smartbrief.com

Checked 22 October 2026, 10:44 UTC · via 8.8.8.8
!Passed with warnings
27 passed 1 warning 0 failed 3 info

Registration

info

.com generic · Lexsynergy Limited · expires 2027-06-02

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Lexsynergy Limited
Registered
2 June 1999
Last changed
3 May 2026
Expires
2 June 2027
Status
client delete prohibited, client transfer prohibited, client update prohibited
Registry nameservers
ns-1516.awsdns-61.org, ns-1609.awsdns-09.co.uk, ns-382.awsdns-47.com, ns-774.awsdns-32.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 2027-06-02 #3
    The registration is valid until 2027-06-02 (223 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

info

ns-1516.awsdns-61.org, ns-1609.awsdns-09.co.uk, ns-382.awsdns-47.com, ns-774.awsdns-32.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns-1516.awsdns-61.org, ns-1609.awsdns-09.co.uk, ns-382.awsdns-47.com, ns-774.awsdns-32.net
NS in the zone
ns-1516.awsdns-61.org, ns-1609.awsdns-09.co.uk, ns-382.awsdns-47.com, ns-774.awsdns-32.net
NameserverAddressesNetwork (AS)Glue
ns-1516.awsdns-61.org205.251.197.236 2600:9000:5305:ec00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-1609.awsdns-09.co.uk205.251.198.73 2600:9000:5306:4900::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-382.awsdns-47.com205.251.193.126 2600:9000:5301:7e00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US205.251.193.126 2600:9000:5301:7e00::1
ns-774.awsdns-32.net205.251.195.6 2600:9000:5303:600::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-1516.awsdns-61.org, ns-1609.awsdns-09.co.uk, ns-382.awsdns-47.com, ns-774.awsdns-32.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-1516.awsdns-61.org 205.251.197.236NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-1516.awsdns-61.org 2600:9000:5305:ec00::1NOERROR, 8 ms, authoritativenoyes / yesrefused-
ns-1609.awsdns-09.co.uk 205.251.198.73NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-1609.awsdns-09.co.uk 2600:9000:5306:4900::1NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns-382.awsdns-47.com 205.251.193.126NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-382.awsdns-47.com 2600:9000:5301:7e00::1NOERROR, 10 ms, authoritativenoyes / yesrefused-
ns-774.awsdns-32.net 205.251.195.6NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-774.awsdns-32.net 2600:9000:5303:600::1NOERROR, 8 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-1609.awsdns-09.co.uk

Found

Primary (MNAME)
ns-1609.awsdns-09.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-1516.awsdns-61.org (205.251.197.236)1
ns-1516.awsdns-61.org (2600:9000:5305:ec00::1)1
ns-1609.awsdns-09.co.uk (205.251.198.73)1
ns-1609.awsdns-09.co.uk (2600:9000:5306:4900::1)1
ns-382.awsdns-47.com (205.251.193.126)1
ns-382.awsdns-47.com (2600:9000:5301:7e00::1)1
ns-774.awsdns-32.net (205.251.195.6)1
ns-774.awsdns-32.net (2600:9000:5303:600::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-1609.awsdns-09.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

info

17 records at the apex

Found

Read from
205.251.197.236:53
TypeValueTTL
SOAns-1609.awsdns-09.co.uk. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400900
NSns-1516.awsdns-61.org.172800
NSns-1609.awsdns-09.co.uk.172800
NSns-382.awsdns-47.com.172800
NSns-774.awsdns-32.net.172800
A141.193.213.20300
A141.193.213.21300
MX10 corpmail.smartbrief.com.300
TXT"c4q83n1ci10sm4575gtpr7ntp3"300
TXT"facebook-domain-verification=yf9mnkugbque78djh484z44mkmzdab"300
TXT"globalsign-domain-verification=B449806DAABB063F0EA4421D71E2728B"300
TXT"globalsign-domain-verification=F4B916AC94E63A18B0175F4A24988C8C"300
TXT"google-site-verification=hSIjbroCEJRHm54jImz9HBKGY2WmGQ2RE0SvrmYiBAg"300
TXT"google-site-verification=xH1kY6rhcpWahVe41k9Ga6VuHrOr9-l68oDxF-bwr7A"300
TXT"google-site-verification=xmELWuiQrKVQirHo5Ad-GoZoMWVaX9RpZKyX9v1xWrw"300
TXT"v=spf1 include:_spf.smartbrief.com -all"300
TXT"yahoo-verification-key=C62JK6fMG9JqCam0KynIQZPje8GPGQEFfP7ZQ5hvEi8="300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 5m, NS 2d.
  • ✓ 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