ASN AS55157 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS55157?

AS55157 is listed under Colliers International.

What do peers, upstreams, and downstreams mean in ASN data?

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 shown for an ASN?

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

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AS55157 Colliers International

ASN Lookup Tool

Colliers International colliers.com

US 2 Routes

AS Data

AS55157

AS55157 – Colliers International

AS Number	55157
AS Name	COLLIERS
Organization	Colliers International (ciwl)
Country	US
Website	colliers.com
Number of IPv4 Routes	2
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2013-03-19

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
203.18.180.0/24	AS55157	Colliers International	Colliers International Holdings AUSTRALIA Limited	256
203.18.183.0/24	AS55157	Colliers International	Colliers International Holdings AUSTRALIA Limited	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:       55157
ASName:         COLLIERS
ASHandle:       AS55157
RegDate:        2013-03-19
Updated:        2013-03-19
Ref:            https://rdap.arin.net/registry/autnum/55157


OrgName:        Colliers International
OrgId:          CIWL
Address:        601 Union Street, Suite 4800
City:           Seattle
StateProv:      WA
PostalCode:     98101
Country:        US
RegDate:        2013-01-25
Updated:        2023-03-27
Ref:            https://rdap.arin.net/registry/entity/CIWL


OrgNOCHandle: HYTTI-ARIN
OrgNOCName:   Hyttinen, Saku 
OrgNOCPhone:  +1-212-716-3610 
OrgNOCEmail:  saku.hyttinen@colliers.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/HYTTI-ARIN

OrgRoutingHandle: SEARC22-ARIN
OrgRoutingName:   Searchfield, Bede 
OrgRoutingPhone:  +1-604-340-6199 
OrgRoutingEmail:  bede.searchfield@colliers.com
OrgRoutingRef:    https://rdap.arin.net/registry/entity/SEARC22-ARIN

OrgTechHandle: SEARC22-ARIN
OrgTechName:   Searchfield, Bede 
OrgTechPhone:  +1-604-340-6199 
OrgTechEmail:  bede.searchfield@colliers.com
OrgTechRef:    https://rdap.arin.net/registry/entity/SEARC22-ARIN

OrgAbuseHandle: HYTTI-ARIN
OrgAbuseName:   Hyttinen, Saku 
OrgAbusePhone:  +1-212-716-3610 
OrgAbuseEmail:  saku.hyttinen@colliers.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/HYTTI-ARIN

OrgAbuseHandle: SEARC22-ARIN
OrgAbuseName:   Searchfield, Bede 
OrgAbusePhone:  +1-604-340-6199 
OrgAbuseEmail:  bede.searchfield@colliers.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/SEARC22-ARIN

OrgDNSHandle: SEARC22-ARIN
OrgDNSName:   Searchfield, Bede 
OrgDNSPhone:  +1-604-340-6199 
OrgDNSEmail:  bede.searchfield@colliers.com
OrgDNSRef:    https://rdap.arin.net/registry/entity/SEARC22-ARIN

OrgTechHandle: HYTTI-ARIN
OrgTechName:   Hyttinen, Saku 
OrgTechPhone:  +1-212-716-3610 
OrgTechEmail:  saku.hyttinen@colliers.com
OrgTechRef:    https://rdap.arin.net/registry/entity/HYTTI-ARIN

OrgDNSHandle: HYTTI-ARIN
OrgDNSName:   Hyttinen, Saku 
OrgDNSPhone:  +1-212-716-3610 
OrgDNSEmail:  saku.hyttinen@colliers.com
OrgDNSRef:    https://rdap.arin.net/registry/entity/HYTTI-ARIN

OrgNOCHandle: SEARC22-ARIN
OrgNOCName:   Searchfield, Bede 
OrgNOCPhone:  +1-604-340-6199 
OrgNOCEmail:  bede.searchfield@colliers.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/SEARC22-ARIN

OrgRoutingHandle: HYTTI-ARIN
OrgRoutingName:   Hyttinen, Saku 
OrgRoutingPhone:  +1-212-716-3610 
OrgRoutingEmail:  saku.hyttinen@colliers.com
OrgRoutingRef:    https://rdap.arin.net/registry/entity/HYTTI-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" : "55157",
    "as_handle" : "AS55157",
    "as_name" : "COLLIERS",
    "admin_contacts" : [ "SEARC22-ARIN", "HYTTI-ARIN" ],
    "tech_contacts" : [ "SEARC22-ARIN", "SEARC22-ARIN", "HYTTI-ARIN", "HYTTI-ARIN" ],
    "abuse_contacts" : [ "HYTTI-ARIN", "SEARC22-ARIN" ],
    "date_created" : "2013-03-19",
    "date_updated" : "2013-03-19",
    "source" : "https://rdap.arin.net/registry/autnum/55157"
  } ],
  "organization" : {
    "handle" : "CIWL",
    "name" : "Colliers International",
    "address" : [ "601 Union Street, Suite 4800", "Seattle", "WA", "98101", "US" ],
    "street" : "Union Street",
    "city" : "Seattle",
    "state" : "WA",
    "zip_code" : "98101",
    "country" : [ "US" ],
    "date_created" : "2013-01-25",
    "date_updated" : "2023-03-27",
    "source" : "https://rdap.arin.net/registry/entity/CIWL",
    "addressCountry" : "US"
  },
  "administrative_contacts" : [ {
    "handle" : "SEARC22-ARIN",
    "name" : "Searchfield, Bede",
    "email" : [ "bede.searchfield@colliers.com" ],
    "phone" : [ "+1-604-340-6199" ],
    "source" : "https://rdap.arin.net/registry/entity/SEARC22-ARIN"
  }, {
    "handle" : "HYTTI-ARIN",
    "name" : "Hyttinen, Saku",
    "email" : [ "saku.hyttinen@colliers.com" ],
    "phone" : [ "+1-212-716-3610" ],
    "source" : "https://rdap.arin.net/registry/entity/HYTTI-ARIN"
  } ],
  "technical_contacts" : [ {
    "handle" : "SEARC22-ARIN",
    "name" : "Searchfield, Bede",
    "email" : [ "bede.searchfield@colliers.com" ],
    "phone" : [ "+1-604-340-6199" ],
    "source" : "https://rdap.arin.net/registry/entity/SEARC22-ARIN"
  }, {
    "handle" : "HYTTI-ARIN",
    "name" : "Hyttinen, Saku",
    "email" : [ "saku.hyttinen@colliers.com" ],
    "phone" : [ "+1-212-716-3610" ],
    "source" : "https://rdap.arin.net/registry/entity/HYTTI-ARIN"
  } ],
  "abuse_contacts" : [ {
    "handle" : "HYTTI-ARIN",
    "name" : "Hyttinen, Saku",
    "email" : [ "saku.hyttinen@colliers.com" ],
    "phone" : [ "+1-212-716-3610" ],
    "source" : "https://rdap.arin.net/registry/entity/HYTTI-ARIN"
  }, {
    "handle" : "SEARC22-ARIN",
    "name" : "Searchfield, Bede",
    "email" : [ "bede.searchfield@colliers.com" ],
    "phone" : [ "+1-604-340-6199" ],
    "source" : "https://rdap.arin.net/registry/entity/SEARC22-ARIN"
  } ]
}

Peers

AS Number	Description	Country
AS2764	AAPT Limited	AU

Upstreams

AS Number	Description	Country
AS2764	AAPT Limited	AU