travelzoo.com

Checked 22 October 2026, 11:12 UTC · via 8.8.8.8
!Passed with warnings
20 passed 5 warnings 0 failed 6 info

Registration

info

.com generic · Network Solutions, LLC · expires 2031-01-25

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Network Solutions, LLC
Registered
26 January 1998
Last changed
26 November 2025
Expires
25 January 2031
Status
client transfer prohibited
Registry nameservers
asia4.akam.net, eur1.akam.net, eur4.akam.net, ns1-225.akam.net, ns1-245.akam.net, usc2.akam.net, use4.akam.net, use9.akam.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 2031-01-25 #3
    The registration is valid until 2031-01-25 (1555 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

warn

asia4.akam.net, eur1.akam.net, eur4.akam.net, ns1-225.akam.net, ns1-245.akam.net, usc2.akam.net, use4.akam.net, use9.akam.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
asia4.akam.net, eur1.akam.net, eur4.akam.net, ns1-225.akam.net, ns1-245.akam.net, usc2.akam.net, use4.akam.net, use9.akam.net
NS in the zone
asia4.akam.net, eur1.akam.net, eur4.akam.net, ns1-225.akam.net, ns1-245.akam.net, usc2.akam.net, use9.akam.net
NameserverAddressesNetwork (AS)Glue
asia4.akam.net184.85.248.64AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
eur1.akam.net2.16.130.64AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
eur4.akam.net84.53.139.64AS20940 AKAMAI-ASN1 - Akamai International B.V., NL-
ns1-225.akam.net193.108.91.225 2600:1401:2::e1AS20940 AKAMAI-ASN1 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
ns1-245.akam.net193.108.91.245 2600:1401:2::f5AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
usc2.akam.net184.26.160.64AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
use4.akam.net (parent only)23.211.133.65AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
use9.akam.net72.246.46.65AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-

Checks

  • ✓ 8 nameservers #6
    Delegated to asia4.akam.net, eur1.akam.net, eur4.akam.net, ns1-225.akam.net, ns1-245.akam.net, usc2.akam.net, use4.akam.net, use9.akam.net.
  • !
    NS sets differ
    The nameservers at the parent and in the zone should be the same. Only at the parent: use4.akam.net. asia4.akam.net, eur1.akam.net, eur4.akam.net, ns1-225.akam.net, ns1-245.akam.net, usc2.akam.net, use4.akam.net, use9.akam.net report NS asia4.akam.net eur1.akam.net eur4.akam.net ns1-225.akam.net ns1-245.akam.net usc2.akam.net use9.akam.net.
    #7
  • ✓ 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.
  • i
    One address family in one network
    all IPv6 addresses are in 2600:1401:2::/48, while the other address family is spread over several networks.
    #10
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS20940 (AKAMAI-ASN1 - Akamai International B.V., NL): 2 addresses; AS21342 (AKAMAI-ASN2 - Akamai International B.V., NL): 8 addresses.
  • i
    All nameserver names under .net
    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
  • i
    Partly IPv6
    These nameservers have no IPv6 address: asia4.akam.net, eur1.akam.net, eur4.akam.net, usc2.akam.net, use4.akam.net, use9.akam.net.
    #13

Nameservers

warn

10 of 10 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
asia4.akam.net 184.85.248.64NOERROR, 4 ms, authoritativenoyes / yesrefused41824.8
eur1.akam.net 2.16.130.64NOERROR, 3 ms, authoritativenoyes / yesrefused48878.29
eur4.akam.net 84.53.139.64NOERROR, 3 ms, authoritativenoyes / yesrefused41824.6
ns1-225.akam.net 193.108.91.225NOERROR, 3 ms, authoritativenoyes / yesrefused41824.8
ns1-225.akam.net 2600:1401:2::e1NOERROR, 4 ms, authoritativenoyes / yesrefused41824.6
ns1-245.akam.net 193.108.91.245NOERROR, 4 ms, authoritativenoyes / yesrefused41824.5
ns1-245.akam.net 2600:1401:2::f5NOERROR, 4 ms, authoritativenoyes / yesrefused41824.8
usc2.akam.net 184.26.160.64NOERROR, 3 ms, authoritativenoyes / yesrefused48878.29
use4.akam.net 23.211.133.65NOERROR, 4 ms, authoritativenoyes / yesrefused48878.31
use9.akam.net 72.246.46.65NOERROR, 4 ms, authoritativenoyes / yesrefused48878.32

Checks

  • ✓ All respond #14
    All 10 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: asia4.akam.net: "41824.8"; eur1.akam.net: "48878.29"; eur4.akam.net: "41824.6"; ns1-225.akam.net: "41824.8"; ns1-225.akam.net: "41824.6"; ns1-245.akam.net: "41824.5"; ns1-245.akam.net: "41824.8"; usc2.akam.net: "48878.29"; use4.akam.net: "48878.31"; use9.akam.net: "48878.32". 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

warn

serial 2017034717 · primary ns1.travelzoo.com

Found

Primary (MNAME)
ns1.travelzoo.com
Contact (RNAME)
sledwith.travelzoo.com
Serial
2017034717
Refresh / retry
90 s / 300 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
asia4.akam.net (184.85.248.64)2017034717
eur1.akam.net (2.16.130.64)2017034717
eur4.akam.net (84.53.139.64)2017034717
ns1-225.akam.net (193.108.91.225)2017034717
ns1-225.akam.net (2600:1401:2::e1)2017034717
ns1-245.akam.net (193.108.91.245)2017034717
ns1-245.akam.net (2600:1401:2::f5)2017034717
usc2.akam.net (184.26.160.64)2017034717
use4.akam.net (23.211.133.65)2017034717
use9.akam.net (72.246.46.65)2017034717

Checks

  • ✓ Serial 2017034717 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    refresh 1m30s is outside 20m–1d; retry 5m should be shorter than refresh 1m30s. Current values: refresh 1m30s, retry 5m, expire 7d, negative TTL 1h.
    #23
  • i
    Hidden master
    The primary nameserver ns1.travelzoo.com is not listed as a nameserver: a hidden master that only feeds the public secondaries. That is a common setup; make sure it is not reachable for zone transfers from outside.
    #24
  • ✓ Contact sledwith@travelzoo.com #25
    The SOA RNAME sledwith.travelzoo.com means sledwith@travelzoo.com.
  • ✓ Timestamp serial #26
    The serial 2017034717 is a Unix timestamp (2033-12-01 07:25 UTC).

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

41 records at the apex

Found

Read from
184.85.248.64:53
TypeValueTTL
SOAns1.travelzoo.com. sledwith.travelzoo.com. 2017034717 90 300 604800 36003600
NSeur1.akam.net.900
NSasia4.akam.net.900
NSuse9.akam.net.900
NSns1-245.akam.net.900
NSns1-225.akam.net.900
NSusc2.akam.net.900
NSeur4.akam.net.900
A23.212.202.3520
MX10 us-smtp-inbound-1.mimecast.com.3600
MX10 us-smtp-inbound-2.mimecast.com.3600
TXT"_ir6qi25c7q13zzqqhvyqa3zem4h6dsv"300
TXT"v=spf1 redirect=5dwfy4wb._spf._d.mim.ec"300
TXT"google-site-verification=O63TqmWc4RFATA4Nd3trHy7SYWn2BCO7Ki_s_Gda99Q"300
TXT"MS=ms97771573"300
TXT"apple-domain-verification=xjWroF10NugkZIlc"300
TXT"google-site-verification=ecsToGQMyi3RmNaVahrNuIbqHZf5W6Q6IAiPOneSRbA"300
TXT"google-site-verification=7yfwdJCRDkvs81H70gzrFy3v7pDN_A8YKIV2UYmi4CM"300
TXT"_va3t8p0h0y712rjbodmc7vryyb0k5rw"300
TXT"mandrill_verify.vWM3FqfslAH67A7IWu7dRw"300
TXT"facebook-domain-verification=o15g6gqh0yditi47n49kmlf8wxqx8w"300
TXT"google-site-verification=hoNzBddRU4JF5EtLSS-D4w51IZ7yXDo2en1wW99eaaw"300
TXT"google-site-verification=P9y8OEPZgrdMgDG7KT3WPjzugG08MblO_HWf47W1N3s"300
TXT"_8txsjrdoiiks1ds6gst3v46j7gmcega"300
TXT"atlassian-domain-verification=hAxF1aTK8DxtRvy7DRPyuWCgwPPnUDfSFYE71aCDXabn5NtnZgv9JQVinxbPTXXv"300
TXT"Validity-88Ij0jhgfcvbD88jakTjsli775$n"300
TXT"j9h15jjqvk6dqwsn9mgvrg8047r3v8vz"300
TXT"7k8gbnknl19gz9bltvcylnpnbybwncdb"300
TXT"TUo15TmVGzyrb0rI4lrnhPm3s2a7J8LmQz7V/JQZBZEEdZWF55Yg24ysQBcvD+i0wWBLm0kUtYagTSQzB0Scpg=="300
TXT"_cq5vgtgucw6bsbmr6amphk6wros7soz"300
TXT"pinterest-site-verification=2d95f1a8760ae5e400ee5685b97f9d26"300
TXT"google-site-verification=vZLm0izxlmTbS0HKbU4FKfLc06U-zEJGE9Bz-7yRqns"300
TXT"mandrill_verify.k62oqF1A1GoL0KldbMUoGg"300
TXT"twilio-domain-verification=675d8574db35534384f51a118d6293d0"300
TXT"v=msv1 t=9bc59147f3960f4fb00924bcd41c5f"300
TXT"v=msv1 t=1b6db388ee754e9ebbeaf7f3eb27a7"300
TXT"google-site-verification=Gj6RUbOSXDVnviWZGLwnH2wiLbPGMG4S7JwcjPqBKNE"300
TXT"google-site-verification=g2R7UxgESh0QqHU86WwbhzTOHVdIDx10mQVvprtQvzg"300
TXT"_652e8sq37593mp3ycga8rt2xgrd5lez"300
TXT"_globalsign-domain-verification=eRi2ZQZJ99fAou8jrSC06eUJpasrvj8YgWl21vaW5G"300
TXT"_orzjf8dsvcrey4fnwoy65en2wllfc0o"300

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (20s). Low TTLs are useful just before a planned change. The NS TTL at the parent is 2d and in the zone 15m; 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