zeiss.com

Checked 22 October 2026, 11:42 UTC · via 8.8.8.8
!Passed with warnings
24 passed 3 warnings 0 failed 4 info

Registration

info

.com generic · Key-Systems GmbH · expires 2027-03-22

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Key-Systems GmbH
Registered
21 March 1995
Last changed
23 March 2026
Expires
22 March 2027
Status
client transfer prohibited
Registry nameservers
a1-232.akam.net, a13-66.akam.net, a18-66.akam.net, a26-67.akam.net, a7-64.akam.net, a8-64.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 2027-03-22 #3
    The registration is valid until 2027-03-22 (150 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

a1-232.akam.net, a13-66.akam.net, a18-66.akam.net, a26-67.akam.net, a7-64.akam.net, a8-64.akam.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
a1-232.akam.net, a13-66.akam.net, a18-66.akam.net, a26-67.akam.net, a7-64.akam.net, a8-64.akam.net
NS in the zone
a1-232.akam.net, a13-66.akam.net, a18-66.akam.net, a26-67.akam.net, a7-64.akam.net, a8-64.akam.net
NameserverAddressesNetwork (AS)Glue
a1-232.akam.net193.108.91.232 2600:1401:2::e8AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a13-66.akam.net2.22.230.66 2600:1480:800::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a18-66.akam.net95.101.36.66 2600:1480:4800::42AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-
a26-67.akam.net23.74.25.67 2600:1480:b800::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-
a8-64.akam.net2.16.40.64 2600:1403:a::40AS21342 AKAMAI-ASN2 - Akamai International B.V., NL AS21342 AKAMAI-ASN2 - Akamai International B.V., NL-

Checks

  • ✓ 6 nameservers #6
    Delegated to a1-232.akam.net, a13-66.akam.net, a18-66.akam.net, a26-67.akam.net, a7-64.akam.net, a8-64.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.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS21342 (AKAMAI-ASN2 - Akamai International B.V., NL): 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 .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
a1-232.akam.net 193.108.91.232NOERROR, 5 ms, authoritativenoyes / yesrefused41824.9
a1-232.akam.net 2600:1401:2::e8NOERROR, 5 ms, authoritativenoyes / yesrefused41824.9
a13-66.akam.net 2.22.230.66NOERROR, 5 ms, authoritativenoyes / yesrefused41824.11
a13-66.akam.net 2600:1480:800::42NOERROR, 5 ms, authoritativenoyes / yesrefused41824.8
a18-66.akam.net 95.101.36.66NOERROR, 5 ms, authoritativenoyes / yesrefused48878.30
a18-66.akam.net 2600:1480:4800::42NOERROR, 3 ms, authoritativenoyes / yesrefused48878.30
a26-67.akam.net 23.74.25.67NOERROR, 3 ms, authoritativenoyes / yesrefused48878.30
a26-67.akam.net 2600:1480:b800::43NOERROR, 8 ms, authoritativenoyes / yesrefused48878.32
a7-64.akam.net 23.61.199.64NOERROR, 6 ms, authoritativenoyes / yesrefused41824.4
a7-64.akam.net 2600:1406:32::40NOERROR, 5 ms, authoritativenoyes / yesrefused41824.4
a8-64.akam.net 2.16.40.64NOERROR, 5 ms, authoritativenoyes / yesrefused48878.32
a8-64.akam.net 2600:1403:a::40NOERROR, 5 ms, authoritativenoyes / yesrefused48878.29

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: a1-232.akam.net: "41824.9"; a13-66.akam.net: "41824.11"; a13-66.akam.net: "41824.8"; a18-66.akam.net: "48878.30"; a26-67.akam.net: "48878.30"; a26-67.akam.net: "48878.32"; a7-64.akam.net: "41824.4"; a8-64.akam.net: "48878.32"; a8-64.akam.net: "48878.29". 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 2018071009 · primary a1-232.akam.net

Found

Primary (MNAME)
a1-232.akam.net
Contact (RNAME)
hostmaster.zeiss.com
Serial
2018071009
Refresh / retry
10800 s / 3600 s
Expire
1209600 s
Negative TTL
900 s

Serial per nameserver

NameserverSerial
a1-232.akam.net (193.108.91.232)2018071009
a1-232.akam.net (2600:1401:2::e8)2018071009
a13-66.akam.net (2.22.230.66)2018071009
a13-66.akam.net (2600:1480:800::42)2018071009
a18-66.akam.net (95.101.36.66)2018071009
a18-66.akam.net (2600:1480:4800::42)2018071009
a26-67.akam.net (23.74.25.67)2018071009
a26-67.akam.net (2600:1480:b800::43)2018071009
a7-64.akam.net (23.61.199.64)2018071009
a7-64.akam.net (2600:1406:32::40)2018071009
a8-64.akam.net (2.16.40.64)2018071009
a8-64.akam.net (2600:1403:a::40)2018071009

Checks

  • ✓ Serial 2018071009 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 14d, negative TTL 15m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver a1-232.akam.net is one of the listed nameservers.
  • ✓ Contact hostmaster@zeiss.com #25
    The SOA RNAME hostmaster.zeiss.com means hostmaster@zeiss.com.
  • ✓ Date-based serial #26
    The serial 2018071009 follows the YYYYMMDDnn convention (2018-07-10).

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

48 records at the apex

Found

Read from
193.108.91.232:53
TypeValueTTL
SOAa1-232.akam.net. hostmaster.zeiss.com. 2018071009 10800 3600 1209600 9003600
NSa7-64.akam.net.3600
NSa8-64.akam.net.3600
NSa13-66.akam.net.3600
NSa26-67.akam.net.3600
NSa1-232.akam.net.3600
NSa18-66.akam.net.3600
A2.16.206.1820
A2.16.206.420
AAAA2a02:26f0:b700:8::210:ce4820
AAAA2a02:26f0:b700:8::210:ce4520
MX10 mx-in01.eu.retarus.com.3600
MX10 mx-in02.eu.retarus.com.3600
TXT"SFMC-F9m0LQrL4GQGumdvUV8Yzt_B50Q_X96XO_9iyoTi"600
TXT"postman-domain-verification=3c7fae2e8dec2baa1e3774d83fea3e80313e73306e7eafaac57f6585dc3ff821"600
TXT"onetrust-domain-verification=be0a015b20944ecca31e58bda3429fed"600
TXT"DomainVerification=ATWT4TGMFZCKF8KXM11RIXU78AFZDLJQSEDCCEOZJIMABI9IFFLEZDO1TR1O0O22"600
TXT"dtm-domain-verification=Lczbe_LJUDkiooY-2MgIZn_OZGf-DZO3sXpd_sdUcTE"600
TXT"twilio-domain-verification=fc97311768eeb285e621b9b8e4d44830"600
TXT"teamviewer-sso-verification=80a34727a7fb4fb8a6b20269aa85062e"600
TXT"00DR1000002jyEz=1TBR100000005HR"600
TXT"smartsheet-site-validation=ytndkkHoWZK75GZTNbFIen5TM-lSe5Gw"600
TXT"cisco-ci-domain-verification=49c1fdf020e36defb8cf6de84b0b3b64d6768eb8a7e3b34e35618571c8a4fcd1"600
TXT"google-gws-recovery-domain-verification=62755282"600
TXT"deepl-domain-verification=91300aae0d164673a5b95d470ff74559"600
TXT"asv_domain=97aa44d1fed4f58bb84f1dc5d46330f8"600
TXT"00D9M00000LUUz5=1TB9M00000005Cd"600
TXT"mixpanel-domain-verify=14b1aa96-0389-4438-8a85-976ca7064e33"600
TXT"elevenlabs=2wjXvi1ERK-lijVZttBsYJRECwf-N9q3zna09kFCYQQ"600
TXT"MS=C0554746F0803649B432A668BC9F87337D7E1941"600
TXT"google-site-verification=MpUOpXbEsdsootlUKIs-IwYIGGBKcYXDlBHlO79kaGQ"600
TXT"v=spf1 include:mktomail.com include:_spf.salesforce.com include:spf.protection.outlook.com" " include:spf-mx5.zeiss.com include:_spf.general.transactional-mail-a.com include:spf.mailjet.com include:spf.joinmyit.com include:spf-mx.zeiss.com include:amazonses.com -all"600
TXT"00D7Q00000B63it=1TBbi00000003lt"600
TXT"Dynatrace-site-verification=ee7ce1ee-946f-4b14-ada4-7241d56d07f7__6uvebh8dkv8c2ga9cagh16uq3s"600
TXT"00Db0000000JJTI=1TBSZ0000000Efh"600
TXT"00Dbh0000025n3r=1TBbh00000007ZO"600
TXT"mindmanager-verification=9d970a1ce7cc06cd49ffc3aeba81b0411de1cc7b687cf2f6ab2381021dc4e51b"600
TXT"miro-verification=ad6b0ed2d04e6bbef4a51d55b9f82631b3cdadeb"600
TXT"h1-domain-verification=xwkXjYQNJY8rJGGZBwJKVHZR7Erykm8gnpwLpeekEE7v4qU5"600
TXT"9bNcXJ0tP4AOu4GZVovaQ5V6HCLeMejliFV9XD5oRKAYTNWXwMn12+vm41Tc+DES1607whRb/5EI8B7LQfDuhQ=="600
TXT"atlassian-domain-verification=Rupi8QU123hDQih5cjQbtEDalANhxzEbICnLsegL2460NYNtsT3s6UctNWjkglGm"600
TXT"adobe-idp-site-verification=f6d4a449-9959-49fb-9b4e-fa3c778bfc49"600
TXT"atlassian-domain-verification=AowSS5TYghUAXfiF12PTYy3K4NpavaxLKfbTURFqnGv8YTTh87gBW5tOs5pKhZ9J"600
TXT"d365mktkey=VqxakgCocPUopdkhDkxgZxe5ezOSjf8Hl9LGseiqWOsx"600
TXT"Foxit-domain-verification=257fe05909655172642e77afbaf218c2"600
TXT"onetrust-domain-verification=ae30cefcb09347f9b4efc63115beff9f"600
TXT"autodesk-domain-verification=dm-leJ8kMUsqbaeAFZnB"600
TXT"v=DKIM1;k=rsa;p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC87eAnOC4L4gamKwX5GGumeFBTKNu83KXWMEUwplluQB6rTNdyBiMoDedgjdNfKugpAX81N/m9LYdRjEOEpwd5aSwRJZvPIciKCDfxrtuOCoy1MAmfr83TRvZgJPubRqBP7SqP0InbXdb4ZJtzDDro+MaK7Ll3IAMGazGNHzB9kwIDAQAB"600

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (20s), AAAA (20s). 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