Domain report: randomhouse.com

Registration

info

.com generic · CSC Corporate Domains, Inc. · expires 2028-10-11

Found

TLD: .com (generic)
ICANN policies apply: yes
Registrar: CSC Corporate Domains, Inc.
Registered: 12 October 1993
Last changed: 7 October 2026
Expires: 11 October 2028
Status: client transfer prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers: ns1.prh.com, ns2.prh.com
RDAP server: https://rdap.verisign.com/com/v1/

Checks

i

.com is a generic TLD (gTLD)

Generic TLD under an ICANN registry agreement: ICANN-accredited registrars, UDRP and RDAP apply.

#1
✓ TLD delegated and signed #2

.com is delegated in the root zone and DNSSEC-signed.
✓ Expires on 2028-10-11 #3

The registration is valid until 2028-10-11 (719 days).
✓ Transfer locked #4

Registry status: client transfer prohibited, server delete prohibited, server transfer prohibited, server update prohibited.
✓ Registry and delegation match #5

The nameservers registered at the registry are the ones published in DNS.

Delegation

warn

ns1.prh.com, ns2.prh.com

Found

Parent zone: com
Delegation from: a.gtld-servers.net (192.5.6.30)
NS at the parent: ns1.prh.com, ns2.prh.com
NS in the zone: ns1.prh.com, ns2.prh.com

Nameserver	Addresses	Network (AS)	Glue
ns1.prh.com	107.162.234.197	AS55002 DEFENSE-NET - F5, Inc., US	107.162.234.197
ns2.prh.com	107.162.176.221	AS55002 DEFENSE-NET - F5, Inc., US	107.162.176.221

Checks

i

2 nameservers

Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: ns1.prh.com, ns2.prh.com.

#6
✓ Parent and zone agree #7

The parent delegation and the zone's NS records list the same nameservers.
✓ No glue needed #8

All nameservers are outside the zone, so no glue records are needed.
✓ All names resolve #9

Every nameserver name has an address and is not an alias.
✓ Nameservers in different networks #10

The nameservers are spread over 2 IPv4 /24s and 0 IPv6 /48s.
i

All nameservers in one AS

All nameserver addresses are announced by one network operator (AS55002 (DEFENSE-NET - F5, Inc., US): 2 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.

#11
i

All nameserver names under .com

All nameserver names are under one TLD, so a problem with that TLD also makes the nameservers unreachable. Some operators use names under two TLDs for extra resilience.

#12
!

No IPv6

None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.

#13

Nameservers

pass

2 of 2 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns1.prh.com 107.162.234.197	NOERROR, 9 ms, authoritative	no	yes / yes	refused	-
ns2.prh.com 107.162.176.221	NOERROR, 10 ms, authoritative	no	yes / yes	refused	-

Checks

✓ All respond #14

All 2 nameserver addresses answered.
✓ All authoritative #15

Every responding nameserver answers authoritatively for the zone.
✓ No recursion #16

The nameservers do not answer recursive queries for other domains.
✓ No version disclosed #17

The nameservers don't reveal their software version.
✓ Zone transfers refused #18

No nameserver allows a zone transfer to the public.
✓ TCP supported #19

All nameservers answer over TCP.
✓ EDNS supported #20

All nameservers support EDNS(0).
✓ Public addresses #21

All nameserver addresses are publicly routable.

SOA

pass

serial 806239 · primary ns1.prh.com

Found

Primary (MNAME): ns1.prh.com
Contact (RNAME): postmaster.randomhouse.com
Serial: 806239
Refresh / retry: 28800 s / 3600 s
Expire: 604800 s
Negative TTL: 28800 s

Serial per nameserver

Nameserver	Serial
ns1.prh.com (107.162.234.197)	806239
ns2.prh.com (107.162.176.221)	806239

Checks

✓ Serial 806239 everywhere #22

All nameservers serve the same version of the zone.
✓ Timers within recommendations #23

SOA refresh 8h, retry 1h, expire 7d, negative TTL 8h.
✓ Primary is a public nameserver #24

The primary nameserver ns1.prh.com is one of the listed nameservers.
✓ Contact postmaster@randomhouse.com #25

The SOA RNAME postmaster.randomhouse.com means postmaster@randomhouse.com.
✓ Counter serial #26

The serial 806239 is a plain counter.

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 10 iterations, 4-byte salt
Signatures valid until: 10 November 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
28139	ECDSAP256SHA256 (13)	SHA1 73A574B8204F6218…	yes
28139	ECDSAP256SHA256 (13)	SHA256 E4A60CF6A6CC8262…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
5709	ZSK (256)	RSASHA256 (8)
28139	KSK (257)	ECDSAP256SHA256 (13)

Checks

✓ Signed and validated #27

The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
✓ DS matches a key #28

The DS record at the parent matches a key in the zone: key tag 28139 (SHA1), key tag 28139 (SHA256).
✓ Modern algorithms #29

Key algorithms: ECDSAP256SHA256 (13), RSASHA256 (8).
✓ Signatures valid until 2026-11-10 #30

The earliest DNSKEY/SOA signature expires at 2026-11-10 13:13 UTC.
!

NSEC3 with extra iterations or salt

NSEC3 uses 10 iterations and a 4-byte salt. RFC 9276 recommends 0 iterations and no salt: extra iterations cost resolvers CPU and add no real protection, and some validators treat high counts as insecure.

#31

Records

info

16 records at the apex

Found

Read from: 107.162.234.197:53

Type	Value	TTL
SOA	ns1.prh.com. postmaster.randomhouse.com. 806239 28800 3600 604800 28800	600
NS	ns1.prh.com.	600
NS	ns2.prh.com.	600
A	170.171.208.12	600
MX	10 us-smtp-inbound-2.mimecast.com.	600
MX	10 us-smtp-inbound-1.mimecast.com.	600
TXT	"9p6r+17hOkZxqzw9YnQt5WnFkAdxglNU7NbMKWtDLIVdqAKH3yxzzO/ya681xc+i5K/bQiZcApmvQPjmNZYbEQ=="	600
TXT	"apple-domain-verification=yZTS6KwXN8ggGgKb"	600
TXT	"atlassian-domain-verification=Kl3ByU1tsfV9fKiC7TDDZYz1uCeTeUo0SSEh5SitZ9q99Ua74O571fgiIg//j5Hn"	600
TXT	"aq+sKMbT9943h3QSyo5+uII4luIxhbO3jB4lic8NRan8KPYsKxvbPXUIkf/39pgvxkmsLS+fsyY8gtU6l0BuHQ=="	600
TXT	"monday-com-verification=TT0Hb7qY-id2x_o-2OkWXSSLVpTxTADfmHwVAOcLHIk"	600
TXT	"globalsign-domain-verification=KaParXxs1OHDy7o8CMbPpHBN-2m_mzwdPqKMMQ66a6"	600
TXT	"qhp99ovh4or2b4ie7ju569mgla"	600
TXT	"6981mi0mv7p4b1rigrrut2ta94"	600
TXT	"v=spf1 include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~all"	600
TXT	"mMeYa24w85lzH0nHjojrOfMGlQcEy8UNTqASxsQNWXfiJQk/BiUD1OOz/Sck5v1sEZpHzKJrtxgZw/3trXwovQ=="	600

Checks

✓ TTLs within range #32

TTLs: A 10m, MX 10m, NS 10m. The NS TTL at the parent is 2d and in the zone 10m; resolvers may use either.
✓ No CNAME at the apex #33

The zone apex has no CNAME record.
✓ No wildcard #34

Names that don't exist return NXDOMAIN.
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No CAA records

Without CAA records any certificate authority may issue certificates for this domain. A CAA record limits issuance to the CAs you use.

#35