cref.co - robtex.com
cref.co
| DNSSEC | ⚠️ Not signed | ||||||
| NS | cltb.tiaa-cref.org ⚠️ Not in zone NS records | ||||||
| A | 143.165.81.147🇺🇸 AS2923143.165.80.0/22 Prolexic Technologies, Inc. | ||||||
| PTR | cltb.tiaa-cref.org | ||||||
| PTR | cltb.tiaa.org | ||||||
| PTR | chapdbieblx01.lan.tiaa-cref.org | ||||||
| NS | nsb.tiaa-cref.org ⚠️ Not in zone NS records | ||||||
| A | 143.165.144.20🇺🇸 AS2923143.165.128.0/19 Prolexic Technologies, Inc. | ||||||
| PTR | nsb.tiaa-cref.org | ||||||
| PTR | nsb.tiaa.org | ||||||
| PTR | denpdaieblx01.lan.tiaa-cref.org | ||||||
| NS | nss.tiaa-cref.org ⚠️ Not in zone NS records | ||||||
| A | 143.165.48.30🇺🇸 AS2923143.165.32.0/19 PNAP-ACS | ||||||
| PTR | nss.tiaa-cref.org | ||||||
| PTR | nss.tiaa.org | ||||||
| PTR | chapdaieblx01.lan.tiaa-cref.org | ||||||
co
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | ns0.centralnic.net ⭐ | ||||||
| NS | a.registrydns.co | ||||||
| NS | b.registrydns.co | ||||||
| NS | c.registrydns.co | ||||||
| NS | d.registrydns.co | ||||||
| SOA | ns0.centralnic.nethostmaster@centralnic.net serial=1759655891 | ||||||
Same first word
cref.or.kr |
cref.org |
cref.jp |
cref.info |
cref.co |
cref.net |
cref.com.au |
cref.fr |
cref.cc |
cref.pt |
cref.be |
cref.co.jp |
cref.nl |
cref.co.kr |
cref.de |
cref.cf |
cref.co.uk |
cref.ru |
cref.com |
cref.it |
cref.org.tw |
cref.school |
Similar names
DNS History
3 records (3 active, 0 former)
●NScltb.tiaa-cref.org2026-05-09 → 2026-05-12 · 2 obs
● 2026-05-12 02:45:00
●NSnsb.tiaa-cref.org2026-05-09 → 2026-05-12 · 2 obs
● 2026-05-12 02:45:00
●NSnss.tiaa-cref.org2026-05-09 → 2026-05-12 · 2 obs
● 2026-05-12 02:45:00
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| co | a.registrydns.co, b.registrydns.co, c.registrydns.co, d.registrydns.co | - |
| cref.co | nsb.tiaa-cref.org, nss.tiaa-cref.org, cltb.tiaa-cref.org | - |
✅ Authoritative Response
Server:143.165.81.147
NS records: nsb.tiaa-cref.org, nss.tiaa-cref.org, cltb.tiaa-cref.org
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for cref.co (unsigned zone)
⏱️ Timing
Total: 3345ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|
Analysis
Name Servers
The domain cref.co is delegated to three name servers: cltb.tiaa-cref.org, nsb.tiaa-cref.org and nss.tiaa-cref.org.
cref.co shares name servers with other domains at least partially, for instance cefconnect.com, 165.143.in-addr.arpa, nuveenglobal.com, tiaaventures.com and nuveen.com.
these name servers are commonly paired with a1-88.akam.net, a10-67.akam.net, a12-64.akam.net, a28-65.akam.net, a5-66.akam.net, a9-67.akam.net, chapdaieblx01.lan.tiaa-cref.org, chapdbieblx01.lan.tiaa-cref.org and denpdaieblx01.lan.tiaa-cref.org.
Host names with a single IP number:
cltb.tiaa-cref.org points to 143.165.81.147.
nsb.tiaa-cref.org points to 143.165.144.20.
nss.tiaa-cref.org points to 143.165.48.30.