sick.com

Checked 22 October 2026, 10:42 UTC · via 8.8.8.8
✗Problems found
24 passed 1 warning 2 failed 4 info

Registration

info

.com generic · Deutsche Telekom AG · expires 2027-01-08

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Deutsche Telekom AG
Registered
9 January 1996
Last changed
11 December 2025
Expires
8 January 2027
Status
client delete prohibited, client transfer prohibited
Registry nameservers
ns.sick.de, pns.dtag.de, secondary004.dtag.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 2027-01-08 #3
    The registration is valid until 2027-01-08 (77 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client transfer prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

ns.sick.de, pns.dtag.de, secondary004.dtag.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns.sick.de, pns.dtag.de, secondary004.dtag.net
NS in the zone
ns.sick.de, pns.dtag.de, secondary004.dtag.net
NameserverAddressesNetwork (AS)Glue
ns.sick.de91.207.92.80AS3320 DTAG - Deutsche Telekom AG, DE-
pns.dtag.de194.25.0.125 2003:40:8000::100AS3320 DTAG - Deutsche Telekom AG, DE AS3320 DTAG - Deutsche Telekom AG, DE-
secondary004.dtag.net195.244.245.27 2a00:fa8:3:0:100:0:4:1AS5605 NETUSE - NetUSE AG, DE AS5605 NETUSE - NetUSE AG, DE-

Checks

  • ✓ 3 nameservers #6
    Delegated to ns.sick.de, pns.dtag.de, secondary004.dtag.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 3 IPv4 /24s and 2 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS3320 (DTAG - Deutsche Telekom AG, DE): 3 addresses; AS5605 (NETUSE - NetUSE AG, DE): 2 addresses.
  • ✓ Nameserver names under 2 TLDs #12
    Nameserver names use the TLDs .de, .net.
  • i
    Partly IPv6
    These nameservers have no IPv6 address: ns.sick.de.
    #13

Nameservers

fail

1 of 5 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns.sick.de 91.207.92.80NOERROR, 10 ms, authoritativenono / yesrefused-
pns.dtag.de 194.25.0.125SERVFAIL, 10 ms, NOT authoritativenono / yesrefusedDomainNameServer
pns.dtag.de 2003:40:8000::100SERVFAIL, 7 ms, NOT authoritativenono / yesrefusedDomainNameServer
secondary004.dtag.net 195.244.245.27SERVFAIL, 13 ms, NOT authoritativenono / yesrefusedDomainNameServer
secondary004.dtag.net 2a00:fa8:3:0:100:0:4:1SERVFAIL, 17 ms, NOT authoritativenono / yesrefusedDomainNameServer

Checks

  • ✓ All respond #14
    All 5 nameserver addresses answered.
  • ✗
    Lame delegation
    These nameservers don't answer authoritatively for the zone, so resolvers ignore them: pns.dtag.de (194.25.0.125): SERVFAIL, authoritative=false; pns.dtag.de (2003:40:8000::100): SERVFAIL, authoritative=false; secondary004.dtag.net (195.244.245.27): SERVFAIL, authoritative=false; secondary004.dtag.net (2a00:fa8:3:0:100:0:4:1): SERVFAIL, authoritative=false.
    #15
  • ✓ No recursion #16
    The nameservers do not answer recursive queries for other domains.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: pns.dtag.de: "DomainNameServer"; secondary004.dtag.net: "DomainNameServer".
    #17
  • ✓ Zone transfers refused #18
    No nameserver allows a zone transfer to the public.
  • ✗
    No DNS over TCP
    DNS over TCP is required (RFC 7766); without it, large answers such as DNSSEC responses fail. Not answering over TCP: ns.sick.de (91.207.92.80): dial tcp 91.207.92.80:53: i/o timeout; pns.dtag.de (194.25.0.125): ; pns.dtag.de (2003:40:8000::100): ; secondary004.dtag.net (195.244.245.27): ; secondary004.dtag.net (2a00:fa8:3:0:100:0:4:1): .
    #19
  • ✓ EDNS supported #20
    All nameservers support EDNS(0).
  • ✓ Public addresses #21
    All nameserver addresses are publicly routable.

SOA

pass

serial 2026102205 · primary ns.sick.de

Found

Primary (MNAME)
ns.sick.de
Contact (RNAME)
hostmaster.sick.de
Serial
2026102205
Refresh / retry
28800 s / 7200 s
Expire
604800 s
Negative TTL
300 s

Checks

  • ✓ Serial 2026102205 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 8h, retry 2h, expire 7d, negative TTL 5m.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns.sick.de is one of the listed nameservers.
  • ✓ Contact hostmaster@sick.de #25
    The SOA RNAME hostmaster.sick.de means hostmaster@sick.de.
  • ✓ Date-based serial #26
    The serial 2026102205 follows the YYYYMMDDnn convention (2026-10-22).

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

18 records at the apex

Found

Read from
91.207.92.80:53
TypeValueTTL
SOAns.sick.de. hostmaster.sick.de. 2026102205 28800 7200 604800 300300
NSsecondary004.dtag.net.300
NSpns.dtag.de.300
NSns.sick.de.300
A80.72.131.6686400
MX10 mxb-001e4f01.gslb.pphosted.com.300
MX10 mxa-001e4f01.gslb.pphosted.com.300
TXT"google-site-verification: MC3uckrxXOWvJwmpsjwxloiZPWucB8ukLVS10BFaXQM"300
TXT"NK3Ilqqelq1V799hx54C"300
TXT"figma-domain-verification=5a6468cae4a5a279af5ae6916cfd2c38795a413bd940de0a34c39f9c1f29e93f-1762424564"300
TXT"eea6c1a9-84d4-46d2-99eb-6676226f88b4"300
TXT"mongodb-site-verification=NWEZOWcYam7dn3CzepxKEFTay8p8s0Cm"300
TXT"google-site-verification=9t_HxLLW5Qd8ykuXqr8SIb9E0-GeVuYqqlMtAh5Mo8s\010"300
TXT"successfactors-site-verification=YmY1ZmRlOGI1MTNlOTMzOTMwNGJjMTIxNGU4NjhhNjYwNjIyYmYzMzcwYjE3MzRiMDkwMDNhMzAxZWMxOTY2NA=="300
TXT"teamviewer-sso-verification=9d2ecc9d3ad343019b332cbee53cb24a"300
TXT"ciscocidomainverification:6f51d0d88b5efdfcf1556f91927897e3dc134ce7839a0e95cabe4186b426f12b"300
TXT"atlassian-domain-verification=KPSgBm9MDzAXgORAKwT2io5q2cgvf8amoBHa4BLaPf7Fcp1BB2zOqIJz/hBX0EWl"3600
TXT"v=spf1 include:spf.sick.com -all"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 1d, MX 5m, NS 5m. The NS TTL at the parent is 2d and in the zone 5m; 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.
  • 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