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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.

148.163.242.129

129.242.163.148.in-addr.arpa

Zone 242.163.148.in-addr.arpa108 queries in 0.7 s2026-11-09 06:12:59 UTCNot DNSSEC-signed

WHOIS for 148.163.242.129 →TextJSON
  • Warning The parent zone delegates to dns1.p01.nsone.net, dns2.p01.nsone.net, dns3.p01.nsone.net, dns4.p01.nsone.net but 242.163.148.in-addr.arpa itself lists dns1.p01.nsone.net, dns2.p01.nsone.net, dns3.p01.nsone.net, dns4.p01.nsone.net, ns01.internetoperations.net, ns02.internetoperations.net, ns03.internetoperations.net, ns04.internetoperations.net. Make the two lists match.
  • Note 242.163.148.in-addr.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

Records

Asked directly of dns4.p01.nsone.net (198.51.45.65), an authoritative server: no cache in between, so these are the live values.

PTR Reverse pointer

3600PTRns03.internetoperations.net.
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 192.36.148.176.0 ms

    Referral to in-addr.arpa. signed (4 DS)

    • 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
    • a.in-addr-servers.arpa 199.180.182.53 2620:37:e000::53

    202.12.27.33 failed: NOERROR

  2. in-addr.arpa.asked b.in-addr-servers.arpa 199.253.183.1835.9 ms

    Referral to 148.in-addr.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.

  3. 148.in-addr.arpa.asked r.arin.net 199.180.180.6390 ms

    Referral to 242.163.148.in-addr.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
    • dns1.p01.nsone.net 198.51.44.1 2620:4d:4000:6259:7:1:0:1
    • dns3.p01.nsone.net 198.51.44.65 2620:4d:4000:6259:7:1:0:3

    No glue for dns4.p01.nsone.net, dns2.p01.nsone.net, dns1.p01.nsone.net, dns3.p01.nsone.net: addresses looked up via a resolver.

    199.180.180.63 failed: NOERROR

  4. 242.163.148.in-addr.arpa.asked dns2.p01.nsone.net 198.51.45.16.0 ms

    Answer (authoritative):

    129.242.163.148.in-addr.arpa.3600PTRns03.internetoperations.net.

    198.51.44.1 failed: NOERROR

Nameservers

Every address of every nameserver, asked for 242.163.148.in-addr.arpa's SOA. "Parent" means the 148.in-addr.arpa zone delegates to it; "zone" means 242.163.148.in-addr.arpa lists it itself.

NameserverListed inAddressStatusSerialTime
dns1.p01.nsone.netparent + zone198.51.44.1 glueauthoritative149704426114 ms
2620:4d:4000:6259:7:1:0:1 glueauthoritative149704426114 ms
dns2.p01.nsone.netparent + zone198.51.45.1 glueauthoritative14970442616.0 ms
2a00:edc0:6259:7:1::2 glueauthoritative149704426112 ms
dns3.p01.nsone.netparent + zone198.51.44.65 glueauthoritative149704426113 ms
2620:4d:4000:6259:7:1:0:3 glueauthoritative149704426114 ms
dns4.p01.nsone.netparent + zone198.51.45.65 glueauthoritative14970442615.8 ms
2a00:edc0:6259:7:1::4 glueauthoritative149704426113 ms
ns01.internetoperations.netzone148.163.242.1authoritative149704426116 ms
ns02.internetoperations.netzone148.163.242.65authoritative149704426116 ms
ns03.internetoperations.netzone148.163.242.129authoritative149704426116 ms
ns04.internetoperations.netzone148.163.242.193authoritative149704426116 ms

DNSSEC

242.163.148.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.

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.internetoperations.net
nameserver
148.163.242.1ns01.internetoperations.net ✓
ns02.internetoperations.net
nameserver
148.163.242.65ns02.internetoperations.net ✓
ns03.internetoperations.net
nameserver · PTR target
148.163.242.129ns03.internetoperations.net ✓
ns04.internetoperations.net
nameserver
148.163.242.193ns04.internetoperations.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 1.1.1.1ns03.internetoperations.net.
TTL 3600
Google 8.8.8.8ns03.internetoperations.net.
TTL 3600
Quad9 9.9.9.9ns03.internetoperations.net.
TTL 3600
OpenDNS 208.67.222.222ns03.internetoperations.net.
TTL 3600

Text dump

; DNS report for 129.242.163.148.in-addr.arpa (148.163.242.129)
; 2026-11-09 06:12:59 UTC, 108 queries in 0.69 s, zone 242.163.148.in-addr.arpa

;; FINDINGS
;  [WARN] The parent zone delegates to dns1.p01.nsone.net, dns2.p01.nsone.net, dns3.p01.nsone.net, dns4.p01.nsone.net but 242.163.148.in-addr.arpa itself lists dns1.p01.nsone.net, dns2.p01.nsone.net, dns3.p01.nsone.net, dns4.p01.nsone.net, ns01.internetoperations.net, ns02.internetoperations.net, ns03.internetoperations.net, ns04.internetoperations.net. Make the two lists match.
;  [INFO] 242.163.148.in-addr.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

;; RECORDS (authoritative, from dns4.p01.nsone.net (198.51.45.65))
129.242.163.148.in-addr.arpa.	3600	IN	PTR	ns03.internetoperations.net.

;; TRACE
;  129.242.163.148.in-addr.arpa PTR
;  . @i.root-servers.net (192.36.148.17) 6.0 ms [NOERROR qr]: referral to in-addr.arpa.
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.		NS	a.in-addr-servers.arpa.	; 199.180.182.53 2620:37:e000::53
in-addr.arpa.	86400	IN	DS	47054 8 2 5CAFCCEC201D1933B4C9F6A9C8F51E51F3B39979058AC21B8DF1B1F281CBC6F2
in-addr.arpa.	86400	IN	DS	54956 8 2 E0E2BF5CFBD66572CA05EC18267D91509BA6A9405AF05C3FD4141DFA45200C08
in-addr.arpa.	86400	IN	DS	53696 8 2 13E5501C56B20394DA921B51412D48B7089C5EB6957A7C58553C4D4D424F04DF
in-addr.arpa.	86400	IN	DS	63982 8 2 AAF4FB5D213EF25AE44679032EBE3514C487D7ABD99D7F5FEC3383D030733C73
;  in-addr.arpa. @b.in-addr-servers.arpa (199.253.183.183) 5.9 ms [NOERROR qr]: referral to 148.in-addr.arpa.
148.in-addr.arpa.		NS	r.arin.net.	; 199.180.180.63 2001:500:f0::63
148.in-addr.arpa.		NS	u.arin.net.	; 204.61.216.50 2001:500:14:6050:ad::1
148.in-addr.arpa.		NS	x.arin.net.	; 199.180.180.63 2001:500:f0::63
148.in-addr.arpa.		NS	y.arin.net.	; 192.82.134.30 2001:500:127::30
148.in-addr.arpa.		NS	z.arin.net.	; 199.180.180.63 2001:500:f0::63
148.in-addr.arpa.		NS	arin.authdns.ripe.net.	; 193.0.9.10 2a13:27c0:30::10
148.in-addr.arpa.	86400	IN	DS	18451 8 2 16C0B095D3DDB9F9F85DB0FAEAA87823F9FE847BC07E514C48F7E78E23A712F7
;  148.in-addr.arpa. @r.arin.net (199.180.180.63) 90 ms [NOERROR qr]: referral to 242.163.148.in-addr.arpa.
242.163.148.in-addr.arpa.		NS	dns4.p01.nsone.net.	; 198.51.45.65 2a00:edc0:6259:7:1::4
242.163.148.in-addr.arpa.		NS	dns2.p01.nsone.net.	; 198.51.45.1 2a00:edc0:6259:7:1::2
242.163.148.in-addr.arpa.		NS	dns1.p01.nsone.net.	; 198.51.44.1 2620:4d:4000:6259:7:1:0:1
242.163.148.in-addr.arpa.		NS	dns3.p01.nsone.net.	; 198.51.44.65 2620:4d:4000:6259:7:1:0:3
;  242.163.148.in-addr.arpa. @dns2.p01.nsone.net (198.51.45.1) 6.0 ms [NOERROR qr aa]: answer
129.242.163.148.in-addr.arpa.	3600	IN	PTR	ns03.internetoperations.net.

;; NAMESERVERS (SOA asked of each address)
;  dns1.p01.nsone.net [parent+zone]
;    198.51.44.1                             ok                        1497044261  14 ms
;    2620:4d:4000:6259:7:1:0:1               ok                        1497044261  14 ms
;  dns2.p01.nsone.net [parent+zone]
;    198.51.45.1                             ok                        1497044261  6.0 ms
;    2a00:edc0:6259:7:1::2                   ok                        1497044261  12 ms
;  dns3.p01.nsone.net [parent+zone]
;    198.51.44.65                            ok                        1497044261  13 ms
;    2620:4d:4000:6259:7:1:0:3               ok                        1497044261  14 ms
;  dns4.p01.nsone.net [parent+zone]
;    198.51.45.65                            ok                        1497044261  5.8 ms
;    2a00:edc0:6259:7:1::4                   ok                        1497044261  13 ms
;  ns01.internetoperations.net [zone]
;    148.163.242.1                           ok                        1497044261  16 ms
;  ns02.internetoperations.net [zone]
;    148.163.242.65                          ok                        1497044261  16 ms
;  ns03.internetoperations.net [zone]
;    148.163.242.129                         ok                        1497044261  16 ms
;  ns04.internetoperations.net [zone]
;    148.163.242.193                         ok                        1497044261  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.internetoperations.net (nameserver)
;    148.163.242.1                           PTR ns01.internetoperations.net (confirmed)
;  ns02.internetoperations.net (nameserver)
;    148.163.242.65                          PTR ns02.internetoperations.net (confirmed)
;  ns03.internetoperations.net (nameserver; PTR target)
;    148.163.242.129                         PTR ns03.internetoperations.net (confirmed)
;  ns04.internetoperations.net (nameserver)
;    148.163.242.193                         PTR ns04.internetoperations.net (confirmed)

;; PUBLIC RESOLVERS
;  Cloudflare PTR   ns03.internetoperations.net.  ttl 3600
;  Google     PTR   ns03.internetoperations.net.  ttl 3600
;  Quad9      PTR   ns03.internetoperations.net.  ttl 3600
;  OpenDNS    PTR   ns03.internetoperations.net.  ttl 3600