Domain report: mercer.com

Registration

info

.com generic · MarkMonitor Inc. · expires 2027-01-06

Found

TLD: .com (generic)
ICANN policies apply: yes
Registrar: MarkMonitor Inc.
Registered: 7 January 1992
Last changed: 16 May 2026
Expires: 6 January 2027
Status: client delete prohibited, client transfer prohibited, client update prohibited
Registry nameservers: ns01.mmc.com, ns03.mmc.com, ns04.mmc.com, ns05.mmc.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 2027-01-06 #3

The registration is valid until 2027-01-06 (75 days).
✓ Transfer locked #4

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

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

Delegation

warn

ns01.mmc.com, ns03.mmc.com, ns04.mmc.com, ns05.mmc.com

Found

Parent zone: com
Delegation from: a.gtld-servers.net (192.5.6.30)
NS at the parent: ns01.mmc.com, ns03.mmc.com, ns04.mmc.com, ns05.mmc.com
NS in the zone: ns01.mmc.com, ns03.mmc.com, ns04.mmc.com, ns05.mmc.com

Nameserver	Addresses	Network (AS)	Glue
ns01.mmc.com	167.245.171.100	AS17161 MMC - Marsh Inc., US	167.245.171.100
ns03.mmc.com	205.156.137.100	AS17161 MMC - Marsh Inc., US	205.156.137.100
ns04.mmc.com	168.168.252.168	AS132481 MMCI-AS-AP - Marsh & McLennan Companies, Inc., AU	168.168.252.168
ns05.mmc.com	168.168.107.3	AS43949 MMC - Marsh Limited, GB	168.168.107.3

Checks

✓ 4 nameservers #6

Delegated to ns01.mmc.com, ns03.mmc.com, ns04.mmc.com, ns05.mmc.com.
✓ 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 4 IPv4 /24s and 0 IPv6 /48s.
✓ 3 autonomous systems #11

The nameservers are spread over: AS132481 (MMCI-AS-AP - Marsh & McLennan Companies, Inc., AU): 1 address; AS17161 (MMC - Marsh Inc., US): 2 addresses; AS43949 (MMC - Marsh Limited, GB): 1 address.
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

fail

4 of 4 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
ns01.mmc.com 167.245.171.100	NOERROR, 102 ms, authoritative	no	yes / yes	refused	-
ns03.mmc.com 205.156.137.100	NOERROR, 119 ms, authoritative	no	no / yes	refused	-
ns04.mmc.com 168.168.252.168	NOERROR, 293 ms, authoritative	no	yes / yes	refused	-
ns05.mmc.com 168.168.107.3	NOERROR, 29 ms, authoritative	no	yes / yes	refused	-

Checks

✓ All respond #14

All 4 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.
✗

No DNS over TCP

DNS over TCP is required (RFC 7766); without it, large answers such as DNSSEC responses fail. Not answering over TCP: ns03.mmc.com (205.156.137.100): read tcp 46.225.38.91:53676->205.156.137.100:53: read: connection reset by peer.

#19
✓ EDNS supported #20

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

All nameserver addresses are publicly routable.

SOA

info

serial 3012767178 · primary usash15-02dns01.mrshmc.com

Found

Primary (MNAME): usash15-02dns01.mrshmc.com
Contact (RNAME): internet.services.marsh.com
Serial: 3012767178
Refresh / retry: 3600 s / 360 s
Expire: 2419200 s
Negative TTL: 900 s

Serial per nameserver

Nameserver	Serial
ns01.mmc.com (167.245.171.100)	3012767178
ns03.mmc.com (205.156.137.100)	3012767178
ns04.mmc.com (168.168.252.168)	3012767178
ns05.mmc.com (168.168.107.3)	3012767178

Checks

✓ Serial 3012767178 everywhere #22

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

SOA refresh 1h, retry 6m, expire 28d, negative TTL 15m.
i

Hidden master

The primary nameserver usash15-02dns01.mrshmc.com is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.

#24
✓ Contact internet@services.marsh.com #25

The SOA RNAME internet.services.marsh.com means internet@services.marsh.com.
✓ Timestamp serial #26

The serial 3012767178 is a Unix timestamp (2065-06-20 23:46 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver: yes
Denial of existence: NSEC3
NSEC3: 10 iterations, 8-byte salt
Signatures valid until: 25 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
48239	RSASHA256 (8)	SHA256 E24274834C31FBD7…	yes
6349	RSASHA256 (8)	SHA256 C511EA1027C8B8C1…	NO

DNSKEY in the zone

Key tag	Role	Algorithm
48239	KSK (257)	RSASHA256 (8)
26824	ZSK (256)	RSASHA256 (8)
11631	ZSK (256)	RSASHA256 (8)

Checks

✓ Signed and validated #27

The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
i

Unused DS records

These DS records match no key in the zone: key tag 6349 (SHA256). That is normal during a key rollover; otherwise remove them.

#28
✓ Modern algorithms #29

Key algorithms: RSASHA256 (8).
✓ Short-lived signatures (online signing) #30

Signatures are valid for 96h0m0s and created on demand; the current one was made at 2026-10-21 17:17 UTC and expires at 2026-10-25 17:42 UTC.
!

NSEC3 with extra iterations or salt

NSEC3 uses 10 iterations and a 8-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

45 records at the apex

Found

Read from: 167.245.171.100:53

Type	Value	TTL
SOA	usash15-02dns01.mrshmc.com. internet.services.marsh.com. 3012767178 3600 360 2419200 900	1800
NS	ns04.mmc.com.	1800
NS	ns05.mmc.com.	1800
NS	ns01.mmc.com.	1800
NS	ns03.mmc.com.	1800
A	99.83.175.37	1800
A	75.2.75.65	1800
MX	5 mxb-001b7601.gslb.pphosted.com.	1800
MX	5 mxa-001b7601.gslb.pphosted.com.	1800
TXT	"amazonses:aCiVRigeZlgNHWmXXV22GYsbKu1vhHTlilAqWXnmNXw="	1800
TXT	"amazonses:hnPl8PNJbpVp0W++NoswWAv1yrdsr8VCOKAZJGYz6sU="	1800
TXT	"amazonses:qivjIz0fRIG1keT1RS0mwNx6GxOBkYlzqWII/R9Oy5E="	1800
TXT	"amazonses:iXzgzARIcXOHadXkYfMonJ1v8dNW6nVrUcVnAyK9IS8="	1800
TXT	"amazonses:3q0/I7caaG7HouBOy/z+1FrzmHhCg7spSRjm+apBLiw="	1800
TXT	"amazonses:6HO3F++S3FhT1fc/N5dJokSASuIm3kIW4HkK/YzUTrA="	1800
TXT	"amazonses:THfTObx7OagzcltbNtCkZsILhdowuArbhlfdwrx8u4E="	1800
TXT	"amazonses:" "RslWUhaNAa9sxHEmO3VvhcP8N+s+DI2Knc+nTDF7aA0="	1800
TXT	"Sendinblue-code:d3a0c8711febd69626dd0c139864a102"	1800
TXT	"amazonses:X5609EYVzFaD39mmId3zHNCKuej+8ZyKOn61AwM16io="	1800
TXT	"cloudhealth=337d4b65-e742-4106-94bd-38a09f2c1c31"	1800
TXT	"f2BI4sb/+goMm1VxoHtnWklA59gvAUtvlXMk4MIigdIdnGDSqTbMDq1730gBpYQSohBNQGkyM5nfZG36tfD5eA=="	1800
TXT	"smartsheet-site-validation=HmOVvd9f4qWQEdqBh3_QPoI5_9GH_7iY"	1800
TXT	"google-site-verification=EQJp9e00oXQcI7fi1XD8OAhryUqjHPWLu_Hkr105puQ"	1800
TXT	"v=spf1 include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~all"	1800
TXT	"z5Sf1u8JKpdMNw+GPePH+9qg8LjEpKw3QsWQMGu8Zud+Zm12J+awampjZo794lU7gd9VmWqrOmj3qwkOoTdsLg=="	1800
TXT	"U34xt/o6xcs6qLycsfwpeg3wo5ZXI5IizpOmu4QPRDgEAQv2W4UmXnN03AdRSApV8GCr0wy5K8qSSLf7hNKpyw=="	1800
TXT	"jamf-site-verification=lX4LjyZurtQaQy5tpmfrVg"	1800
TXT	"00DDH000000B5BK=1TBDH0000000002"	1800
TXT	"00DDJ000000AHAT=1TBDJ0000000006"	1800
TXT	"00DDn000002nia8=1TBDn0000004C98"	1800
TXT	"wiz-domain-verification=d0bf95814c9fa27b0adef5853d0fd78dd849e94cb81760b79ef05e85a94e3d87"	1800
TXT	"00D9h000004Jx0T=1TB9h0000000085"	1800
TXT	"00DQE0000000J2f=1TBOa00000000Pp"	1800
TXT	"zoho-verification=zb19570647.zmverify.zoho.com"	1800
TXT	"anthropic-domain-verification-ve1vdn=37euwGvFhVrJWYHhdH3dJ1CaR"	1800
TXT	"anthropic-domain-verification-fdpphm=DjzFeRZs6A5ujtjeWIYonKyP0"	1800
TXT	"Xmedius-Verification=3274b22ca5eae7f44f506725b9b96b98bb45d5874d26ae49ff4749db6763512e"	1800
TXT	"pendo-domain-verification=ouslkWgvo139UTxUCPBXDkW-djE"	1800
TXT	"apple-domain-verification=ORgRWY72EQi8FExU"	1800
TXT	"atlassian-domain-verification=xnXr01aGBaNvXPwRM4W0ttOcpdlCVf7kK4ca1XTG5iDuJhwcNjOZNCUDovUd25LP"	1800
TXT	"MS=ms17691168"	1800
TXT	"amazonses:gkSe82s8qfoGALMYbFfuElAOoM2lYUekea4J0qwXWXA="	1800
TXT	"amazonses:qiILK25lO9FhRNRaFDBuhVwxo/rLnwVyB4+gMJXlaUc="	1800
TXT	"amazonses:6aqKfzdaBm3WNCVUeU+a3qy+xD/EJcTQFm8q6IQ+U7k="	1800
TXT	"amazonses:uUS6WDSRp3TgacOqWr8In2F9dosA6ysAJ7lsz+uNfCg="	1800

Checks

✓ TTLs within range #32

TTLs: A 30m, MX 30m, NS 30m. The NS TTL at the parent is 2d and in the zone 30m; 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.
i

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