radissonblu.com

Checked 22 October 2026, 10:24 UTC · via 8.8.8.8
!Passed with warnings
23 passed 4 warnings 0 failed 4 info

Registration

info

.com generic · MarkMonitor Inc. · expires 2027-06-11

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
MarkMonitor Inc.
Registered
11 June 2008
Last changed
13 November 2025
Expires
11 June 2027
Status
client delete prohibited, client transfer prohibited, client update prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers
a1-234.akam.net, a28-65.akam.net, a3-66.akam.net, a4-67.akam.net, a7-64.akam.net, a8-65.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 2027-06-11 #3
    The registration is valid until 2027-06-11 (232 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client transfer prohibited, client update prohibited, server delete prohibited, server transfer prohibited, server update prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

a1-234.akam.net, a28-65.akam.net, a3-66.akam.net, a4-67.akam.net, a7-64.akam.net, a8-65.akam.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
a1-234.akam.net, a28-65.akam.net, a3-66.akam.net, a4-67.akam.net, a7-64.akam.net, a8-65.akam.net
NS in the zone
a1-234.akam.net, a28-65.akam.net, a3-66.akam.net, a4-67.akam.net, a7-64.akam.net, a8-65.akam.net
NameserverAddressesNetwork (AS)Glue
a1-234.akam.net193.108.91.234 2600:1401:2::eaAS20940 AKAMAI-ASN1 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a28-65.akam.net95.100.173.65 2600:1480:d800::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a3-66.akam.net96.7.49.66 2600:1408:1c::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a4-67.akam.net72.246.46.67 2600:1480:9000::43AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a7-64.akam.net23.61.199.64 2600:1406:32::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a8-65.akam.net2.16.40.65 2600:1403:a::41AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-

Checks

  • ✓ 6 nameservers #6
    Delegated to a1-234.akam.net, a28-65.akam.net, a3-66.akam.net, a4-67.akam.net, a7-64.akam.net, a8-65.akam.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 6 IPv4 /24s and 6 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS20940 (AKAMAI-ASN1 - Akamai International B.V., NL): 1 address; AS21342 (AKAMAI-ASN2 - Akamai International B.V., NL): 11 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
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

12 of 12 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
a1-234.akam.net 193.108.91.234NOERROR, 4 ms, authoritativenoyes / yesrefused41824.10
a1-234.akam.net 2600:1401:2::eaNOERROR, 4 ms, authoritativenoyes / yesrefused41824.10
a28-65.akam.net 95.100.173.65NOERROR, 4 ms, authoritativenoyes / yesrefused48878.27
a28-65.akam.net 2600:1480:d800::41NOERROR, 4 ms, authoritativenoyes / yesrefused48878.30
a3-66.akam.net 96.7.49.66NOERROR, 3 ms, authoritativenoyes / yesrefused41824.9
a3-66.akam.net 2600:1408:1c::42NOERROR, 4 ms, authoritativenoyes / yesrefused41824.6
a4-67.akam.net 72.246.46.67NOERROR, 4 ms, authoritativenoyes / yesrefused48878.30
a4-67.akam.net 2600:1480:9000::43NOERROR, 3 ms, authoritativenoyes / yesrefused48878.29
a7-64.akam.net 23.61.199.64NOERROR, 3 ms, authoritativenoyes / yesrefused41824.7
a7-64.akam.net 2600:1406:32::40NOERROR, 4 ms, authoritativenoyes / yesrefused41824.8
a8-65.akam.net 2.16.40.65NOERROR, 3 ms, authoritativenoyes / yesrefused48878.27
a8-65.akam.net 2600:1403:a::41NOERROR, 3 ms, authoritativenoyes / yesrefused48878.30

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: a1-234.akam.net: "41824.10"; a28-65.akam.net: "48878.27"; a28-65.akam.net: "48878.30"; a3-66.akam.net: "41824.9"; a3-66.akam.net: "41824.6"; a4-67.akam.net: "48878.30"; a4-67.akam.net: "48878.29"; a7-64.akam.net: "41824.7"; a7-64.akam.net: "41824.8"; a8-65.akam.net: "48878.27"; a8-65.akam.net: "48878.30". 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 2022070737 · primary a1-234.akam.net

Found

Primary (MNAME)
a1-234.akam.net
Contact (RNAME)
postmaster.radissonblu.com
Serial
2022070737
Refresh / retry
600 s / 3600 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
a1-234.akam.net (193.108.91.234)2022070737
a1-234.akam.net (2600:1401:2::ea)2022070737
a28-65.akam.net (95.100.173.65)2022070737
a28-65.akam.net (2600:1480:d800::41)2022070737
a3-66.akam.net (96.7.49.66)2022070737
a3-66.akam.net (2600:1408:1c::42)2022070737
a4-67.akam.net (72.246.46.67)2022070737
a4-67.akam.net (2600:1480:9000::43)2022070737
a7-64.akam.net (23.61.199.64)2022070737
a7-64.akam.net (2600:1406:32::40)2022070737
a8-65.akam.net (2.16.40.65)2022070737
a8-65.akam.net (2600:1403:a::41)2022070737

Checks

  • ✓ Serial 2022070737 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    refresh 10m is outside 20m–1d; retry 1h should be shorter than refresh 10m. Current values: refresh 10m, retry 1h, expire 7d, negative TTL 1h.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver a1-234.akam.net is one of the listed nameservers.
  • ✓ Contact postmaster@radissonblu.com #25
    The SOA RNAME postmaster.radissonblu.com means postmaster@radissonblu.com.
  • ✓ Date-based serial #26
    The serial 2022070737 follows the YYYYMMDDnn convention (2022-07-07).

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

18 records at the apex

Found

Read from
193.108.91.234:53
TypeValueTTL
SOAa1-234.akam.net. postmaster.radissonblu.com. 2022070737 600 3600 604800 3600600
NSa4-67.akam.net.600
NSa8-65.akam.net.600
NSa1-234.akam.net.600
NSa28-65.akam.net.600
NSa3-66.akam.net.600
NSa7-64.akam.net.600
A104.102.16.23920
MX0 radissonhotels.in.tmes.trendmicro.eu.600
TXT"p6Hagizz/jzPsfyT9a8NP08/6MLAhv3zoZOT8njUiuk="600
TXT"knowbe4-site-verification=a15db17b6e62b1ded7a9363b19d90606"600
TXT"amazonses:0VILBpCiSvHeloGNd2PgrDwyH/17xKedZw3YvnEDjN8="600
TXT"tmes=56c4d4fccc08e152639581db45dda4a1"600
TXT"MS=ms52401975"600
TXT"facebook-domain-verification=p55knpdcu3606kisp28o9yqx9nhmp9"600
TXT"adobe-idp-site-verification=9315089c4b3efc289f8a4784eda956fdff914eace9dcc8b19ae15233ea22dfb3"600
TXT"atlassian-domain-verification=KX2aLAPZ1iNXTguqChaB9yaOzVmpXWkkjqN68yZOjyaxXYfivmXNjBk53KpUpudc"600
TXT"v=spf1 mx:radissonblu.com include:spf.rezidor.com include:spf.protection.outlook.com include:sendgrid.net include:spf.tmes.trendmicro.com include:spf_3a.oracleindustry.com " " ip4:199.167.217.90 ip4:209.242.69.231 ip4:80.196.100.205/32 ip4:80.196.100.206/32 ip4:195.78.71.30/31 ip4:213.138.147.128/27 ip4:193.180.231.67/32 ip4:54.240.88.216/30 ip4:52.208.166.252/32 " " ip4:54.246.247.240/28 ip4:54.77.200.126/32 ip4:54.154.234.46/32 ip4:54.72.85.15/32 ip4:23.251.238.30/31 ip4:23.251.238.32/31 ip4:216.117.108.0/24 ip4:216.117.109.0/24 ip4:216.117.110.0/24 -all"600

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 10m; resolvers may use either.
    #32
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • i
    Wildcard record
    A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.
    #34
  • 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