oliverwyman.com

Checked 22 October 2026, 10:05 UTC · via 8.8.8.8
✗Problems found
26 passed 2 warnings 1 failed 6 info

Registration

info

.com generic · MarkMonitor Inc. · expires 2026-11-24

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
MarkMonitor Inc.
Registered
25 November 1996
Last changed
16 May 2026
Expires
24 November 2026
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 2026-11-24 #3
    The registration is valid until 2026-11-24 (32 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
NameserverAddressesNetwork (AS)Glue
ns01.mmc.com167.245.171.100AS17161 MMC - Marsh Inc., US167.245.171.100
ns03.mmc.com205.156.137.100AS17161 MMC - Marsh Inc., US205.156.137.100
ns04.mmc.com168.168.252.168AS132481 MMCI-AS-AP - Marsh & McLennan Companies, Inc., AU168.168.252.168
ns05.mmc.com168.168.107.3AS43949 MMC - Marsh Limited, GB168.168.107.3

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

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns01.mmc.com 167.245.171.100NOERROR, 99 ms, authoritativenoyes / yesrefused-
ns03.mmc.com 205.156.137.100NOERROR, 119 ms, authoritativenono / yesrefused-
ns04.mmc.com 168.168.252.168NOERROR, 281 ms, authoritativenoyes / yesrefused-
ns05.mmc.com 168.168.107.3NOERROR, 26 ms, authoritativenoyes / yesrefused-

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 46.225.38.91:40384->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 3012113545 · primary usash15-02dns01.mrshmc.com

Found

Primary (MNAME)
usash15-02dns01.mrshmc.com
Contact (RNAME)
internet.services.marsh.com
Serial
3012113545
Refresh / retry
3600 s / 360 s
Expire
2419200 s
Negative TTL
900 s

Serial per nameserver

NameserverSerial
ns01.mmc.com (167.245.171.100)3012113545
ns03.mmc.com (205.156.137.100)3012113545
ns04.mmc.com (168.168.252.168)3012113545
ns05.mmc.com (168.168.107.3)3012113545

Checks

  • ✓ Serial 3012113545 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 3012113545 is a Unix timestamp (2065-06-13 10:12 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC3
NSEC3
10 iterations, 11-byte salt
Signatures valid until
26 October 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
32356RSASHA256 (8)SHA256 344D0B0AA3E125A0…NO
40660RSASHA256 (8)SHA256 D7A95B625CB9A99D…yes

DNSKEY in the zone

Key tagRoleAlgorithm
49179ZSK (256)RSASHA256 (8)
40660KSK (257)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 32356 (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 97h0m0s and created on demand; the current one was made at 2026-10-22 05:40 UTC and expires at 2026-10-26 06:29 UTC.
  • !
    NSEC3 with extra iterations or salt
    NSEC3 uses 10 iterations and a 11-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

58 records at the apex

Found

Read from
167.245.171.100:53
TypeValueTTL
SOAusash15-02dns01.mrshmc.com. internet.services.marsh.com. 3012113545 3600 360 2419200 900300
NSns04.mmc.com.300
NSns01.mmc.com.300
NSns05.mmc.com.300
NSns03.mmc.com.300
A75.2.75.65300
A99.83.175.37300
MX5 mxa-001b7601.gslb.pphosted.com.300
MX5 mxb-001b7601.gslb.pphosted.com.300
TXT"smartsheet-site-validation=gIZmGyw0URqZJ8qrqbm7zkiIcQlxVWKX"300
TXT"d365mktkey=pNJNQWTxkBxxFg9b2gFFMzKv8HP3UAP8MU1Gfw02csAx"300
TXT"d365mktkey=4PwItwQnRv9fx7We0gKizwHCXdXiQC6MdMwu5f7L8jkx"300
TXT"d365mktkey=xolmdnXJ8B7P5PSvStslB5ctHLRJmVkgmpWqxzRa1osx"300
TXT"d365mktkey=mXbQrBjSlxxeB4xncbH4F8khblmBDrUlW9Rmq3jdoUkx"300
TXT"mongodb-site-verification=zxJWtveJT2JPGUUHmeWrZHHZLsHA1ONl"300
TXT"apple-domain-verification=ZLClUFICLhpiqhDmnsNjW-8GShJc4QA1uJAdtGcqgvk"300
TXT"jamf-site-verification=Q73dDMIYC9twm1pxA0zkxA"300
TXT"wiz-domain-verification=d0bf95814c9fa27b0adef5853d0fd78dd849e94cb81760b79ef05e85a94e3d87"300
TXT"openai-domain-verification=dv-RhmyIAzfeZMMAxPyUdd9IbgO"300
TXT"mongodb-site-verification=TgqxdYexwkonIyV1aggXcGBXGhKVeltE"300
TXT"anthropic-domain-verification-dk71az=SiOozoevvoWwcfFv7yAe42CI0"300
TXT"Xmedius-Verification=432b0d8048ba66f233bf91e02a8d9c417a7137cf93600f29ab3f3806089faf41"300
TXT"aliyun-site-verification=fd4b77c1-54e6-4280-82c4-b3c28eb500e2"300
TXT"bettercomp-verify=90e78f9845e6f072bdab6a9b069fa188554f48869cdc62bc630e70e7320c6a50"300
TXT"TXT" "bettercomp-verify=7592302eb4892f34349b93047d56983c16c3a6e8c39992b1edbf896681ee8fbe"300
TXT"pendo-domain-verification=UkK1CwrBZI5d30eFR2Kp4W4jmSw"300
TXT"MS=ms57712237"300
TXT"PaRa1VmeRS5NZ1KVSC0YkJnY2xiIHKsFC3EFZ1yqTE150+LtBjS42CVrFCWnFLQUq+PNqpKo9Fi24OEDoiMq0w=="300
TXT"google-site-verification=CVmk0QNKpPs8k7ERM5o9J_amA7m0lDhDgYEGW_dFVBk"300
TXT"v=spf1 include:oliverwyman.com._nspf.vali.email include:%{i}._ip.%{h}._ehlo.%{d}._spf.vali.email ~all"300
TXT"amazonses:E7G71BR3pXpNUHzXSKMOg5gwel2FlW/PscEFRghJy5o="300
TXT"amazonses:YLqyGPcndHImABCXlvzb4Rw+ZuM7GFo8iJkkDDbsUOM="300
TXT"amazonses:TsX6PjwmI98qJvl/i7y/JzGSq8T5bqoUt+1YWZoZ5yw="300
TXT"adobe-idp-site-verification=913e4ed488bb8eccd8e2d2de5461f4ec10e6649b4d6410a4d03e0dabf4b522d2"300
TXT"7555-2436-2B5D-8348-5C6F-DC54-1E98-9338"300
TXT"atlassian-domain-verification=kL2zqrMecScA0giZK6mkRcLx4TTfBCdxGFJvG/N/jgvy+48MZUtjqaAEP/WMyJbN"300
TXT"atlassian-domain-verification=B5ipV+NJ90VqYy22o3me3cL4LPzBQUvt9d8ZTKjVDaQut9y15-lyKBDUHA/+lOc+"300
TXT"atlassian-domain-verification=XhzpsWO4hkFSmfq0vQD0GRSLnMpfrqlJ8-6l9sgZ9Ay/kDOQ6b/GfuhqnMc8ISEq"300
TXT"google-site-verification=v24gsjqk4p5ikld-drhxbz3c6yzp3dkfdzpugza8er4"300
TXT"onetrust-domain-verification=8409794f8bb34e0cabfa669a82b75934"300
TXT"mongodb-site-verification=yKRVKy1d0hfZoXyVKov6paa1IAv1A1Ba"300
TXT"docusign=f24d6ddc-ea9d-4b61-9454-277708341c81"300
TXT"d365mktkey=3nZPobVRZxnsUzxKXo9Qs9uzg0anwOwVoNqyW6CqGaAx"300
TXT"apple-domain-verification=EqE53jEJRpU3frgW"300
TXT"d365mktkey=2jJxsQ4jCuXQMhpX2s9COVPtPsm3QxUGILUKemY0efUx"300
TXT"cloudhealth=16c3f6ee-43ff-47d0-a8f8-1721d7669669"300
TXT"MS=ms32091866"300
TXT"d365mktkey=lXt6fVFDKDe6RgH3kNdItrRLJtxGyX0YFwrb4wrg3W8x"300
TXT"d365mktkey=nKGnzpgLmHxaxdU5iE7gjzfwlQrfioz7qFxGCsVSPEAx"300
TXT"d365mktkey=Bze8ezDlLNxD12nZkW7iRYkfDJ1e4hGe4DcruefllKQx"300
TXT"d365mktkey=4Ll51eEtskBKcOpSA3JjICCKUfo82IFxfMgcrQR8HNox"300
TXT"d365mktkey=xKKS0pxYS99Dbxu9gVHD6cy1EbmEG7i1eFhQyGDFk0Ux"300
TXT"d365mktkey=DArboQQUU83sDHObcms54NzKeNbI7GmrWJUKhfrdsV0x"300
TXT"cisco-ci-domain-verification=60a8990901776f889656bc47c2cb174750b2d59cda8eb460f72bac10aab1d046"300
TXT"v=BIMI1;" "l=https://www.oliverwyman.com/content/dam/oliver-wyman/v3/logos/OliverWyman_digital_avatar.svg;"300
TXT"mentimeter-8398ade3-bf9d-4f17-91d3-fc041b17777d"300
TXT"mongodb-site-verification=6IIJAoxZ6YataIyJjSp0jZ0XnYbGbsez"300
TXT"google-site-verification=1PUcHloD0JmvLl2QgsrWLI5ie2gh7tlbfwc7GMv-Zlg"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 5m, NS 5m. The NS TTL at the parent is 2d and in the zone 5m; resolvers may use either.
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • i
    Wildcard record
    A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.
    #34
  • 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