mimecast.com

Checked 22 October 2026, 09:51 UTC · via 8.8.8.8
!Passed with warnings
25 passed 3 warnings 0 failed 3 info

Registration

info

.com generic · MarkMonitor Inc. · expires 2032-12-13

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
MarkMonitor Inc.
Registered
20 February 2003
Last changed
12 November 2024
Expires
13 December 2032
Status
client delete prohibited, client transfer prohibited, client update prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers
dns01.mimecast.net, dns02.mimecast.net, dns03.mimecast.net, dns04.mimecast.net
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 2032-12-13 #3
    The registration is valid until 2032-12-13 (2244 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client transfer prohibited, client update 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

dns01.mimecast.net, dns02.mimecast.net, dns03.mimecast.net, dns04.mimecast.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
dns01.mimecast.net, dns02.mimecast.net, dns03.mimecast.net, dns04.mimecast.net
NS in the zone
dns01.mimecast.net, dns02.mimecast.net, dns03.mimecast.net, dns04.mimecast.net
NameserverAddressesNetwork (AS)Glue
dns01.mimecast.net185.58.87.12AS42427 MIMECAST-UK - Mimecast Services Limited, GB-
dns02.mimecast.net205.139.110.125AS30031 MIMECAST-US - Mimecast North America Inc, US-
dns03.mimecast.net195.130.217.24AS42427 MIMECAST-UK - Mimecast Services Limited, GB-
dns04.mimecast.net170.10.128.103AS30031 MIMECAST-US - Mimecast North America Inc, US-

Checks

  • ✓ 4 nameservers #6
    Delegated to dns01.mimecast.net, dns02.mimecast.net, dns03.mimecast.net, dns04.mimecast.net.
  • ✓ 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.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS30031 (MIMECAST-US - Mimecast North America Inc, US): 2 addresses; AS42427 (MIMECAST-UK - Mimecast Services Limited, GB): 2 addresses.
  • i
    All nameserver names under .net
    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

4 of 4 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns01.mimecast.net 185.58.87.12NOERROR, 17 ms, authoritativenoyes / yesrefused-
dns02.mimecast.net 205.139.110.125NOERROR, 78 ms, authoritativenoyes / yesrefused-
dns03.mimecast.net 195.130.217.24NOERROR, 16 ms, authoritativenoyes / yesrefused-
dns04.mimecast.net 170.10.128.103NOERROR, 90 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.
  • ✓ 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

warn

serial 1792606176 · primary dns01.mimecast.com

Found

Primary (MNAME)
dns01.mimecast.com
Contact (RNAME)
dns-admin.mimecast.com
Serial
1792606176
Refresh / retry
300 s / 300 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
dns01.mimecast.net (185.58.87.12)1792606176
dns02.mimecast.net (205.139.110.125)1792606176
dns03.mimecast.net (195.130.217.24)1792606176
dns04.mimecast.net (170.10.128.103)1792606176

Checks

  • ✓ Serial 1792606176 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    refresh 5m is outside 20m–1d; retry 5m should be shorter than refresh 5m. Current values: refresh 5m, retry 5m, expire 7d, negative TTL 1d.
    #23
  • i
    Hidden master
    The primary nameserver dns01.mimecast.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 dns-admin@mimecast.com #25
    The SOA RNAME dns-admin.mimecast.com means dns-admin@mimecast.com.
  • ✓ Timestamp serial #26
    The serial 1792606176 is a Unix timestamp (2026-10-21 18:09 UTC).

DNSSEC

warn

Not signed

Found

Validated by resolver
no

Checks

  • !
    Not signed
    The zone is not signed with DNSSEC, so answers can be spoofed. Enable DNSSEC at your DNS provider and publish the DS record at your registrar.
    #27

Records

pass

49 records at the apex

Found

Read from
185.58.87.12:53
TypeValueTTL
SOAdns01.mimecast.com. dns-admin.mimecast.com. 1792606176 300 300 604800 8640086400
NSdns02.mimecast.net.86400
NSdns01.mimecast.net.86400
NSdns04.mimecast.net.86400
NSdns03.mimecast.net.86400
A103.107.226.226300
MX10 service-alpha-inbound-b.mimecast.com.300
MX10 service-alpha-inbound-a.mimecast.com.300
TXT"docusign=a975f19c-4ea8-4d81-a277-b1c8eac0b50c"300
TXT"4xLha-tpX5JFdVtBWS5WC8jkjB1EEx5u"300
TXT"v=spf1 redirect=aojpw1q8._spf._d.mim.ec"300
TXT"cursor-domain-verification-6g4h1p=P7sNX6iIllfLVAwnNYVWUM05Z"300
TXT"docker-verification=cc508638-4f67-4486-8043-ce17243de5cc"300
TXT"miro-verification=962e0bf9f60f1a1fc2e48ccce0e009b7dd4ca754"300
TXT"_globalsign-domain-verification=GeBngTn9j8-utE2irGheYZSAXx6u5iGMQcd_tKlAgN"300
TXT"google-site-verification=QItWdZyz7z1CYXD0Gsx5_HXdktCfHjTBXEMOAF1Fo70"300
TXT"elevenlabs=CNrG00kC90Fqosh3bImrvlIinVqv5FgMhyY2mz0GxFc"300
TXT"google-site-verification=fedypP00EQfWF3QIChBj2kgHwODJEgMg1WUde21A-hE"300
TXT"kiro-site-verification=38d23567-b104-4a99-a5b3-56050f9ddb31"300
TXT"atlassian-sending-domain-verification=379b5e3d-d37e-4484-9b79-d643e25de749"300
TXT"drift-domain-verification=673004e7102db462b76d72b49a2aa2f0948de42f859e69fefebb034d73f9bccb"300
TXT"_8c3jko6yhagmu9aj0re99v35piez8mx"300
TXT"r9ffvqvn3lzqjntgng3b1n0tt1pdhs0w"300
TXT"_snmc0dy6yedgbxdtnag5bpm1j6m1c7m"300
TXT"gNg-j90w13dr-_ZlXyB6OcWL"300
TXT"kz87t95n047tq39ywhk4nysf9y1v1rdg"300
TXT"jamf-site-verification=Jit5-Uf2KqE-HlASlKZPyA"300
TXT"box-domain-verification=05b7e9a72c979ba0c07ca460b6daceecf4578ffa6b7dea530815794c934c917b"300
TXT"anthropic-domain-verification-r5xarz=7s5piFk2wCCr5jrOSwU9qEV6p"300
TXT"_bchwgepnjrsw3szh7bco05rkvnwyhgv"300
TXT"jttl8lbdwhvcgz26b4qjnr7vg3cjjmpr"300
TXT"_yclqkkax7f9kmspblryk24940cqh2t2"300
TXT"profound-domain-verification-bx7br7=ppYT4ro7Clm99RlbDEhxnv6K5"300
TXT"duo_sso_verification=ARujfCK13RBmfiGTUMzsraJDE6Kb1Yl549uRQOAFeQDMo6JkehyNoO9P3sXsmLdS"300
TXT"verification_token=DHXP0MNRGJ8zkiP247kDiLigk"300
TXT"figma-domain-verification=df1507af1380333d3aa590ac61423d853b53b56471355ae5c95d924f9fd8e6dc-1749476829"300
TXT"dhnhwx5y55g27sj1xrngkjd5n6bdlffl"300
TXT"atlassian-domain-verification=o46uxiY17PUJ2PcFuz9D4GTUr8f4eY895lZy8s22BZij9sEKkOThCKs+LwwzHUqP"300
TXT"google-site-verification=TCtQARZdwqYz00QUGEaqKG6TpDRPxLnA0xjvOr1L7WE"300
TXT"openai-domain-verification=dv-kiTJYEyO4rVQ19fE9DEp0rJl"300
TXT"MS=ms33346375"300
CAA0 issue "pki.goog"3600
CAA0 issuewild "amazonaws.com"3600
CAA0 issuewild "pki.goog"3600
CAA0 issue "letsencrypt.org"3600
CAA0 issuewild "digicert.com"3600
CAA0 issue "digicert.com"3600
CAA0 issue "amazonaws.com"3600
CAA0 issuewild "letsencrypt.org"3600

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 5m, NS 1d. The NS TTL at the parent is 2d and in the zone 1d; 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.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: pki.goog, amazonaws.com, letsencrypt.org, digicert.com.