penguinlibros.com

Checked 22 October 2026, 10:13 UTC · via 8.8.8.8
!Passed with warnings
26 passed 1 warning 0 failed 4 info

Registration

info

.com generic · Nominalia Internet SL · expires 2027-05-14

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Nominalia Internet SL
Registered
14 May 2020
Last changed
11 March 2026
Expires
14 May 2027
Status
active
Registry nameservers
ns-1053.awsdns-03.org, ns-2017.awsdns-60.co.uk, ns-26.awsdns-03.com, ns-983.awsdns-58.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 2027-05-14 #3
    The registration is valid until 2027-05-14 (204 days).
  • i
    No transfer lock
    The domain has no transfer lock (status: active). A registrar lock protects against unauthorized transfers.
    #4
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

ns-1053.awsdns-03.org, ns-2017.awsdns-60.co.uk, ns-26.awsdns-03.com, ns-983.awsdns-58.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns-1053.awsdns-03.org, ns-2017.awsdns-60.co.uk, ns-26.awsdns-03.com, ns-983.awsdns-58.net
NS in the zone
ns-1053.awsdns-03.org, ns-2017.awsdns-60.co.uk, ns-26.awsdns-03.com, ns-983.awsdns-58.net
NameserverAddressesNetwork (AS)Glue
ns-1053.awsdns-03.org205.251.196.29 2600:9000:5304:1d00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-2017.awsdns-60.co.uk205.251.199.225 2600:9000:5307:e100::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-
ns-26.awsdns-03.com205.251.192.26 2600:9000:5300:1a00::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US205.251.192.26 2600:9000:5300:1a00::1
ns-983.awsdns-58.net205.251.195.215 2600:9000:5303:d700::1AS16509 AMAZON-02 - Amazon.com, Inc., US AS16509 AMAZON-02 - Amazon.com, Inc., US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns-1053.awsdns-03.org, ns-2017.awsdns-60.co.uk, ns-26.awsdns-03.com, ns-983.awsdns-58.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-1053.awsdns-03.org 205.251.196.29NOERROR, 3 ms, authoritativenoyes / yesrefused-
ns-1053.awsdns-03.org 2600:9000:5304:1d00::1NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-2017.awsdns-60.co.uk 205.251.199.225NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-2017.awsdns-60.co.uk 2600:9000:5307:e100::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-26.awsdns-03.com 205.251.192.26NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-26.awsdns-03.com 2600:9000:5300:1a00::1NOERROR, 9 ms, authoritativenoyes / yesrefused-
ns-983.awsdns-58.net 205.251.195.215NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns-983.awsdns-58.net 2600:9000:5303:d700::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-1053.awsdns-03.org

Found

Primary (MNAME)
ns-1053.awsdns-03.org
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-1053.awsdns-03.org (205.251.196.29)1
ns-1053.awsdns-03.org (2600:9000:5304:1d00::1)1
ns-2017.awsdns-60.co.uk (205.251.199.225)1
ns-2017.awsdns-60.co.uk (2600:9000:5307:e100::1)1
ns-26.awsdns-03.com (205.251.192.26)1
ns-26.awsdns-03.com (2600:9000:5300:1a00::1)1
ns-983.awsdns-58.net (205.251.195.215)1
ns-983.awsdns-58.net (2600:9000:5303:d700::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-1053.awsdns-03.org 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

22 records at the apex

Found

Read from
205.251.196.29:53
TypeValueTTL
SOAns-1053.awsdns-03.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400900
NSns-1053.awsdns-03.org.172800
NSns-2017.awsdns-60.co.uk.172800
NSns-26.awsdns-03.com.172800
NSns-983.awsdns-58.net.172800
A45.223.25.1300
A45.223.19.1300
MX10 us-smtp-inbound-1.mimecast.com.300
MX11 us-smtp-inbound-2.mimecast.com.300
TXT"MS=ms78140808"300
TXT"_globalsign-domain-verification=eLn9AbmqV0XU4dL65zq0HpAvKrN-v78BFbgQ_0feQC" "MP4EAFS787UI5RVKLPDKH23DIA"300
TXT"c0cb2b7j4oio9ai4t0dn5gp08t"300
TXT"fdh5voa85tc398go6f00tsipjl"300
TXT"globalsign-domain-verification=2BC343CC5B604CB5D79D6252D4614600"300
TXT"globalsign-domain-verification=2a3c396aad6e5c57e8568c40501dca5e"300
TXT"globalsign-domain-verification=7439B1FF310B92BBFA9EBB9B9D206D1D"300
TXT"globalsign-domain-verification=8BD5675959F611BD06FF5B580080D2E3"300
TXT"globalsign-domain-verification=9ACE166E6DD393A2110DDFAE14E703D3"300
TXT"globalsign-domain-verification=d8688adbe18411ee1a23b704da1e9341"300
TXT"rss743nrddb2h0nk1j2o6orhp3"300
TXT"v=spf1 include:spf.protection.outlook.com include:amazonses.com -all"300
TXT"z6q2n9v.x.incapdns.net"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