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WHOIS

Lookup an IP or domain. Uses IANA referral first, then registry WHOIS.

Query
203.131.211.181
IANA
whois.iana.org
Referred
whois.apnic.net
WHOIS servers can rate limit. Results are cached for performance.
### IANA response (whois.iana.org)

% IANA WHOIS server
% for more information on IANA, visit http://www.iana.org
% This query returned 1 object

refer:        whois.apnic.net

inetnum:      203.0.0.0 - 203.255.255.255
organisation: APNIC
status:       ALLOCATED

remarks:      203.0.113.0/24 reserved for TEST-NET-3 [RFC5737].
remarks:      Complete registration details for 203.0.113.0/24 are
remarks:      found iniana-ipv4-special-registry.

whois:        whois.apnic.net

changed:      1993-05
source:       IANA

### Registry response (whois.apnic.net)

% [whois.apnic.net]
% Whois data copyright terms    http://www.apnic.net/db/dbcopyright.html

% Information related to '203.131.208.0 - 203.131.223.255'

% Abuse contact for '203.131.208.0 - 203.131.223.255' is 'mit@tu.ac.th'

inetnum:        203.131.208.0 - 203.131.223.255
netname:        THAMMASAT
descr:          Thammasat University
descr:          2 Phrachan Road, Phranakorn, Bangkok 10200, Thailand
country:        TH
org:            ORG-TU2-AP
admin-c:        SK1310-AP
tech-c:         SK1310-AP
abuse-c:        AT1190-AP
status:         ALLOCATED PORTABLE
remarks:        -+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+-+-+-+-+-+-+-+-+-+
remarks:        This object can only be updated by APNIC hostmasters.
remarks:        To update this object, please contact APNIC
remarks:        hostmasters and include your organisation's account
remarks:        name in the subject line.
remarks:        -+-+-+-+-+-+-+-+-+-+-+-++-+-+-+-+-+-+-+-+-+-+-+-+-+-+
mnt-by:         APNIC-HM
mnt-lower:      MAINT-TH-TU
mnt-routes:     MAINT-TH-TU
mnt-irt:        IRT-THAMMASAT-TH
last-modified:  2020-10-20T00:57:37Z
source:         APNIC

irt:            IRT-THAMMASAT-TH
address:        2 Phrachan Road, Phranakorn, Bangkok 10200, Thailand
e-mail:         mit@tu.ac.th
abuse-mailbox:  mit@tu.ac.th
admin-c:        NS809-AP
tech-c:         NS809-AP
auth:           # Filtered
remarks:        mit@tu.ac.th was validated on 2026-02-17
mnt-by:         MAINT-TH-TU
last-modified:  2026-02-17T13:22:45Z
source:         APNIC

organisation:   ORG-TU2-AP
org-name:       Thammasat University
org-type:       LIR
country:        TH
address:        2 Phrachan Road, Phranakorn
phone:          +66-2613-3456
fax-no:         +66-2953-0541
e-mail:         mit@tu.ac.th
mnt-ref:        APNIC-HM
mnt-by:         APNIC-HM
last-modified:  2024-07-15T13:00:17Z
source:         APNIC

role:           ABUSE THAMMASATTH
country:        ZZ
address:        2 Phrachan Road, Phranakorn, Bangkok 10200, Thailand
phone:          +000000000
e-mail:         mit@tu.ac.th
admin-c:        NS809-AP
tech-c:         NS809-AP
nic-hdl:        AT1190-AP
remarks:        Generated from irt object IRT-THAMMASAT-TH
remarks:        mit@tu.ac.th was validated on 2026-02-17
abuse-mailbox:  mit@tu.ac.th
mnt-by:         APNIC-ABUSE
last-modified:  2026-02-17T13:23:08Z
source:         APNIC

person:         Sathaporn Koraksawet
nic-hdl:        SK1310-AP
e-mail:         stp@tu.ac.th
address:        2 Phrachan Road, Phranakorn, Bangkok 10200, Thailand
phone:          +662-613-3456
fax-no:         +662-953-0541
country:        TH
mnt-by:         MAINT-TH-TU
last-modified:  2016-12-28T07:12:35Z
source:         APNIC

% This query was served by the APNIC Whois Service version 1.88.34 (WHOIS-UK2)

Frequently Asked Questions

What is WHOIS?

WHOIS is a protocol that queries databases to find the registered owner of a domain name or IP address. It reveals the registrar, registration dates, nameservers, and contact information associated with a domain or IP block.

Is WHOIS data always accurate?

Not always. Many domain registrars offer WHOIS privacy protection that replaces the registrant's personal details with proxy information. IP WHOIS data from Regional Internet Registries (RIRs) is generally more reliable than domain WHOIS data.

Can I use WHOIS to find who owns an IP address?

Yes. Enter any IP address into the WHOIS tool to find the organization that owns the IP block, the Regional Internet Registry (ARIN, RIPE, APNIC, etc.) that allocated it, and the network range it belongs to.

What is the difference between domain WHOIS and IP WHOIS?

Domain WHOIS shows registration details like the registrar, creation date, expiry date, and nameservers. IP WHOIS shows the network allocation, the organization that owns the IP block, and the abuse contact for reporting issues.

Why does WHOIS show privacy protection instead of real details?

Domain registrars offer WHOIS privacy services to protect registrants from spam, identity theft, and unwanted contact. GDPR regulations in Europe also require redaction of personal data from WHOIS records.

How often is WHOIS data updated?

WHOIS data is updated by the registrar or registry whenever changes are made to a domain or IP registration. Our tool queries the authoritative WHOIS server in real-time, with results cached for 7 days to reduce server load.

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