springer.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 2027-05-28

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
EuroDNS S.A.
Registered
29 May 1997
Last changed
29 September 2026
Expires
28 May 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 2027-05-28 #3
    The registration is valid until 2027-05-28 (217 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, 4 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns2.ultradns.net 204.74.109.1NOERROR, 4 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns2.ultradns.net 2610:a1:1014::1NOERROR, 4 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, 32 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns5.ultradns.info 204.74.114.1NOERROR, 3 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns5.ultradns.info 2610:a1:1016::1NOERROR, 4 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns6.ultradns.co.uk 204.74.115.1NOERROR, 31 ms, authoritativenoyes / yesrefusedUltraDNS Nameserver
pdns6.ultradns.co.uk 2610:a1:1017::1NOERROR, 32 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 2016074732 · primary pdns1.ultradns.net

Found

Primary (MNAME)
pdns1.ultradns.net
Contact (RNAME)
hostmaster.springer.com
Serial
2016074732
Refresh / retry
7200 s / 900 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
pdns1.ultradns.net (204.74.108.1)2016074732
pdns1.ultradns.net (2001:502:f3ff::1)2016074732
pdns2.ultradns.net (204.74.109.1)2016074732
pdns2.ultradns.net (2610:a1:1014::1)2016074732
pdns3.ultradns.org (199.7.68.1)2016074732
pdns3.ultradns.org (2610:a1:1015::1)2016074732
pdns4.ultradns.org (199.7.69.1)2016074732
pdns4.ultradns.org (2001:502:4612::1)2016074732
pdns5.ultradns.info (204.74.114.1)2016074732
pdns5.ultradns.info (2610:a1:1016::1)2016074732
pdns6.ultradns.co.uk (204.74.115.1)2016074732
pdns6.ultradns.co.uk (2610:a1:1017::1)2016074732

Checks

  • ✓ Serial 2016074732 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 2h, 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 2016074732 is a Unix timestamp (2033-11-20 04:45 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

50 records at the apex

Found

Read from
204.74.108.1:53
TypeValueTTL
SOApdns1.ultradns.net. hostmaster.springer.com. 2016074732 7200 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
A146.75.116.9555
MX10 mxa-002c5801.gslb.pphosted.com.3600
MX10 mxb-002c5801.gslb.pphosted.com.3600
TXT"MS=ms78204475"86400
TXT"lovable_verification=RRjvRYYzlyNRyQgjsp9U"86400
TXT"MS=1C4E80428ECF2197D70E028BF1D5940C53272135"86400
TXT"flexera-domain-verification-aeitimdgqbglxtev"86400
TXT"flexera-domain-verification-chqlciydogcnptaz"86400
TXT"SFMC-MVH07EMhNoUkJaUN2Ljqh8SxWf6yUzBRUHFHPyDS"86400
TXT"docusign=b91742f4-1de7-49c0-8419-c6e7b8df9153"86400
TXT"canva-site-verification=QMeoXyxix_xid1U4yQwMXA"86400
TXT"vertexinc-cloud-51d44382-7960-48f7-b51e-5212f4361c7a"86400
TXT"1password-site-verification=UPKRUMKB3RCTJJ7TCUE25ED6LY"86400
TXT"amazonses:xyoOimFZCMBBHM34oAU0LNs4+K/K4aSLw4fyiE5rlHw="86400
TXT"elevenlabs=htgkNynt98_WQQxEQOYcFi7dECs35fWsKzt6kJu2Ljk"86400
TXT"openai-domain-verification=dv-zwKNWCwczk2MoUWFGoVrnsCz"86400
TXT"docker-verification=b297e373-6dd2-44f4-9a43-6b7b7bbbd0b0"86400
TXT"shopify-verification-code=HGUH91nAr57g1menBHV0W5nVPcxtpf"86400
TXT"deepl-domain-verification=b8faec8a0acd4830a6c745d36a104c04"86400
TXT"facebook-domain-verification=1kaxt38kjanljujwoetwnrpbzs1s3r"86400
TXT"onetrust-domain-verification=340cbe9c178446e792ce7ec4909e6415"86400
TXT"anthropic-domain-verification-bqptrp=v9wpfv9cCmays3ssTEFHg501k"86400
TXT"extensis-domain-verification=247a2c5e-b2c3-477e-a1a1-69522ce10b98"86400
TXT"google-site-verification=2fe0xW_3vftnKKv-JdWQBFoYRev6M4qWsB9-1U9ynFA"86400
TXT"google-site-verification=BMRCdiXlqiW_LDDkgi8F1MQJ35elf5mB-bzfB_kz5L4"86400
TXT"google-site-verification=XTgDyZkDJhd30u2nxwiNMZ8JQloZa_1moAbqoDOt6Q0"86400
TXT"google-site-verification=bnqyk4LPYnvBpjCtyaarHsn1M7JbTrHGogLFoBGr8e4"86400
TXT"google-site-verification=jUq69goCFXn9Z9QCW5_O1iALBt9LZZ77icdW9TaRtkQ"86400
TXT"google-site-verification=pO7cXCufNSjTBzsdQZDs62zcGtzzTl2GTRnXzwfMDI0"86400
TXT"google-site-verification=r-mNXFlbTzOLf3U-9CwvQ9y5x-VteDkSgSBxFITB9_w"86400
TXT"mistral-domain-verification=196c74f6fdab912a2a5c714149fe9675f92da7d9"86400
TXT"globalsign-domain-verification=DxtJ51OaIp87_OgmKu-iPxmFMN4i0CvhJtymIzHDyK"86400
TXT"zapier-domain-verification-challenge=014e2b0e-979f-447c-9997-bb7b899be9cc"86400
TXT"_globalsign-domain-verification=95YZs-Lq6mpDrrS5bnsvxSp8Llz8ZsgkwBGGx8RQVh"86400
TXT"_globalsign-domain-verification=GXpUUS49HB9rYWZEmxJFtZdS61weLMlf91w9Dn-5O0"86400
TXT"_globalsign-domain-verification=aQIRcZ4Sa1SmXZlbSPt5QrVI6ozleqa0sPLU-bElLs"86400
TXT"adobe-idp-site-verification=e7d316e26179ad0d4b3f90cf2a0754eec7efe5ffd4e42fd68fb1bf562238e1e5"86400
TXT"v=DMARC1; p=none; pct=100; rua=mailto:re+undujzcqrz6@dmarc.postmarkapp.com; sp=none; aspf=r;"86400
TXT"cisco-ci-domain-verification=21a19db53c9e0a7ac86466cf36934d275534813c9d6b503210e77f8a0f2583c5"86400
TXT"cisco-ci-domain-verification=46aaf2d1013e9a15aae51f1209572e18098496310bde5b4f164f2b1a5f73d5d9"86400
TXT"atlassian-domain-verification=8YyRB1dGCFU6FTIcUt18raWzPoKaOFUG7xiFOkac8XcGVOZgEtzvjUqsWaClhXdJ"86400
TXT"figma-domain-verification=a02807ceec187285dae088008460ab5e258fd494d08ac0c2c56f3739ff32437f-1713256355"86400
TXT"v=spf1 ip4:192.87.127.46/32 ip4:192.87.127.47/32 ip4:188.94.250.251/32 ip4:192.87.127.243/32 ip4:192.87.127.244/32 ip4:63.116.214.21/32 ip4:63.116.214.22/32 ip4:195.140.184.0/22 ip4:91.192.40.0/22 ip4:62.50.45.39/32 ip4:199.168.14.54/32 ip4:195.128.10.15/" "32 ip4:195.128.10.18/32 ip4:185.68.136.12/32 ip4:167.89.0.0/17 ip4:195.128.10.23/32 ip4:66.159.232.113/32 ip4:66.159.234.15/32 ip4:195.128.10.24/32 ip4:195.128.10.25/32 ip4:208.117.48.0/20 ip4:50.31.32.0/19 ip4:198.37.144.0/20 ip4:52.43.154.216 ip4:192.17" "4.90.93 ip4:52.41.1.125 ip4:192.174.90.94 ip4:52.34.66.236/32 ip4:94.130.108.177 ip4:192.174.90.92/32 ip4:87.253.232.0/21 ip4:185.189.236.0/22 ip4:185.211.120.0/22 ip4:185.250.236.0/22 include:trustpilotservice.com include:_spf.google.com include:spf-002c" "5801.pphosted.com include:ispgateway.de include:_spf.salesforce.com -all"86400

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: A (55s). 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