topcoder.com

Checked 22 October 2026, 11:11 UTC · via 8.8.8.8
!Passed with warnings
26 passed 2 warnings 0 failed 3 info

Registration

info

.com generic · Amazon Registrar, Inc. · expires 2026-12-30

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Amazon Registrar, Inc.
Registered
30 December 1998
Last changed
14 May 2026
Expires
30 December 2026
Status
client transfer prohibited
Registry nameservers
ns-1435.awsdns-51.org, ns-1916.awsdns-47.co.uk, ns-32.awsdns-04.com, ns-677.awsdns-20.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 2026-12-30 #3
    The registration is valid until 2026-12-30 (68 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

info

ns-1435.awsdns-51.org, ns-1916.awsdns-47.co.uk, ns-32.awsdns-04.com, ns-677.awsdns-20.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns-1435.awsdns-51.org, ns-1916.awsdns-47.co.uk, ns-32.awsdns-04.com, ns-677.awsdns-20.net
NS in the zone
ns-1435.awsdns-51.org, ns-1916.awsdns-47.co.uk, ns-32.awsdns-04.com, ns-677.awsdns-20.net
NameserverAddressesNetwork (AS)Glue
ns-1435.awsdns-51.org205.251.197.155 2600:9000:5305:9b00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-1916.awsdns-47.co.uk205.251.199.124 2600:9000:5307:7c00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-32.awsdns-04.com205.251.192.32 2600:9000:5300:2000::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US205.251.192.32 2600:9000:5300:2000::1
ns-677.awsdns-20.net205.251.194.165 2600:9000:5302:a500::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-1435.awsdns-51.org, ns-1916.awsdns-47.co.uk, ns-32.awsdns-04.com, ns-677.awsdns-20.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 4 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS16509 (AMAZON-02 - Amazon.com, Inc., US): 8 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • ✓ Nameserver names under 4 TLDs #12
    Nameserver names use the TLDs .com, .net, .org, .uk.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

pass

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns-1435.awsdns-51.org 205.251.197.155NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-1435.awsdns-51.org 2600:9000:5305:9b00::1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-1916.awsdns-47.co.uk 205.251.199.124NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-1916.awsdns-47.co.uk 2600:9000:5307:7c00::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-32.awsdns-04.com 205.251.192.32NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-32.awsdns-04.com 2600:9000:5300:2000::1NOERROR, 10 ms, authoritativenoyes / yesrefused-
ns-677.awsdns-20.net 205.251.194.165NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-677.awsdns-20.net 2600:9000:5302:a500::1NOERROR, 4 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 8 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 1 · primary ns-1916.awsdns-47.co.uk

Found

Primary (MNAME)
ns-1916.awsdns-47.co.uk
Contact (RNAME)
awsdns-hostmaster.amazon.com
Serial
1
Refresh / retry
7200 s / 900 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns-1435.awsdns-51.org (205.251.197.155)1
ns-1435.awsdns-51.org (2600:9000:5305:9b00::1)1
ns-1916.awsdns-47.co.uk (205.251.199.124)1
ns-1916.awsdns-47.co.uk (2600:9000:5307:7c00::1)1
ns-32.awsdns-04.com (205.251.192.32)1
ns-32.awsdns-04.com (2600:9000:5300:2000::1)1
ns-677.awsdns-20.net (205.251.194.165)1
ns-677.awsdns-20.net (2600:9000:5302:a500::1)1

Checks

  • ✓ Serial 1 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h, retry 15m, expire 14d, negative TTL 1d.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns-1916.awsdns-47.co.uk is one of the listed nameservers.
  • ✓ Contact awsdns-hostmaster@amazon.com #25
    The SOA RNAME awsdns-hostmaster.amazon.com means awsdns-hostmaster@amazon.com.
  • ✓ Counter serial #26
    The serial 1 is a plain counter.

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

warn

37 records at the apex

Found

Read from
205.251.197.155:53
TypeValueTTL
SOAns-1916.awsdns-47.co.uk. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400900
NSns-1435.awsdns-51.org.172800
NSns-1916.awsdns-47.co.uk.172800
NSns-32.awsdns-04.com.172800
NSns-677.awsdns-20.net.172800
A18.64.211.12260
A18.64.211.2060
A18.64.211.12660
A18.64.211.12860
AAAA2600:9000:20a2:6400:10:7d28:52c0:93a160
AAAA2600:9000:20a2:4800:10:7d28:52c0:93a160
AAAA2600:9000:20a2:6c00:10:7d28:52c0:93a160
AAAA2600:9000:20a2:1000:10:7d28:52c0:93a160
AAAA2600:9000:20a2:8e00:10:7d28:52c0:93a160
AAAA2600:9000:20a2:b000:10:7d28:52c0:93a160
AAAA2600:9000:20a2:7c00:10:7d28:52c0:93a160
AAAA2600:9000:20a2:4200:10:7d28:52c0:93a160
MX0 topcoder-com.mail.protection.outlook.com.360
TXT"MS=ms20073706"360
TXT"MS=ms23759231"360
TXT"MS=ms44288208"360
TXT"_globalsign-domain-verification=jXiWaCVO93prZlMVt6v8jbAryOZqlOXq62Qhr6m3RM"360
TXT"atlassian-domain-verification=+w2kTGdJUmIadT3Z6ZvXEscJ4Uy1ZzK8fAd9FkhHTX5dJB7o6ht83HGYFInN05iy"360
TXT"dls4pqf246mukrf72idavk9l3g"360
TXT"docusign=953f4549-607e-46f6-bf11-2cb19ce17157"360
TXT"google-site-verification=2mx-vBhouJ1CBg7zcfjojmXumIc9_ydV2CjySPifStk"360
TXT"google-site-verification=30UfLo5U-eaGkOC5qWNCDLOoMo5w5IALPwF60UpPHZ8"360
TXT"google-site-verification=5SodLKZzELdBw6825qNrjIGAktHnJa0LOXKi5450aTo"360
TXT"google-site-verification=I2-vokJxAW7yo94ZnfE5oPV8li8GmGwMHEWiMCA2rCQ"360
TXT"google-site-verification=P4bA6xyIh48pl3AS0TSwsCH9CMrQkeZOQ29fX81BSZI"360
TXT"growsurf=mn3hmp"360
TXT"h1-domain-verification=sKDFb5pWdrRSUVFAYavot1mDhMwC2ET1TyN26tgrMi5noc2G"360
TXT"mongodb-site-verification=6zXNzVaVQossZaSV8HTbJ3zmaUrPusCh"360
TXT"segment-site-verification=B6OW8Cqms9KaRs3DpqnieB26cJIepPKr"360
TXT"status-page-domain-verification=w978dxn9smwn"360
TXT"unbounce=381395"360
TXT"v=spf1 ip4:54.165.99.226/32 ip4:34.235.47.21/32 ip4:10.25.35.223/32 include:mail.zendesk.com include:servers.mcsv.net include:stspg-customer.com include:_spf.salesforce.com include:spf.protection.outlook.com include:43994671.spf05.hubspotemail.net -all"360

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (1m), AAAA (1m). Low TTLs are useful just before a planned change.
    #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