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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.

173.245.58.88

88.58.245.173.in-addr.arpa

Zone 58.245.173.in-addr.arpa104 queries in 0.7 s2026-11-09 05:40:45 UTCNot DNSSEC-signed

WHOIS for 173.245.58.88 →TextJSON
  • Note 58.245.173.in-addr.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

Records

Asked directly of jill.ns.cloudflare.com (173.245.58.122), an authoritative server: no cache in between, so these are the live values.

PTR Reverse pointer

1800PTRcruz.ns.cloudflare.com.
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 l.root-servers.net 199.7.83.425.9 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
  2. in-addr.arpa.asked b.in-addr-servers.arpa 199.253.183.1835.7 ms

    Referral to 173.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. 173.in-addr.arpa.asked x.arin.net 199.180.180.6392 ms

    Referral to 58.245.173.in-addr.arpa. unsigned delegation

    • skip.ns.cloudflare.com 108.162.193.233 172.64.33.233 173.245.59.233 2606:4700:58::adf5:3be9 2803:f800:50::6ca2:c1e9 2a06:98c1:50::ac40:21e9
    • jill.ns.cloudflare.com 108.162.192.122 172.64.32.122 173.245.58.122 2606:4700:50::adf5:3a7a 2803:f800:50::6ca2:c07a 2a06:98c1:50::ac40:207a

    No glue for skip.ns.cloudflare.com, jill.ns.cloudflare.com: addresses looked up via a resolver.

    199.180.180.63 failed: NOERROR

  4. 58.245.173.in-addr.arpa.asked jill.ns.cloudflare.com 108.162.192.1227.1 ms

    Answer (authoritative):

    88.58.245.173.in-addr.arpa.1800PTRcruz.ns.cloudflare.com.

Nameservers

Every address of every nameserver, asked for 58.245.173.in-addr.arpa's SOA. "Parent" means the 173.in-addr.arpa zone delegates to it; "zone" means 58.245.173.in-addr.arpa lists it itself.

NameserverListed inAddressStatusSerialTime
jill.ns.cloudflare.comparent + zone108.162.192.122 glueauthoritative20367659656.4 ms
172.64.32.122 glueauthoritative20367659656.8 ms
173.245.58.122 glueauthoritative20367659656.1 ms
2606:4700:50::adf5:3a7a glueauthoritative20367659656.9 ms
2803:f800:50::6ca2:c07a glueauthoritative20367659656.8 ms
2a06:98c1:50::ac40:207a glueauthoritative20367659657.5 ms
skip.ns.cloudflare.comparent + zone108.162.193.233 glueauthoritative20367659656.4 ms
172.64.33.233 glueauthoritative20367659656.3 ms
173.245.59.233 glueauthoritative20367659657.5 ms
2606:4700:58::adf5:3be9 glueauthoritative20367659656.7 ms
2803:f800:50::6ca2:c1e9 glueauthoritative20367659657.3 ms
2a06:98c1:50::ac40:21e9 glueauthoritative20367659656.5 ms

DNSSEC

58.245.173.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)
jill.ns.cloudflare.com
nameserver
108.162.192.122jill.ns.cloudflare.com ✓
172.64.32.122jill.ns.cloudflare.com ✓
173.245.58.122jill.ns.cloudflare.com ✓
2606:4700:50::adf5:3a7ajill.ns.cloudflare.com ✓
2803:f800:50::6ca2:c07ajill.ns.cloudflare.com ✓
2a06:98c1:50::ac40:207ajill.ns.cloudflare.com ✓
skip.ns.cloudflare.com
nameserver
108.162.193.233skip.ns.cloudflare.com ✓
172.64.33.233skip.ns.cloudflare.com ✓
173.245.59.233skip.ns.cloudflare.com ✓
2606:4700:58::adf5:3be9skip.ns.cloudflare.com ✓
2803:f800:50::6ca2:c1e9skip.ns.cloudflare.com ✓
2a06:98c1:50::ac40:21e9skip.ns.cloudflare.com ✓
cruz.ns.cloudflare.com
PTR target
108.162.192.88cruz.ns.cloudflare.com ✓
172.64.32.88cruz.ns.cloudflare.com ✓
173.245.58.88cruz.ns.cloudflare.com ✓
2606:4700:50::adf5:3a58cruz.ns.cloudflare.com ✓
2803:f800:50::6ca2:c058cruz.ns.cloudflare.com ✓
2a06:98c1:50::ac40:2058cruz.ns.cloudflare.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.

ResolverPTR
Cloudflare 1.1.1.1cruz.ns.cloudflare.com.
TTL 1800
Google 8.8.8.8cruz.ns.cloudflare.com.
TTL 1669
Quad9 9.9.9.9cruz.ns.cloudflare.com.
TTL 1800
OpenDNS 208.67.222.222cruz.ns.cloudflare.com.
TTL 1800

Text dump

; DNS report for 88.58.245.173.in-addr.arpa (173.245.58.88)
; 2026-11-09 05:40:45 UTC, 104 queries in 0.75 s, zone 58.245.173.in-addr.arpa

;; FINDINGS
;  [INFO] 58.245.173.in-addr.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

;; RECORDS (authoritative, from jill.ns.cloudflare.com (173.245.58.122))
88.58.245.173.in-addr.arpa.	1800	IN	PTR	cruz.ns.cloudflare.com.

;; TRACE
;  88.58.245.173.in-addr.arpa PTR
;  . @l.root-servers.net (199.7.83.42) 5.9 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. @b.in-addr-servers.arpa (199.253.183.183) 5.7 ms [NOERROR qr]: referral to 173.in-addr.arpa.
173.in-addr.arpa.		NS	r.arin.net.	; 199.180.180.63 2001:500:f0::63
173.in-addr.arpa.		NS	u.arin.net.	; 204.61.216.50 2001:500:14:6050:ad::1
173.in-addr.arpa.		NS	x.arin.net.	; 199.180.180.63 2001:500:f0::63
173.in-addr.arpa.		NS	y.arin.net.	; 192.82.134.30 2001:500:127::30
173.in-addr.arpa.		NS	z.arin.net.	; 199.180.180.63 2001:500:f0::63
173.in-addr.arpa.		NS	arin.authdns.ripe.net.	; 193.0.9.10 2a13:27c0:30::10
173.in-addr.arpa.	86400	IN	DS	2062 8 2 494896D79DBED5BC05527F0A6C435DA6F331910CABF6F9E15C167350B47D22B8
;  173.in-addr.arpa. @x.arin.net (199.180.180.63) 92 ms [NOERROR qr]: referral to 58.245.173.in-addr.arpa.
58.245.173.in-addr.arpa.		NS	skip.ns.cloudflare.com.	; 108.162.193.233 172.64.33.233 173.245.59.233 2606:4700:58::adf5:3be9 2803:f800:50::6ca2:c1e9 2a06:98c1:50::ac40:21e9
58.245.173.in-addr.arpa.		NS	jill.ns.cloudflare.com.	; 108.162.192.122 172.64.32.122 173.245.58.122 2606:4700:50::adf5:3a7a 2803:f800:50::6ca2:c07a 2a06:98c1:50::ac40:207a
;  58.245.173.in-addr.arpa. @jill.ns.cloudflare.com (108.162.192.122) 7.1 ms [NOERROR qr aa]: answer
88.58.245.173.in-addr.arpa.	1800	IN	PTR	cruz.ns.cloudflare.com.

;; NAMESERVERS (SOA asked of each address)
;  jill.ns.cloudflare.com [parent+zone]
;    108.162.192.122                         ok                        2036765965  6.4 ms
;    172.64.32.122                           ok                        2036765965  6.8 ms
;    173.245.58.122                          ok                        2036765965  6.1 ms
;    2606:4700:50::adf5:3a7a                 ok                        2036765965  6.9 ms
;    2803:f800:50::6ca2:c07a                 ok                        2036765965  6.8 ms
;    2a06:98c1:50::ac40:207a                 ok                        2036765965  7.5 ms
;  skip.ns.cloudflare.com [parent+zone]
;    108.162.193.233                         ok                        2036765965  6.4 ms
;    172.64.33.233                           ok                        2036765965  6.3 ms
;    173.245.59.233                          ok                        2036765965  7.5 ms
;    2606:4700:58::adf5:3be9                 ok                        2036765965  6.7 ms
;    2803:f800:50::6ca2:c1e9                 ok                        2036765965  7.3 ms
;    2a06:98c1:50::ac40:21e9                 ok                        2036765965  6.5 ms

;; DNSSEC: unsigned

;; HOSTS
;  jill.ns.cloudflare.com (nameserver)
;    108.162.192.122                         PTR jill.ns.cloudflare.com (confirmed)
;    172.64.32.122                           PTR jill.ns.cloudflare.com (confirmed)
;    173.245.58.122                          PTR jill.ns.cloudflare.com (confirmed)
;    2606:4700:50::adf5:3a7a                 PTR jill.ns.cloudflare.com (confirmed)
;    2803:f800:50::6ca2:c07a                 PTR jill.ns.cloudflare.com (confirmed)
;    2a06:98c1:50::ac40:207a                 PTR jill.ns.cloudflare.com (confirmed)
;  skip.ns.cloudflare.com (nameserver)
;    108.162.193.233                         PTR skip.ns.cloudflare.com (confirmed)
;    172.64.33.233                           PTR skip.ns.cloudflare.com (confirmed)
;    173.245.59.233                          PTR skip.ns.cloudflare.com (confirmed)
;    2606:4700:58::adf5:3be9                 PTR skip.ns.cloudflare.com (confirmed)
;    2803:f800:50::6ca2:c1e9                 PTR skip.ns.cloudflare.com (confirmed)
;    2a06:98c1:50::ac40:21e9                 PTR skip.ns.cloudflare.com (confirmed)
;  cruz.ns.cloudflare.com (PTR target)
;    108.162.192.88                          PTR cruz.ns.cloudflare.com (confirmed)
;    172.64.32.88                            PTR cruz.ns.cloudflare.com (confirmed)
;    173.245.58.88                           PTR cruz.ns.cloudflare.com (confirmed)
;    2606:4700:50::adf5:3a58                 PTR cruz.ns.cloudflare.com (confirmed)
;    2803:f800:50::6ca2:c058                 PTR cruz.ns.cloudflare.com (confirmed)
;    2a06:98c1:50::ac40:2058                 PTR cruz.ns.cloudflare.com (confirmed)

;; PUBLIC RESOLVERS
;  Cloudflare PTR   cruz.ns.cloudflare.com.  ttl 1800
;  Google     PTR   cruz.ns.cloudflare.com.  ttl 1669
;  Quad9      PTR   cruz.ns.cloudflare.com.  ttl 1800
;  OpenDNS    PTR   cruz.ns.cloudflare.com.  ttl 1800