124 queries in 0.72 s, zone 64.154.156.in-addr.arpa

;; FINDINGS
;  [WARN] The parent zone delegates to pdns1.ultradns.net, pdns2.ultradns.net, pdns3.ultradns.org, pdns4.ultradns.org, pdns5.ultradns.info, pdns6.ultradns.co.uk but 64.154.156.in-addr.arpa itself lists udns1.ultradns.net, udns2.ultradns.net. Make the two lists match.
;  [INFO] 64.154.156.in-addr.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

;; RECORDS (authoritative, from pdns1.ultradns.net (204.74.108.1))
10.64.154.156.in-addr.arpa.	3600	IN	PTR	u1.amazonaws.com.

;; TRACE
;  10.64.154.156.in-addr.arpa PTR
;  . @j.root-servers.net (192.58.128.30) 39 ms [NOERROR qr]: referral to in-addr.arpa.
in-addr.arpa.		NS	a.in-addr-servers.arpa.	; 199.180.182.53 2620:37:e000::53
in-addr.arpa.		NS	b.in-addr-servers.arpa.	; 199.253.183.183 2001:500:87::87
in-addr.arpa.		NS	c.in-addr-servers.arpa.	; 196.216.169.10 2001:43f8:110::10
in-addr.arpa.		NS	d.in-addr-servers.arpa.	; 200.10.60.53 2001:13c7:7010::53
in-addr.arpa.		NS	e.in-addr-servers.arpa.	; 203.119.86.101 2001:dd8:6::101
in-addr.arpa.		NS	f.in-addr-servers.arpa.	; 193.0.9.1 2a13:27c0:30::1
in-addr.arpa.	86400	IN	DS	47054 8 2 5CAFCCEC201D1933B4C9F6A9C8F51E51F3B39979058AC21B8DF1B1F281CBC6F2
in-addr.arpa.	86400	IN	DS	53696 8 2 13E5501C56B20394DA921B51412D48B7089C5EB6957A7C58553C4D4D424F04DF
in-addr.arpa.	86400	IN	DS	54956 8 2 E0E2BF5CFBD66572CA05EC18267D91509BA6A9405AF05C3FD4141DFA45200C08
in-addr.arpa.	86400	IN	DS	63982 8 2 AAF4FB5D213EF25AE44679032EBE3514C487D7ABD99D7F5FEC3383D030733C73
;  in-addr.arpa. @d.in-addr-servers.arpa (200.10.60.53) 118 ms [NOERROR qr]: referral to 156.in-addr.arpa.
156.in-addr.arpa.		NS	y.arin.net.	; 192.82.134.30 2001:500:127::30
156.in-addr.arpa.		NS	r.arin.net.	; 199.180.180.63 2001:500:f0::63
156.in-addr.arpa.		NS	u.arin.net.	; 204.61.216.50 2001:500:14:6050:ad::1
156.in-addr.arpa.		NS	x.arin.net.	; 199.180.180.63 2001:500:f0::63
156.in-addr.arpa.		NS	arin.authdns.ripe.net.	; 193.0.9.10 2a13:27c0:30::10
156.in-addr.arpa.		NS	z.arin.net.	; 199.180.180.63 2001:500:f0::63
156.in-addr.arpa.	86400	IN	DS	55537 8 2 0EFB64C6ECD139A1773F114F0724814AF8B145BAA9DB61C98438BC082E2D02A1
;  156.in-addr.arpa. @u.arin.net (204.61.216.50) 6.0 ms [NOERROR qr]: referral to 64.154.156.in-addr.arpa.
64.154.156.in-addr.arpa.		NS	pdns2.ultradns.net.	; 204.74.109.1 2610:a1:1014::1
64.154.156.in-addr.arpa.		NS	pdns6.ultradns.co.uk.	; 204.74.115.1 2610:a1:1017::1
64.154.156.in-addr.arpa.		NS	pdns4.ultradns.org.	; 199.7.69.1 2001:502:4612::1
64.154.156.in-addr.arpa.		NS	pdns5.ultradns.info.	; 204.74.114.1 2610:a1:1016::1
64.154.156.in-addr.arpa.		NS	pdns1.ultradns.net.	; 204.74.108.1 2001:502:f3ff::1
64.154.156.in-addr.arpa.		NS	pdns3.ultradns.org.	; 199.7.68.1 2610:a1:1015::1
;  64.154.156.in-addr.arpa. @pdns5.ultradns.info (204.74.114.1) 5.8 ms [NOERROR qr aa]: answer
10.64.154.156.in-addr.arpa.	3600	IN	PTR	u1.amazonaws.com.

;; NAMESERVERS (SOA asked of each address)
;  pdns1.ultradns.net [parent]
;    204.74.108.1                            ok                        2013082750  5.8 ms
;    2001:502:f3ff::1                        ok                        2013082750  5.8 ms
;  pdns2.ultradns.net [parent]
;    204.74.109.1                            ok                        2013082750  5.8 ms
;    2610:a1:1014::1                         ok                        2013082750  6.0 ms
;  pdns3.ultradns.org [parent]
;    199.7.68.1                              ok                        2013082750  5.9 ms
;    2610:a1:1015::1                         ok                        2013082750  14 ms
;  pdns4.ultradns.org [parent]
;    199.7.69.1                              ok                        2013082750  31 ms
;    2001:502:4612::1                        ok                        2013082750  30 ms
;  pdns5.ultradns.info [parent]
;    204.74.114.1                            ok                        2013082750  5.9 ms
;    2610:a1:1016::1                         ok                        2013082750  5.9 ms
;  pdns6.ultradns.co.uk [parent]
;    204.74.115.1                            ok                        2013082750  17 ms
;    2610:a1:1017::1                         ok                        2013082750  17 ms
;  udns1.ultradns.net [zone]
;    204.69.234.1                            ok                        2013082750  6.6 ms
;    2001:502:f3ff::d                        ok                        2013082750  6.7 ms
;  udns2.ultradns.net [zone]
;    204.74.101.1                            ok                        2013082750  30 ms
;    2610:a1:1014::d                         ok                        2013082750  6.4 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)
;    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)
;  u1.amazonaws.com (PTR target)
;    156.154.64.10                           PTR u1.amazonaws.com (confirmed)
;    2001:502:f3ff::10                       PTR u1.amazonaws.com (confirmed)

;; PUBLIC RESOLVERS
;  Cloudflare PTR   u1.amazonaws.com.  ttl 3600
;  Google     PTR   u1.amazonaws.com.  ttl 473
;  Quad9      PTR   u1.amazonaws.com.  ttl 3600
;  OpenDNS    PTR   u1.amazonaws.com.  ttl 3600