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WHOIS

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

Query
72.36.1.158
IANA
whois.iana.org
Referred
whois.arin.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.arin.net

inetnum:      72.0.0.0 - 72.255.255.255
organisation: ARIN
status:       ALLOCATED

whois:        whois.arin.net

changed:      2004-08
source:       IANA

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

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#


#
# Query terms are ambiguous.  The query is assumed to be:
#     "n 72.36.1.158"
#
# Use "?" to get help.
#

NetRange:       72.36.0.0 - 72.36.63.255
CIDR:           72.36.0.0/18
NetName:        ADVANCED-COMMUNICATIONS-TECHNOLOGY
NetHandle:      NET-72-36-0-0-1
Parent:         NET72 (NET-72-0-0-0-0)
NetType:        Direct Allocation
OriginAS:       
Organization:   Advanced Communications Technology (ACT-94)
RegDate:        2005-02-17
Updated:        2012-03-02
Ref:            https://rdap.arin.net/registry/ip/72.36.0.0


OrgName:        Advanced Communications Technology
OrgId:          ACT-94
Address:        290 N Brooks St
Address:        PO Box 7039
City:           Sheridan
StateProv:      WY
PostalCode:     82801
Country:        US
RegDate:        2002-11-07
Updated:        2017-01-28
Ref:            https://rdap.arin.net/registry/entity/ACT-94


OrgNOCHandle: AID1-ARIN
OrgNOCName:   ACT ISP Department
OrgNOCPhone:  +1-307-673-0910 
OrgNOCEmail:  isp@acthq.net
OrgNOCRef:    https://rdap.arin.net/registry/entity/AID1-ARIN

OrgAbuseHandle: AIAD2-ARIN
OrgAbuseName:   ACT ISP Abuse Department
OrgAbusePhone:  +1-307-673-0910 
OrgAbuseEmail:  abuse@acthq.net
OrgAbuseRef:    https://rdap.arin.net/registry/entity/AIAD2-ARIN

OrgTechHandle: AID1-ARIN
OrgTechName:   ACT ISP Department
OrgTechPhone:  +1-307-673-0910 
OrgTechEmail:  isp@acthq.net
OrgTechRef:    https://rdap.arin.net/registry/entity/AID1-ARIN

RAbuseHandle: AIAD2-ARIN
RAbuseName:   ACT ISP Abuse Department
RAbusePhone:  +1-307-673-0910 
RAbuseEmail:  abuse@acthq.net
RAbuseRef:    https://rdap.arin.net/registry/entity/AIAD2-ARIN

RNOCHandle: AID1-ARIN
RNOCName:   ACT ISP Department
RNOCPhone:  +1-307-673-0910 
RNOCEmail:  isp@acthq.net
RNOCRef:    https://rdap.arin.net/registry/entity/AID1-ARIN

RTechHandle: AID1-ARIN
RTechName:   ACT ISP Department
RTechPhone:  +1-307-673-0910 
RTechEmail:  isp@acthq.net
RTechRef:    https://rdap.arin.net/registry/entity/AID1-ARIN


#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#

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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