simplecast.com

Checked 22 October 2026, 10:43 UTC · via 8.8.8.8
!Passed with warnings
25 passed 2 warnings 0 failed 4 info

Registration

info

.com generic · Amazon Registrar, Inc. · expires 2027-07-06

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Amazon Registrar, Inc.
Registered
6 July 2004
Last changed
11 August 2026
Expires
6 July 2027
Status
client transfer prohibited
Registry nameservers
ns-1199.awsdns-21.org, ns-1668.awsdns-16.co.uk, ns-301.awsdns-37.com, ns-723.awsdns-26.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 2027-07-06 #3
    The registration is valid until 2027-07-06 (257 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-1199.awsdns-21.org, ns-1668.awsdns-16.co.uk, ns-301.awsdns-37.com, ns-723.awsdns-26.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns-1199.awsdns-21.org, ns-1668.awsdns-16.co.uk, ns-301.awsdns-37.com, ns-723.awsdns-26.net
NS in the zone
ns-1199.awsdns-21.org, ns-1668.awsdns-16.co.uk, ns-301.awsdns-37.com, ns-723.awsdns-26.net
NameserverAddressesNetwork (AS)Glue
ns-1199.awsdns-21.org205.251.196.175 2600:9000:5304:af00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-1668.awsdns-16.co.uk205.251.198.132 2600:9000:5306:8400::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-301.awsdns-37.com205.251.193.45 2600:9000:5301:2d00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US205.251.193.45 2600:9000:5301:2d00::1
ns-723.awsdns-26.net205.251.194.211 2600:9000:5302:d300::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-1199.awsdns-21.org, ns-1668.awsdns-16.co.uk, ns-301.awsdns-37.com, ns-723.awsdns-26.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-1199.awsdns-21.org 205.251.196.175NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-1199.awsdns-21.org 2600:9000:5304:af00::1NOERROR, 5 ms, authoritativenoyes / yesrefused-
ns-1668.awsdns-16.co.uk 205.251.198.132NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-1668.awsdns-16.co.uk 2600:9000:5306:8400::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-301.awsdns-37.com 205.251.193.45NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-301.awsdns-37.com 2600:9000:5301:2d00::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-723.awsdns-26.net 205.251.194.211NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-723.awsdns-26.net 2600:9000:5302:d300::1NOERROR, 5 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-301.awsdns-37.com

Found

Primary (MNAME)
ns-301.awsdns-37.com
Contact (RNAME)
cloud.simplecast.com
Serial
1
Refresh / retry
7200 s / 900 s
Expire
1209600 s
Negative TTL
86400 s

Serial per nameserver

NameserverSerial
ns-1199.awsdns-21.org (205.251.196.175)1
ns-1199.awsdns-21.org (2600:9000:5304:af00::1)1
ns-1668.awsdns-16.co.uk (205.251.198.132)1
ns-1668.awsdns-16.co.uk (2600:9000:5306:8400::1)1
ns-301.awsdns-37.com (205.251.193.45)1
ns-301.awsdns-37.com (2600:9000:5301:2d00::1)1
ns-723.awsdns-26.net (205.251.194.211)1
ns-723.awsdns-26.net (2600:9000:5302:d300::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-301.awsdns-37.com is one of the listed nameservers.
  • ✓ Contact cloud@simplecast.com #25
    The SOA RNAME cloud.simplecast.com means cloud@simplecast.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

25 records at the apex

Found

Read from
205.251.196.175:53
TypeValueTTL
SOAns-301.awsdns-37.com. cloud.simplecast.com. 1 7200 900 1209600 8640086400
NSns-1199.awsdns-21.org.172800
NSns-1668.awsdns-16.co.uk.172800
NSns-301.awsdns-37.com.172800
NSns-723.awsdns-26.net.172800
A199.60.103.18560
A199.60.103.8560
MX1 aspmx.l.google.com.86400
MX10 alt3.aspmx.l.google.com.86400
MX10 alt4.aspmx.l.google.com.86400
MX5 alt1.aspmx.l.google.com.86400
MX5 alt2.aspmx.l.google.com.86400
TXT"231-357-7434"60
TXT"E2ABBE35FD"60
TXT"MS=ms16561482"60
TXT"_globalsign-domain-verification=sixswoQSElSRftI3iQ54LD182s7Z0Z_QENlia5LMLs"60
TXT"d3ajex2kvszhwd.cloudfront.net"60
TXT"google-site-verification=aHmnCvB374EqhV8t0zOYSaNIGcSqS5ZAG-QKW3QFJP0"60
TXT"have-i-been-pwned-verification=e57f1a48bfd3156c42d2101e9cc798e8"60
TXT"keybase-site-verification=fBFFy6yD42yjioyDCD_D9RMI3of3ZB01SEDssLKUMFM"60
TXT"onetrust-domain-verification=8ce4239c2d794d05b5dea9293c37919b"60
TXT"onetrust-domain-verification=fcae5ffff31d4dda902b3e4bcd0ef707"60
TXT"postman-domain-verification=1cec4f8d082c7b4f2ce2c78c03fca7c9da3879181b5ece5436d3457ae6f6114fc2fc1c21a68ce87327a9a2bb5f2e1b4f52fb055f2cd260bcf66f1f14101cefd8"60
TXT"stripe-verification=46db797e734d25037c8a1966048d4d0a26f34600f23375c9ab8f1b327dc5b023"60
TXT"v=spf1 include:sendgrid.net include:servers.mcsv.net include:spf.mandrillapp.com include:_spf.google.com include:5139384.spf06.hubspotemail.net include:mail.zendesk.com ~all"60

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.
    #32
  • ✓ 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