APNIC - Query the APNIC Whois Database

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To assist you with debugging problems, this whois query was received from IP Address

% APNIC found the following authoritative answer from: 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 1997-2025, American Registry for Internet Numbers, Ltd.
#

NetRange:       128.135.0.0 - 128.135.255.255
CIDR:           128.135.0.0/16
NetName:        U-CHICAGO
NetHandle:      NET-128-135-0-0-1
Parent:         NET128 (NET-128-0-0-0-0)
NetType:        Direct Allocation
OriginAS:       AS160
Organization:   The University of Chicago (UNIVER-174-Z)
RegDate:        1986-07-08
Updated:        2023-12-05
Ref:            https://rdap.arin.net/registry/ip/128.135.0.0

OrgName:        The University of Chicago
OrgId:          UNIVER-174-Z
Address:        1155 E. 60th Street
City:           Chicago
StateProv:      IL
PostalCode:     60637
Country:        US
RegDate:        2023-02-27
Updated:        2023-04-19
Ref:            https://rdap.arin.net/registry/entity/UNIVER-174-Z

OrgTechHandle: DOMAI99-ARIN
OrgTechName:   Domain Administrator
OrgTechPhone:  +1-773-702-7626 
OrgTechEmail:  domainadmin@uchicago.edu
OrgTechRef:    https://rdap.arin.net/registry/entity/DOMAI99-ARIN

OrgNOCHandle: DNO22-ARIN
OrgNOCName:   Data Network Operations
OrgNOCPhone:  +1-773-702-7626 
OrgNOCEmail:  noc@uchicago.edu
OrgNOCRef:    https://rdap.arin.net/registry/entity/DNO22-ARIN

OrgAbuseHandle: NSC26-ARIN
OrgAbuseName:   Network Security Center
OrgAbusePhone:  +1-773-702-2378 
OrgAbuseEmail:  security@uchicago.edu
OrgAbuseRef:    https://rdap.arin.net/registry/entity/NSC26-ARIN

RAbuseHandle: NSC26-ARIN
RAbuseName:   Network Security Center
RAbusePhone:  +1-773-702-2378 
RAbuseEmail:  security@uchicago.edu
RAbuseRef:    https://rdap.arin.net/registry/entity/NSC26-ARIN

RTechHandle: DOMAI99-ARIN
RTechName:   Domain Administrator
RTechPhone:  +1-773-702-7626 
RTechEmail:  domainadmin@uchicago.edu
RTechRef:    https://rdap.arin.net/registry/entity/DOMAI99-ARIN

RNOCHandle: DNO22-ARIN
RNOCName:   Data Network Operations
RNOCPhone:  +1-773-702-7626 
RNOCEmail:  noc@uchicago.edu
RNOCRef:    https://rdap.arin.net/registry/entity/DNO22-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 1997-2025, American Registry for Internet Numbers, Ltd.
#
  • Bold: Object type.
  • Underlined: Primary key(s).
  • Hyperlinks: Searchable Attributes.
10 records found for '128.135.73.21'
Search for  
IP address lookups Miscellaneous queries
-l

1st level less specific

 Returns smallest IP address range that includes the queried IP address or range

-i

Inverse attributes

 Returns objects with an attribute that matches the query text and attribute type
-L

All less specific

 Return all larger IP address ranges that include the queried IP address or range

-T

Object types

 Results that match the query and are of a specified object type
-m

1st level more specific

 Returns first level more specific address ranges within the boundaries of the queried IP address range
-M

All more specific

 Returns all more specific address ranges within the boundaries of the queried IP address range

Query hints

  • Include "AS" in front of an AS number.
    Example: AS4808

  • Include "-t" (template only) or "-v" (template and description) in front of an object name to view the template
    Example: -t inetnum

-x

Exact match only

 Returns address range that exactly matches the queried IP address range
-d

Associated reverse domain

 Returns IP address range and associated reverse domain

For more information see: