springernature.com

Checked 22 October 2026, 10:50 UTC · via 8.8.8.8
!Passed with warnings
25 passed 2 warnings 0 failed 4 info

Registration

info

.com generic · EuroDNS S.A. · expires 2027-03-09

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
EuroDNS S.A.
Registered
9 March 2015
Last changed
29 September 2026
Expires
9 March 2027
Status
client transfer prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers
pdns1.ultradns.net, pdns2.ultradns.net, pdns3.ultradns.org, pdns4.ultradns.org, pdns5.ultradns.info, pdns6.ultradns.co.uk
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 2027-03-09 #3
    The registration is valid until 2027-03-09 (138 days).
  • ✓ Transfer locked #4
    Registry status: client transfer 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

pdns1.ultradns.net, pdns2.ultradns.net, pdns3.ultradns.org, pdns4.ultradns.org, pdns5.ultradns.info, pdns6.ultradns.co.uk

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
pdns1.ultradns.net, pdns2.ultradns.net, pdns3.ultradns.org, pdns4.ultradns.org, pdns5.ultradns.info, pdns6.ultradns.co.uk
NS in the zone
pdns1.ultradns.net, pdns2.ultradns.net, pdns3.ultradns.org, pdns4.ultradns.org, pdns5.ultradns.info, pdns6.ultradns.co.uk
NameserverAddressesNetwork (AS)Glue
pdns1.ultradns.net204.74.108.1 2001:502:f3ff::1AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-
pdns2.ultradns.net204.74.109.1 2610:a1:1014::1AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-
pdns3.ultradns.org199.7.68.1 2610:a1:1015::1AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-
pdns4.ultradns.org199.7.69.1 2001:502:4612::1AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-
pdns5.ultradns.info204.74.114.1 2610:a1:1016::1AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-
pdns6.ultradns.co.uk204.74.115.1 2610:a1:1017::1AS12008 VERCARA - Vercara, LLC, US AS12008 VERCARA - Vercara, LLC, US-

Checks

  • ✓ 6 nameservers #6
    Delegated to pdns1.ultradns.net, pdns2.ultradns.net, pdns3.ultradns.org, pdns4.ultradns.org, pdns5.ultradns.info, pdns6.ultradns.co.uk.
  • ✓ 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 (AS12008 (VERCARA - Vercara, LLC, US): 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
  • ✓ Nameserver names under 4 TLDs #12
    Nameserver names use the TLDs .info, .net, .org, .uk.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

info

12 of 12 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
pdns1.ultradns.net 204.74.108.1NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns1.ultradns.net 2001:502:f3ff::1NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns2.ultradns.net 204.74.109.1NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns2.ultradns.net 2610:a1:1014::1NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns3.ultradns.org 199.7.68.1NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns3.ultradns.org 2610:a1:1015::1NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns4.ultradns.org 199.7.69.1NOERROR, 31 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns4.ultradns.org 2001:502:4612::1NOERROR, 31 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns5.ultradns.info 204.74.114.1NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns5.ultradns.info 2610:a1:1016::1NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns6.ultradns.co.uk 204.74.115.1NOERROR, 32 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns6.ultradns.co.uk 2610:a1:1017::1NOERROR, 31 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver

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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: pdns1.ultradns.net: "UltraDNS Nameserver"; pdns2.ultradns.net: "UltraDNS Nameserver"; pdns3.ultradns.org: "UltraDNS Nameserver"; pdns4.ultradns.org: "UltraDNS Nameserver"; pdns5.ultradns.info: "UltraDNS Nameserver"; pdns6.ultradns.co.uk: "UltraDNS Nameserver".
    #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 2017575256 · primary pdns1.ultradns.net

Found

Primary (MNAME)
pdns1.ultradns.net
Contact (RNAME)
hostmaster.springer.com
Serial
2017575256
Refresh / retry
14400 s / 900 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
pdns1.ultradns.net (204.74.108.1)2017575256
pdns1.ultradns.net (2001:502:f3ff::1)2017575256
pdns2.ultradns.net (204.74.109.1)2017575256
pdns2.ultradns.net (2610:a1:1014::1)2017575256
pdns3.ultradns.org (199.7.68.1)2017575256
pdns3.ultradns.org (2610:a1:1015::1)2017575256
pdns4.ultradns.org (199.7.69.1)2017575256
pdns4.ultradns.org (2001:502:4612::1)2017575256
pdns5.ultradns.info (204.74.114.1)2017575256
pdns5.ultradns.info (2610:a1:1016::1)2017575256
pdns6.ultradns.co.uk (204.74.115.1)2017575256
pdns6.ultradns.co.uk (2610:a1:1017::1)2017575256

Checks

  • ✓ Serial 2017575256 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 4h, retry 15m, expire 7d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver pdns1.ultradns.net is one of the listed nameservers.
  • ✓ Contact hostmaster@springer.com #25
    The SOA RNAME hostmaster.springer.com means hostmaster@springer.com.
  • ✓ Timestamp serial #26
    The serial 2017575256 is a Unix timestamp (2033-12-07 13:34 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

62 records at the apex

Found

Read from
204.74.108.1:53
TypeValueTTL
SOApdns1.ultradns.net. hostmaster.springer.com. 2017575256 14400 900 604800 360086400
NSpdns1.ultradns.net.86400
NSpdns2.ultradns.net.86400
NSpdns3.ultradns.org.86400
NSpdns4.ultradns.org.86400
NSpdns5.ultradns.info.86400
NSpdns6.ultradns.co.uk.86400
A146.75.116.9538
MX10 mxa-002c5801.gslb.pphosted.com.3600
MX10 mxb-002c5801.gslb.pphosted.com.3600
TXT"MS=ms25395878"86400
TXT"MS=ms88462947"86400
TXT"klaviyo-site-verification=WrkakY"86400
TXT"klaviyo-site-verification=XBSbcJ"86400
TXT"lovable_verification=RRjvRYYzlyNRyQgjsp9U"86400
TXT"airalo-domain-verification=8f0hRGb5Q8lupwY"86400
TXT"apple-domain-verification=kpgU8tG6KBbV75V1"86400
TXT"MS=E45A65BF7C0CC968275CDA2BDB1996E068E1442B"86400
TXT"brevo-code:cd8e7d5eab5faf6e2b1390dd51490388"86400
TXT"flexera-domain-verification-ailwilzuefexngok"86400
TXT"flexera-domain-verification-cgccpchnivowmtel"86400
TXT"SFMC-WwyACB-zFHR6n-nfoqPMVeIHVcC3UqLzfTf9532O"86400
TXT"docusign=05ddd754-07ab-4340-ab0f-0c5bef29568a"86400
TXT"docusign=d4dfae2f-f0a1-4ec8-b839-da542660231f"86400
TXT"canva-site-verification=0eQ4w0o1XIdbPUk-R__uFQ"86400
TXT"zscaler-verification-70601646-12132025-K3wNnYLpSy"86400
TXT"vertexinc-cloud-6a605069-e56b-4db2-a9e4-3660004af5f9"86400
TXT"1password-site-verification=LKQEOGHPPJFM7H7AIAZOEIRCCY"86400
TXT"amazonses:38OH4Wpj1clPWi6il6I4SQyb/ql/hutg3P+tl5HnjlU="86400
TXT"amazonses:OPt3XN+f4OY5F6wEd6DjLtya+o+6DUDZ/fSxXUDFHAI="86400
TXT"amazonses:yL69GEK6C/vRXXzQOYYSa6GI1K69wek0oTUG0cmCoko="86400
TXT"elevenlabs=MVtoQaLquE6kiU89-XyJDTKpx4OFISuC0RfDjHqpnoM"86400
TXT"openai-domain-verification=dv-BLVeicmlCQ9jWWtehS3FWSwn"86400
TXT"docker-verification=a380ba26-232d-41dc-8b1b-47945ea09749"86400
TXT"shopify-verification-code=hGTVJnD84cHOQcmmY9OJtmQVK0RZ48"86400
TXT"deepl-domain-verification=b8faec8a0acd4830a6c745d36a104c04"86400
TXT"mongodb-site-verification=0B0nIu8zY4VcLGtGXXnHt31SECNYHDiu"86400
TXT"mongodb-site-verification=fIVcbj8ncj620o6VDlMB39I1MsLDH8jI"86400
TXT"facebook-domain-verification=2o7rz24tshr5623rtfru30ptsae0nw"86400
TXT"citrix-verification-code=7f9be0a9-39b8-48d1-b72e-6890fe8f1f09"86400
TXT"onetrust-domain-verification=14531dc4832a4f058901f6248d4e18c5"86400
TXT"anthropic-domain-verification-q7r7pa=lqNNJEpGyNtGHVrWjGOHLmmM8"86400
TXT"logmein-verification-code=5f196181-f25c-4be7-886c-4b1dd698e9a5"86400
TXT"adobe-idp-site-verification=f30ae146-b47e-4873-90a4-71b6caa385fc"86400
TXT"extensis-domain-verification=247a2c5e-b2c3-477e-a1a1-69522ce10b98"86400
TXT"beautifulai-site-verification=2f0fcb97-318b-41ce-aaa0-858c7b62e77d"86400
TXT"google-site-verification=7OxwiDKxonxqIrZtruTXen71aSgoaSbrtmtjPNxMxS8"86400
TXT"google-site-verification=9VNVvMkBwEV4mfpD5R5zFuEPisxd7WXIi_8hUzuKvLA"86400
TXT"google-site-verification=EMgFxyWYIGAhddKBs4-3zsTfl4GsVQYcPXlUIIszB0k"86400
TXT"google-site-verification=J7baIdz8NXHcJS6iBl2oGIjHv7yDE8hDcY_6DEDD6oU"86400
TXT"google-site-verification=bCnNURj2iawSBN7fCpUrmBnLD7UtpAJyjehL_Bnjk1s"86400
TXT"google-site-verification=jjm4tSN06GAemUGzjy3t465Eq4-K9fAUXX5nB776-hY"86400
TXT"mistral-domain-verification=608944eb41acd27509f38a4e221611d074b45d42"86400
TXT"zapier-domain-verification-challenge=87fe051a-86a3-422d-838e-e2725d1235e5"86400
TXT"_globalsign-domain-verification=ZDZSSB-o6ZH6birEr4QdLtr7eDsv_xha9JJTieYSex"86400
TXT"0zx7e7eGUOLQxSFWZuQERfzg5VWls7t7z4V745/yJuvYfjWUWC+dGw64FRiJHVBJFXgUQLNUctbHHiFM9U1v9w=="86400
TXT"XYvr812KISVDVwiV3zcFuv4priUDxoeiNDFJp58pYLi54kXeTmwSGSDCaFFzubNyuUXEuEzH5Y/in53uuaU+GQ=="86400
TXT"cisco-ci-domain-verification=d2abc43e1b28f6d5fdea1ee3a3e0da848fb24e84001b27e5c0f363bbd08136b"86400
TXT"cisco-ci-domain-verification=324ec1fff7734184b378d1fd6814a8d9768d5ee5e2083de7bd52acabb8d5b46c"86400
TXT"atlassian-domain-verification=8YyRB1dGCFU6FTIcUt18raWzPoKaOFUG7xiFOkac8XcGVOZgEtzvjUqsWaClhXdJ"86400
TXT"figma-domain-verification=a02807ceec187285dae088008460ab5e258fd494d08ac0c2c56f3739ff32437f-1713256355"86400
TXT"v=spf1 ip4:185.132.180.79/32 ip4:185.183.28.43/32 ip4:192.87.127.46/32 ip4:192.87.127.243/32 ip4:192.87.127.244/32 ip4:63.116.214.22/32 ip4:63.116.214.22/32 ip4:195.128.10.15/32 ip4:195.128.10.18/32 ip4:195.128.10.69/32 ip4:199.168.14.54/32 ip4:208.185.22" "9.0/24 ip4:188.94.250.251/32 ip4:208.185.235.0/24 ip4:167.89.16.99/32 ip4:52.34.66.236/32 ip4:81.93.173.201 ip4:81.93.164.103 ip4:188.94.250.252 ip4:192.174.90.91/32 ip4:66.159.232.113/32 ip4:66.159.234.15/32 ip4:195.128.10.25/32 ip4:195.128.10.24/32 ip4:" "195.128.10.23/32 ip4:192.174.90.92/32 ip4:46.33.81.176/29 ip4:213.200.109.64/27 ip4:46.33.88.16/29 ip4:77.67.50.0/27 ip4:89.187.106.224/27 ip4:88.84.157.248/29 ip4:88.84.158.0/27 ip4:87.253.232.0/21 ip4:54.229.2.165 ip4:52.30.130.201 ip4:94.130.108.177/32" " ip4:185.189.236.0/22 ip4:185.211.120.0/22 ip4:185.250.236.0/22 include:_spf.salesforce.com include:trustpilotservice.com include:spf.mandrillapp.com include:_spf.google.com include:_spfi.evolver.de include:servers.mcsv.net -all"86400

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (38s). Low TTLs are useful just before a planned change. The NS TTL at the parent is 2d and in the zone 1d; 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