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AS23237 McMaster University | IPGeolocation.io

Q: Why is WHOIS data shown for an ASN?

WHOIS data provides registration and contact context for ASN ownership, administration, and operational reference.

ASN Lookup Tool

McMaster University mcmaster.ca

CA 5 Routes

AS Data

AS23237

AS23237 – McMaster University

AS Number	23237
AS Name	MCMASTER
Organization	McMaster University (mu)
Country	CA
Website	mcmaster.ca
Number of IPv4 Routes	4
Number of IPv6 Routes	1
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2002-02-13

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Use ASN data for AS23237 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
192.42.5.0/24	AS23237	McMaster University	McMaster University	256
192.42.6.0/24	AS23237	McMaster University	McMaster University	256
2604:1700::/48	AS23237	McMaster University	McMaster University	~1×10²⁴
130.113.0.0/16	AS23237	McMaster University	McMaster University	65536
130.113.109.0/24	AS23237	McMaster University	McMaster University	256

Raw Whois Response

#
# 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.
#


ASNumber:       23237
ASName:         MCMASTER
ASHandle:       AS23237
RegDate:        2002-02-13
Updated:        2012-03-02
Ref:            https://rdap.arin.net/registry/autnum/23237


OrgName:        McMaster University
OrgId:          MU
Address:        1280 Main St. West
City:           Hamilton
StateProv:      ON
PostalCode:     L8S-4M1
Country:        CA
RegDate:        1988-08-04
Updated:        2025-10-14
Ref:            https://rdap.arin.net/registry/entity/MU


OrgTechHandle: MDD4-ARIN
OrgTechName:   Diggins, Mike Donald
OrgTechPhone:  +1-905-522-0511 
OrgTechEmail:  mike.diggins@mcmaster.ca
OrgTechRef:    https://rdap.arin.net/registry/entity/MDD4-ARIN

OrgAbuseHandle: MDD4-ARIN
OrgAbuseName:   Diggins, Mike Donald
OrgAbusePhone:  +1-905-522-0511 
OrgAbuseEmail:  mike.diggins@mcmaster.ca
OrgAbuseRef:    https://rdap.arin.net/registry/entity/MDD4-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.
#

Parsed Whois Response

{
  "status" : true,
  "whois_server" : "whois.arin.net",
  "aut_nums" : [ {
    "aut_num" : "23237",
    "as_handle" : "AS23237",
    "as_name" : "MCMASTER",
    "tech_contacts" : [ "MDD4-ARIN" ],
    "abuse_contacts" : [ "MDD4-ARIN" ],
    "date_created" : "2002-02-13",
    "date_updated" : "2012-03-02",
    "source" : "https://rdap.arin.net/registry/autnum/23237"
  } ],
  "organization" : {
    "handle" : "MU",
    "name" : "McMaster University",
    "address" : [ "1280 Main St. West", "Hamilton", "ON", "L8S-4M1", "CA" ],
    "street" : "Main St. West",
    "city" : "Hamilton",
    "state" : "ON",
    "zip_code" : "L8S-4M1",
    "country" : [ "CA" ],
    "date_created" : "1988-08-04",
    "date_updated" : "2025-10-14",
    "source" : "https://rdap.arin.net/registry/entity/MU",
    "addressCountry" : "CA"
  },
  "technical_contacts" : [ {
    "handle" : "MDD4-ARIN",
    "name" : "Diggins, Mike Donald",
    "email" : [ "mike.diggins@mcmaster.ca" ],
    "phone" : [ "+1-905-522-0511" ],
    "source" : "https://rdap.arin.net/registry/entity/MDD4-ARIN"
  } ],
  "abuse_contacts" : [ {
    "handle" : "MDD4-ARIN",
    "name" : "Diggins, Mike Donald",
    "email" : [ "mike.diggins@mcmaster.ca" ],
    "phone" : [ "+1-905-522-0511" ],
    "source" : "https://rdap.arin.net/registry/entity/MDD4-ARIN"
  } ]
}

Peers

AS Number	Description	Country
AS26677	ORION	CA
AS7992	Cogeco Connexion Inc.	CA

Upstreams

AS Number	Description	Country
AS26677	ORION	CA
AS7992	Cogeco Connexion Inc.	CA

Frequently Asked Questions

What is ASN AS23237?

ASN AS23237 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS23237?

AS23237 is listed under McMaster University.

What do peers, upstreams, and downstreams mean?

Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.

What are routes and IP ranges for an ASN?

Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.

Why is WHOIS data included here?

WHOIS provides registration and contact context for ASN ownership, administration, and operational reference.

How can I access full ASN table data?

This page previews large ASN datasets. Use See more to load additional rows, and upgrade your plan to view complete peer, route, upstream, and downstream data.