packtpub.com

Checked 22 October 2026, 10:11 UTC · via 8.8.8.8
!Passed with warnings
29 passed 1 warning 0 failed 5 info

Registration

info

.com generic · Amazon Registrar, Inc. · expires 2027-05-09

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Amazon Registrar, Inc.
Registered
9 May 2003
Last changed
16 May 2026
Expires
9 May 2027
Status
client transfer prohibited
Registry nameservers
eva.ns.cloudflare.com, max.ns.cloudflare.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 2027-05-09 #3
    The registration is valid until 2027-05-09 (199 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

eva.ns.cloudflare.com, max.ns.cloudflare.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
eva.ns.cloudflare.com, max.ns.cloudflare.com
NS in the zone
eva.ns.cloudflare.com, max.ns.cloudflare.com
NameserverAddressesNetwork (AS)Glue
eva.ns.cloudflare.com108.162.192.114 173.245.58.114 172.64.32.114 2606:4700:50::adf5:3a72 2803:f800:50::6ca2:c072 2a06:98c1:50::ac40:2072AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US108.162.192.114 172.64.32.114 173.245.58.114 2606:4700:50::adf5:3a72 2803:f800:50::6ca2:c072 2a06:98c1:50::ac40:2072
max.ns.cloudflare.com108.162.193.132 173.245.59.132 172.64.33.132 2a06:98c1:50::ac40:2184 2803:f800:50::6ca2:c184 2606:4700:58::adf5:3b84AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US AS13335 CLOUDFLARENET - Cloudflare, Inc., US108.162.193.132 172.64.33.132 173.245.59.132 2606:4700:58::adf5:3b84 2803:f800:50::6ca2:c184 2a06:98c1:50::ac40:2184

Checks

  • i
    2 nameservers
    Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: eva.ns.cloudflare.com, max.ns.cloudflare.com.
    #6
  • ✓ 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 6 IPv4 /24s and 4 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS13335 (CLOUDFLARENET - Cloudflare, Inc., US): 12 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.
    #11
  • 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
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

12 of 12 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
eva.ns.cloudflare.com 108.162.192.114NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
eva.ns.cloudflare.com 173.245.58.114NOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
eva.ns.cloudflare.com 172.64.32.114NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
eva.ns.cloudflare.com 2606:4700:50::adf5:3a72NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
eva.ns.cloudflare.com 2803:f800:50::6ca2:c072NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
eva.ns.cloudflare.com 2a06:98c1:50::ac40:2072NOERROR, 6 ms, authoritativenoyes / yesrefused2026.10.2
max.ns.cloudflare.com 108.162.193.132NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
max.ns.cloudflare.com 173.245.59.132NOERROR, 9 ms, authoritativenoyes / yesrefused2026.10.2
max.ns.cloudflare.com 172.64.33.132NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
max.ns.cloudflare.com 2a06:98c1:50::ac40:2184NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
max.ns.cloudflare.com 2803:f800:50::6ca2:c184NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2
max.ns.cloudflare.com 2606:4700:58::adf5:3b84NOERROR, 5 ms, authoritativenoyes / yesrefused2026.10.2

Checks

  • ✓ All respond #14
    All 12 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.
  • !
    Software version disclosed
    These nameservers report their software version via version.bind/version.server, which helps attackers find known vulnerabilities: eva.ns.cloudflare.com: "2026.10.2"; max.ns.cloudflare.com: "2026.10.2". Hide or replace the version string.
    #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 2417471761 · primary eva.ns.cloudflare.com

Found

Primary (MNAME)
eva.ns.cloudflare.com
Contact (RNAME)
dns.cloudflare.com
Serial
2417471761
Refresh / retry
10000 s / 2400 s
Expire
604800 s
Negative TTL
1800 s

Serial per nameserver

NameserverSerial
eva.ns.cloudflare.com (108.162.192.114)2417471761
eva.ns.cloudflare.com (173.245.58.114)2417471761
eva.ns.cloudflare.com (172.64.32.114)2417471761
eva.ns.cloudflare.com (2606:4700:50::adf5:3a72)2417471761
eva.ns.cloudflare.com (2803:f800:50::6ca2:c072)2417471761
eva.ns.cloudflare.com (2a06:98c1:50::ac40:2072)2417471761
max.ns.cloudflare.com (108.162.193.132)2417471761
max.ns.cloudflare.com (173.245.59.132)2417471761
max.ns.cloudflare.com (172.64.33.132)2417471761
max.ns.cloudflare.com (2a06:98c1:50::ac40:2184)2417471761
max.ns.cloudflare.com (2803:f800:50::6ca2:c184)2417471761
max.ns.cloudflare.com (2606:4700:58::adf5:3b84)2417471761

Checks

  • ✓ Serial 2417471761 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h46m40s, retry 40m, expire 7d, negative TTL 30m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver eva.ns.cloudflare.com is one of the listed nameservers.
  • ✓ Contact dns@cloudflare.com #25
    The SOA RNAME dns.cloudflare.com means dns@cloudflare.com.
  • ✓ Timestamp serial #26
    The serial 2417471761 is a Unix timestamp (2046-08-09 23:56 UTC).

DNSSEC

info

Signed, DS published at parent

Found

Validated by resolver
yes
Denial of existence
NSEC
Signatures valid until
23 October 2026

DS at the parent

Key tagAlgorithmDigestMatches a key
2371ECDSAP256SHA256 (13)SHA256 164829D1F36A57B6…yes

DNSKEY in the zone

Key tagRoleAlgorithm
2371KSK (257)ECDSAP256SHA256 (13)
34505ZSK (256)ECDSAP256SHA256 (13)

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 2371 (SHA256).
  • ✓ Modern algorithms #29
    Key algorithms: ECDSAP256SHA256 (13).
  • ✓ Short-lived signatures (online signing) #30
    Signatures are valid for 50h0m0s and created on demand; the current one was made at 2026-10-21 09:11 UTC and expires at 2026-10-23 11:11 UTC.
  • i
    NSEC
    The zone uses NSEC, so its full contents can be listed by walking the NSEC chain. That is fine unless the names are sensitive.
    #31

Records

pass

30 records at the apex

Found

Read from
108.162.192.114:53
TypeValueTTL
SOAeva.ns.cloudflare.com. dns.cloudflare.com. 2417471761 10000 2400 604800 18001800
NSeva.ns.cloudflare.com.86400
NSmax.ns.cloudflare.com.86400
A104.18.18.57300
A104.18.19.57300
AAAA2606:4700::6812:1239300
AAAA2606:4700::6812:1339300
MX0 packtpub-com.mail.protection.outlook.com.300
TXT"MS=ms77079791"300
TXT"_globalsign-domain-verification=6RYPIPUO2OQDU0pqaDmaEeWmISV7Tz3QQBCYgOv3br"300
TXT"_globalsign-domain-verification=HYZk2Fhot5-PhJD3xTIrZBWcnuIiOpkPMyjRmQ2z5L"300
TXT"_globalsign-domain-verification=Iiihy-iv_vLdlIMtHvh-aCdqO2T53oCoknhW44njXn"300
TXT"facebook-domain-verification=m4iqhvdyzgnt1rtxtdfzrsypf63gi8"300
TXT"google-gws-recovery-domain-verification=67085002"300
TXT"google-site-verification=4IqRPigqD2-cUnB7oyC8vW9hJVPD-1CklhbG2CzYcKk"300
TXT"google-site-verification=EhrsgJ1xswy57ujWukxssZc7LkxKzr_k5GCWDF68sgk"300
TXT"google-site-verification=aYn6H9fduNTMAWna17iNt1G1VNPxaakxn2Vta5qgok0"300
TXT"v=spf1 a:zgateway.zuora.com include:spf.protection.outlook.com include:servers.mcsv.net include:spf.mandrillapp.com include:sendgrid.net include:amazonses.com -all"300
CAA0 iodef "mailto:caa.notification@packt.com"300
CAA0 issue "amazon.com"300
CAA0 issue "amazonaws.com"300
CAA0 issue "amazontrust.com"300
CAA0 issue "awstrust.com"300
CAA0 issue "letsencrypt.org"300
CAA0 issue "pki.goog; cansignhttpexchanges=yes"300
CAA0 issuewild "amazon.com"300
CAA0 issuewild "amazonaws.com"300
CAA0 issuewild "amazontrust.com"300
CAA0 issuewild "awstrust.com"300
CAA0 issuewild "letsencrypt.org"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, AAAA 5m, MX 5m, NS 1d. The NS TTL at the parent is 2d and in the zone 1d; resolvers may use either.
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • ✓ No wildcard #34
    Names that don't exist return NXDOMAIN.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: amazon.com, amazonaws.com, amazontrust.com, awstrust.com, letsencrypt.org, pki.goog.