jacobs.com

Checked 22 October 2026, 09:23 UTC · via 8.8.8.8
!Passed with warnings
24 passed 4 warnings 0 failed 3 info

Registration

info

.com generic · CSC Corporate Domains, Inc. · expires 2027-05-08

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
CSC Corporate Domains, Inc.
Registered
7 May 1994
Last changed
4 May 2026
Expires
8 May 2027
Status
client transfer prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers
ns1-08.azure-dns.com, ns2-08.azure-dns.net, ns3-08.azure-dns.org, ns4-08.azure-dns.info
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 2027-05-08 #3
    The registration is valid until 2027-05-08 (197 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

ns1-08.azure-dns.com, ns2-08.azure-dns.net, ns3-08.azure-dns.org, ns4-08.azure-dns.info

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns1-08.azure-dns.com, ns2-08.azure-dns.net, ns3-08.azure-dns.org, ns4-08.azure-dns.info
NS in the zone
ns1-08.azure-dns.com, ns2-08.azure-dns.net, ns3-08.azure-dns.org, ns4-08.azure-dns.info
NameserverAddressesNetwork (AS)Glue
ns1-08.azure-dns.com13.107.236.8 2603:1061:0:700::8AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US13.107.236.8 2603:1061:0:700::8
ns2-08.azure-dns.net150.171.21.8 2620:1ec:8ec:700::8AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US-
ns3-08.azure-dns.org204.14.183.8 2a01:111:4000:700::8AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US-
ns4-08.azure-dns.info208.84.5.8 2620:1ec:bda:700::8AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US AS8075 MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns1-08.azure-dns.com, ns2-08.azure-dns.net, ns3-08.azure-dns.org, ns4-08.azure-dns.info.
  • ✓ 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 4 IPv4 /24s and 4 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS8075 (MICROSOFT-CORP-MSN-AS-BLOCK - Microsoft Corporation, US): 8 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 .com, .info, .net, .org.
  • ✓ All reachable over IPv6 #13
    Every nameserver has an IPv6 address.

Nameservers

warn

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1-08.azure-dns.com 13.107.236.8NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns1-08.azure-dns.com 2603:1061:0:700::8NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns2-08.azure-dns.net 150.171.21.8NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns2-08.azure-dns.net 2620:1ec:8ec:700::8NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns3-08.azure-dns.org 204.14.183.8NOERROR, 4 ms, authoritativenoyes / yesrefused-
ns3-08.azure-dns.org 2a01:111:4000:700::8NOERROR, 5 ms, authoritativenoyes / yesrefused-
ns4-08.azure-dns.info 208.84.5.8NOERROR, 4 ms, authoritativenoyes / yesrefusedKnot DNS 3.1.2.1770717641.d6b376aff
ns4-08.azure-dns.info 2620:1ec:bda:700::8NOERROR, 4 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 8 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: ns4-08.azure-dns.info: "Knot DNS 3.1.2.1770717641.d6b376aff". 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 930173595 · primary ns1-08.azure-dns.com

Found

Primary (MNAME)
ns1-08.azure-dns.com
Contact (RNAME)
dnslevel3.jacobs.com
Serial
930173595
Refresh / retry
900 s / 600 s
Expire
86400 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns1-08.azure-dns.com (13.107.236.8)930173595
ns1-08.azure-dns.com (2603:1061:0:700::8)930173595
ns2-08.azure-dns.net (150.171.21.8)930173595
ns2-08.azure-dns.net (2620:1ec:8ec:700::8)930173595
ns3-08.azure-dns.org (204.14.183.8)930173595
ns3-08.azure-dns.org (2a01:111:4000:700::8)930173595
ns4-08.azure-dns.info (208.84.5.8)930173595
ns4-08.azure-dns.info (2620:1ec:bda:700::8)930173595

Checks

  • ✓ Serial 930173595 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    refresh 15m is outside 20m–1d; expire 1d is shorter than 7d; secondaries stop answering too soon when the primary is down. Current values: refresh 15m, retry 10m, expire 1d, negative TTL 1h.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1-08.azure-dns.com is one of the listed nameservers.
  • ✓ Contact dnslevel3@jacobs.com #25
    The SOA RNAME dnslevel3.jacobs.com means dnslevel3@jacobs.com.
  • ✓ Counter serial #26
    The serial 930173595 is a plain counter.

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

36 records at the apex

Found

Read from
13.107.236.8:53
TypeValueTTL
SOAns1-08.azure-dns.com. dnslevel3.jacobs.com. 930173595 900 600 86400 36003600
NSns1-08.azure-dns.com.3600
NSns2-08.azure-dns.net.3600
NSns3-08.azure-dns.org.3600
NSns4-08.azure-dns.info.3600
A3.230.178.393600
MX10 mxb-0025cf01.gslb.pphosted.com.60
MX10 mxa-0025cf01.gslb.pphosted.com.60
MX100 smtp-pp.jacobs.com.60
TXT"gBBcr+miJUCECfWGQW8gnsrkV7SItK5Cpzy8zO36rihMs+AHz6pvgIOWlEcERtrK4kOFSQ1Tr65ZTuMBfL99Yw=="300
TXT"adobe-sign-verification=66a567c26b2d4c30f092ac3c6e6c7bc7"300
TXT"t67r4s4vp6btmx2d3bcnj1lzx5q0bnfp"300
TXT"waukesha.azurewebsites.net"300
TXT"8vf0p03xyys3ts31k1mvb6qdjtgv0kcn"300
TXT"C05F2DDEF47F43CDA402F5DA4D042560B304C41B666A746DF3A265400E486D55"300
TXT"docusign=60240bd9-d7a9-421e-abea-7d9a80d4f305"300
TXT"apple-domain-verification=cVbKQDxW79lf7fQg"300
TXT"atlassian-domain-verification=EJpsGNqX5DXedmfQY7Kys4oFHvdhCuTHflBuqDrcoc3Ut6jrFF7bK8EbImi1irbz"300
TXT"v=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com -all"300
TXT"e2ma-verification=g3reb"300
TXT"adobe-idp-site-verification=7f1bdb4d0a06e04078341f47244eee943c59b56b5a3e39aca48b02b2cd2cd5e0"300
TXT"sending_domain934003=02d831ab6d225a3f496583530f8602da0c04a94d9f96d5502d34a8e9b1a8c1d6"300
TXT"parkable-domain-verification=spAiXmXNI2xMeSyKm1YCcchFIY-VQ8PCrvhB78ivP-w="300
TXT"duo_sso_verification=h3yqDFm1JuWpL4OM6VlC0nmum4AE3SCwnvsduPgmRuuYPXA6SlfrzBqV2VSdGArx"300
TXT"pardot1070232=d1128eb387916f9c11531cd2cd9b59fe4a8d61e48f6c79afb94ccee8fb0b552a"300
TXT"cisco-ci-domain-verification=26d93c388df65d983c7782d8705211aee43729a5fa092b032a5b0642757bc596"300
TXT"google-site-verification=zIR8c42jGoAIlnY9gUQ6v6UGWOpzkxA5XIPFVnWvlsM"300
TXT"smartsheet-site-validation=gG_HrIm5PNxZE3KJbTNTF8_Fgm-DRD6_"300
TXT"atlassian-domain-verification=Da9nYIWWvPb1t5BmeHczgum7s3PyD4r9nwczZmDWHBxqyjw68WUVyWF3DVHsZgtJ"300
TXT"docusign=4ae18026-107f-489e-9da3-255ff57a1b05"300
TXT"docusign=6f1305c5-e5fc-42fc-8afb-79909896f5ed"300
TXT"bw=ZL1CZXdFqe46LeyMVa5a5DQgzYt6XuX5U4wVnM02cLZV"300
TXT"00D61000000ZsMX=1TBUN00000005jA"300
TXT"_hqllqeo8ke7ei1opgu8z9vplv9z540n"300
TXT"amFjb2Jz"300
TXT"hpe-greenlake-domain-verification=61536d6764465872704c75424162556b476e5a354762736c596d76545743334c"300

Checks

  • !
    Very low TTLs
    These records have a TTL below 5m, causing extra queries and slower lookups: MX (1m). 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