tcs.com

Checked 22 October 2026, 10:55 UTC · via 8.8.8.8
!Passed with warnings
27 passed 4 warnings 0 failed 4 info

Registration

info

.com generic · Network Solutions, LLC · expires 2031-11-24

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Network Solutions, LLC
Registered
25 November 1997
Last changed
14 August 2026
Expires
24 November 2031
Status
client transfer prohibited
Registry nameservers
ns3.tcs.com, ns5.tcs.com, ns6.tcs.com, ns7.tcs.com, ns8.tcs.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 2031-11-24 #3
    The registration is valid until 2031-11-24 (1858 days).
  • ✓ Transfer locked #4
    Registry status: client transfer prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

warn

ns3.tcs.com, ns5.tcs.com, ns6.tcs.com, ns7.tcs.com, ns8.tcs.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns3.tcs.com, ns5.tcs.com, ns6.tcs.com, ns7.tcs.com, ns8.tcs.com
NS in the zone
ns3.tcs.com, ns5.tcs.com, ns6.tcs.com, ns7.tcs.com, ns8.tcs.com
NameserverAddressesNetwork (AS)Glue
ns3.tcs.com59.144.131.16AS9498 BBIL-AP - BHARTI Airtel Ltd., IN59.144.131.16
ns5.tcs.com208.44.114.53AS10753 LUMEN-LEGACY-L3-CUSTOMER-SHARED-USE - Level 3 Parent, LLC, US208.44.114.53
ns6.tcs.com80.82.129.169AS3257 GTT-BACKBONE - GTT Communications Inc., US80.82.129.169
ns7.tcs.com20.198.79.235AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US20.198.79.235
ns8.tcs.com45.249.218.123AS131265 TCS-ESERVE-AS-AP - TCS eServe Limited, IN45.249.218.123

Checks

  • ✓ 5 nameservers #6
    Delegated to ns3.tcs.com, ns5.tcs.com, ns6.tcs.com, ns7.tcs.com, ns8.tcs.com.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: ns3.tcs.com, ns5.tcs.com, ns6.tcs.com, ns7.tcs.com, ns8.tcs.com.
  • ✓ 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 5 IPv4 /24s and 0 IPv6 /48s.
  • ✓ 5 autonomous systems #11
    The nameservers are spread over: AS10753 (LUMEN-LEGACY-L3-CUSTOMER-SHARED-USE - Level 3 Parent, LLC, US): 1 address; AS131265 (TCS-ESERVE-AS-AP - TCS eServe Limited, IN): 1 address; AS3257 (GTT-BACKBONE - GTT Communications Inc., US): 1 address; AS8075 (MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US): 1 address; AS9498 (BBIL-AP - BHARTI Airtel Ltd., IN): 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

info

5 of 5 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns3.tcs.com 59.144.131.16NOERROR, 166 ms, authoritativenoyes / yesrefusedTCPWave DNS Server
ns5.tcs.com 208.44.114.53NOERROR, 195 ms, authoritativenoyes / yesrefusedTCPWave DNS Server
ns6.tcs.com 80.82.129.169NOERROR, 18 ms, authoritativenoyes / yesrefusedTCPWave DNS Server
ns7.tcs.com 20.198.79.235NOERROR, 124 ms, authoritativenoyes / yesrefusedTCPWave DNS Server
ns8.tcs.com 45.249.218.123NOERROR, 127 ms, authoritativenoyes / yesrefusedTCPWave DNS Server

Checks

  • ✓ All respond #14
    All 5 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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: ns3.tcs.com: "TCPWave DNS Server"; ns5.tcs.com: "TCPWave DNS Server"; ns6.tcs.com: "TCPWave DNS Server"; ns7.tcs.com: "TCPWave DNS Server"; ns8.tcs.com: "TCPWave DNS Server".
    #17
  • ✓ 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 2010065351 · primary ns8.tcs.com

Found

Primary (MNAME)
ns8.tcs.com
Contact (RNAME)
hostmaster.tcs.com
Serial
2010065351
Refresh / retry
43200 s / 3600 s
Expire
604800 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns3.tcs.com (59.144.131.16)2010065351
ns5.tcs.com (208.44.114.53)2010065351
ns6.tcs.com (80.82.129.169)2010065351
ns7.tcs.com (20.198.79.235)2010065351
ns8.tcs.com (45.249.218.123)2010065351

Checks

  • ✓ Serial 2010065351 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 12h, retry 1h, expire 7d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns8.tcs.com is one of the listed nameservers.
  • ✓ Contact hostmaster@tcs.com #25
    The SOA RNAME hostmaster.tcs.com means hostmaster@tcs.com.
  • ✓ Timestamp serial #26
    The serial 2010065351 is a Unix timestamp (2033-09-11 15:29 UTC).

DNSSEC

warn

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC3
NSEC3
50 iterations, 8-byte salt
Signatures valid until
23 October 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
23191RSASHA256 (8)SHA256 76AD90F318BA7FCD…yes
16145RSASHA256 (8)SHA256 0887F9ACEC5505C8…yes

DNSKEY in the zone

Key tagRoleAlgorithm
58213ZSK (256)RSASHA256 (8)
23191KSK (257)RSASHA256 (8)
16145KSK (257)RSASHA256 (8)
12088ZSK (256)RSASHA256 (8)

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 23191 (SHA256), key tag 16145 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: RSASHA256 (8).
  • !
    Signatures expire soon
    The earliest signature expires at 2026-10-23 23:48 UTC (in 37h0m0s). Check that automatic re-signing works.
    #30
  • !
    NSEC3 with extra iterations or salt
    NSEC3 uses 50 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

warn

40 records at the apex

Found

Read from
59.144.131.16:53
TypeValueTTL
SOAns8.tcs.com. hostmaster.tcs.com. 2010065351 43200 3600 604800 8640086400
NSns6.tcs.com.600
NSns3.tcs.com.600
NSns5.tcs.com.600
NSns7.tcs.com.600
NSns8.tcs.com.600
A4.247.162.660
MX10 uklong01.tcs.com.600
MX10 inchng04.tcs.com.600
MX10 inblrg03.tcs.com.600
MX10 inchng01.tcs.com.600
MX10 inmumg02.tcs.com.600
MX10 inchng02.tcs.com.600
MX10 Inmumg04.tcs.com.600
MX10 Inblrg04.tcs.com.600
MX10 Inblrg05.tcs.com.600
MX10 Inmumg05.tcs.com.600
MX10 inchng05.tcs.com.600
MX10 inmumg01.tcs.com.600
MX10 inblrg01.tcs.com.600
MX10 usnjyg01.tcs.com.600
TXT"jamf-site-verification=URyCd5Pt2yLRnv033HGe0w"86400
TXT"v=DKIM1; p=MHwwDQYJKoZIhvcNAQEBBQADawAwaAJhAMeGkE34XPTIZbdC9oFq7DQMxp1AP1K0Wz7H8+PYGes3WYV78Bh2xyveU+95RNnaA5OtTYXiUnoiTgi0KjiMdHgAWgGQf9FDHAywInYQnqAS0trZYXfPCzX9scywT07bCwIDAQAB"86400
TXT"openai-domain-verification=dv-AlVqlGpCYT4bxi0PFNJKSZX6"86400
TXT"knowbe4-site-verification=33e29214bb3d71505a751be27d46186c"86400
TXT"anthropic-domain-verification-tfn5n0=9GXTtZrfN5Um8FTf2LIV4xKo9"86400
TXT"slack-domain-verification=gJPx5KSyFWppNhT2UPPsKSl6j21ZXjAV2gVtsL9l"86400
TXT"mistral-domain-verification=fdd0813c9049cca307133795ea3a47958cde12b0"86400
TXT"MS=FB973537E0B451756257ED3A4605B1ACEE0A9488"86400
TXT"k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDFUlNZvtGDlIGDRtzyRQydM9yRInD5YMx86QpgZ3v7pT+Mx4tGbjUxY41TXbsp7UH9hTREaKKGQKNM/B3FzcFVv4zafZ09lUaXcbSdtD70iXyH0OXEGXLZI5gG0ZwjK5ptgQ18d+pUP9s8xMkJnZlubTk9MLvQnv3ZBzoL9FHFDQIDAQAB"86400
TXT"MS=ms45524606"86400
TXT"EE2C-4383-73B4-149E-352A-9FD0-A070-19D4"86400
TXT"cisco-ci-domain-verification=60247f24d2e754b3ef07e9bb4dd209ff541579fc73640ca2f6f0f67603a45224"86400
TXT"MQNFD2BSo2byT0Kju8LmoaiKjM3IPm1Br5e2+8c6z9t1ucfBMHRlAx5acE3jh1oHU4eYufqZRDRg2JGcEWJ2/w=="86400
TXT"apple-domain-verification=TbsJeWZcPNPWncXU"86400
TXT""86400
TXT"wiz-domain-verification=8ddbd6d698540cdb8a3aa0c04fa87feba7048c6e930f79b12f7bd33b015f9e76"86400
TXT"vmware-cloud-verification-de2ee9e3-5e26-4447-9b26-8a107dc3298a"86400
TXT"adobe-idp-site-verification=47703c1f53b23dfa3e31097050b545ab091495f205b154bd5a8d6cfd1b85a674"86400
TXT"v=spf1 include:_spf1.tcs.com include:_spf2.tcs.com include:_spf3.tcs.com include:_spf4.tcs.com include:mktomail.com -all"86400

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (1m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 2d and in the zone 10m; resolvers may use either.
    #32
  • ✓ 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