leanpub.com

Checked 22 October 2026, 09:34 UTC · via 8.8.8.8
!Passed with warnings
26 passed 2 warnings 0 failed 3 info

Registration

info

.com generic · DreamHost, LLC · expires 2027-08-25

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
DreamHost, LLC
Registered
25 August 2009
Last changed
25 July 2026
Expires
25 August 2027
Status
client transfer prohibited
Registry nameservers
ns-1390.awsdns-45.org, ns-1693.awsdns-19.co.uk, ns-389.awsdns-48.com, ns-576.awsdns-08.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 2027-08-25 #3
    The registration is valid until 2027-08-25 (306 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-1390.awsdns-45.org, ns-1693.awsdns-19.co.uk, ns-389.awsdns-48.com, ns-576.awsdns-08.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns-1390.awsdns-45.org, ns-1693.awsdns-19.co.uk, ns-389.awsdns-48.com, ns-576.awsdns-08.net
NS in the zone
ns-1390.awsdns-45.org, ns-1693.awsdns-19.co.uk, ns-389.awsdns-48.com, ns-576.awsdns-08.net
NameserverAddressesNetwork (AS)Glue
ns-1390.awsdns-45.org205.251.197.110 2600:9000:5305:6e00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-1693.awsdns-19.co.uk205.251.198.157 2600:9000:5306:9d00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-389.awsdns-48.com205.251.193.133 2600:9000:5301:8500::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US205.251.193.133 2600:9000:5301:8500::1
ns-576.awsdns-08.net205.251.194.64 2600:9000:5302:4000::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-1390.awsdns-45.org, ns-1693.awsdns-19.co.uk, ns-389.awsdns-48.com, ns-576.awsdns-08.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-1390.awsdns-45.org 205.251.197.110NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-1390.awsdns-45.org 2600:9000:5305:6e00::1NOERROR, 8 ms, authoritativenoyes / yesrefused-
ns-1693.awsdns-19.co.uk 205.251.198.157NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-1693.awsdns-19.co.uk 2600:9000:5306:9d00::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-389.awsdns-48.com 205.251.193.133NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-389.awsdns-48.com 2600:9000:5301:8500::1NOERROR, 13 ms, authoritativenoyes / yesrefused-
ns-576.awsdns-08.net 205.251.194.64NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-576.awsdns-08.net 2600:9000:5302:4000::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-576.awsdns-08.net

Found

Primary (MNAME)
ns-576.awsdns-08.net
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-1390.awsdns-45.org (205.251.197.110)1
ns-1390.awsdns-45.org (2600:9000:5305:6e00::1)1
ns-1693.awsdns-19.co.uk (205.251.198.157)1
ns-1693.awsdns-19.co.uk (2600:9000:5306:9d00::1)1
ns-389.awsdns-48.com (205.251.193.133)1
ns-389.awsdns-48.com (2600:9000:5301:8500::1)1
ns-576.awsdns-08.net (205.251.194.64)1
ns-576.awsdns-08.net (2600:9000:5302:4000::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-576.awsdns-08.net 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

20 records at the apex

Found

Read from
205.251.197.110:53
TypeValueTTL
SOAns-576.awsdns-08.net. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400900
NSns-1390.awsdns-45.org.3600
NSns-1693.awsdns-19.co.uk.3600
NSns-389.awsdns-48.com.3600
NSns-576.awsdns-08.net.3600
A3.167.227.1060
A3.167.227.8660
A3.167.227.5760
A3.167.227.10160
AAAA2600:9000:27e6:7c00:6:744:8980:93a160
AAAA2600:9000:27e6:3200:6:744:8980:93a160
AAAA2600:9000:27e6:1600:6:744:8980:93a160
AAAA2600:9000:27e6:7600:6:744:8980:93a160
AAAA2600:9000:27e6:7000:6:744:8980:93a160
AAAA2600:9000:27e6:ea00:6:744:8980:93a160
AAAA2600:9000:27e6:a600:6:744:8980:93a160
AAAA2600:9000:27e6:5000:6:744:8980:93a160
MX0 aspmx.l.google.com.14400
TXT"google-site-verification=zoRXbAIm861EKd5VTW9pSjE9SmF0G12EWQit--QX-RI"300
TXT"v=spf1 a mx include:spf.mtasv.net include:spf.mail.intercom.io include:servers.mcsv.net include:_spf.google.com -all"300

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. The NS TTL at the parent is 2d and in the zone 1h; 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