ASN AS17161 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS17161?

AS17161 is listed under Marsh Inc..

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.

How can I access the full ASN tables?

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AS17161 Marsh Inc. | IPGeolocation.io

ASN Lookup Tool

Marsh Inc. mmc.com

US 39 Routes

AS Data

AS17161

AS17161 – Marsh Inc.

AS Number	17161
AS Name	MMC
Organization	Marsh Inc. (marshi-1)
Country	US
Website	mmc.com
Number of IPv4 Routes	39
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2000-08-01

ASN Intelligence API for production workflows

Use ASN data for AS17161 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
167.245.12.0/22	AS17161	Marsh Inc.	Marsh Inc.	1024
205.156.132.0/23	AS17161	Marsh Inc.	Marsh Inc.	512
205.156.128.0/22	AS17161	Marsh Inc.	Marsh Inc.	1024
205.156.102.0/23	AS17161	Marsh Inc.	Marsh Inc.	512
205.156.64.0/21	AS17161	Marsh Inc.	Marsh Inc.	2048
168.168.150.0/24	AS17161	Marsh Inc.	Marsh & McLennan Companies, Inc.	256
167.245.20.0/22	AS17161	Marsh Inc.	Marsh Inc.	1024
167.245.160.0/19	AS17161	Marsh Inc.	Marsh Inc.	8192
205.156.64.0/22	AS17161	Marsh Inc.	Marsh Inc.	1024
205.156.144.0/21	AS17161	Marsh Inc.	Marsh Inc.	2048

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:       17161
ASName:         MMC
ASHandle:       AS17161
RegDate:        2000-08-01
Updated:        2022-12-02
Ref:            https://rdap.arin.net/registry/autnum/17161


OrgName:        Marsh Inc.
OrgId:          MARSHI-1
Address:        1166 Avenue of the Americas
City:           New York
StateProv:      NY
PostalCode:     10036
Country:        US
RegDate:        2000-08-01
Updated:        2022-06-14
Ref:            https://rdap.arin.net/registry/entity/MARSHI-1


OrgTechHandle: PMC288-ARIN
OrgTechName:   McGlynn, Patrick 
OrgTechPhone:  +1-201-284-3021 
OrgTechEmail:  patrick.mcglynn@mmc.com
OrgTechRef:    https://rdap.arin.net/registry/entity/PMC288-ARIN

OrgDNSHandle: VIHLI-ARIN
OrgDNSName:   Vihlidal, Brian 
OrgDNSPhone:  +1-502-561-4600 
OrgDNSEmail:  brian.vihlidal@mmc.com
OrgDNSRef:    https://rdap.arin.net/registry/entity/VIHLI-ARIN

OrgAbuseHandle: MMCAB-ARIN
OrgAbuseName:   MMC-Abuse
OrgAbusePhone:  +1-502-561-4600 
OrgAbuseEmail:  abuse@mmc.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/MMCAB-ARIN

OrgTechHandle: VIHLI-ARIN
OrgTechName:   Vihlidal, Brian 
OrgTechPhone:  +1-502-561-4600 
OrgTechEmail:  brian.vihlidal@mmc.com
OrgTechRef:    https://rdap.arin.net/registry/entity/VIHLI-ARIN

RTechHandle: PMC288-ARIN
RTechName:   McGlynn, Patrick 
RTechPhone:  +1-201-284-3021 
RTechEmail:  patrick.mcglynn@mmc.com
RTechRef:    https://rdap.arin.net/registry/entity/PMC288-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" : "17161",
    "as_handle" : "AS17161",
    "as_name" : "MMC",
    "admin_contacts" : [ "VIHLI-ARIN" ],
    "tech_contacts" : [ "PMC288-ARIN", "VIHLI-ARIN", "PMC288-ARIN" ],
    "abuse_contacts" : [ "MMCAB-ARIN" ],
    "date_created" : "2000-08-01",
    "date_updated" : "2022-12-02",
    "source" : "https://rdap.arin.net/registry/autnum/17161"
  } ],
  "organization" : {
    "handle" : "MARSHI-1",
    "name" : "Marsh Inc.",
    "address" : [ "1166 Avenue of the Americas", "New York", "NY", "10036", "US" ],
    "street" : "Avenue Of The Americas",
    "city" : "New York",
    "state" : "NY",
    "zip_code" : "10036",
    "country" : [ "US" ],
    "date_created" : "2000-08-01",
    "date_updated" : "2022-06-14",
    "source" : "https://rdap.arin.net/registry/entity/MARSHI-1",
    "addressCountry" : "US"
  },
  "administrative_contacts" : [ {
    "handle" : "VIHLI-ARIN",
    "name" : "Vihlidal, Brian",
    "email" : [ "brian.vihlidal@mmc.com" ],
    "phone" : [ "+1-502-561-4600" ],
    "source" : "https://rdap.arin.net/registry/entity/VIHLI-ARIN"
  } ],
  "technical_contacts" : [ {
    "handle" : "PMC288-ARIN",
    "name" : "McGlynn, Patrick",
    "email" : [ "patrick.mcglynn@mmc.com" ],
    "phone" : [ "+1-201-284-3021" ],
    "source" : "https://rdap.arin.net/registry/entity/PMC288-ARIN"
  }, {
    "handle" : "VIHLI-ARIN",
    "name" : "Vihlidal, Brian",
    "email" : [ "brian.vihlidal@mmc.com" ],
    "phone" : [ "+1-502-561-4600" ],
    "source" : "https://rdap.arin.net/registry/entity/VIHLI-ARIN"
  } ],
  "abuse_contacts" : [ {
    "handle" : "MMCAB-ARIN",
    "name" : "MMC-Abuse",
    "email" : [ "abuse@mmc.com" ],
    "phone" : [ "+1-502-561-4600" ],
    "source" : "https://rdap.arin.net/registry/entity/MMCAB-ARIN"
  } ]
}

Peers

AS Number	Description	Country
AS7474	SingTel Optus Pty Ltd	AU
AS15830	Equinix EMEA Acquisition Enterprises B.V.	NL
AS15830	Equinix (EMEA) Acquisition Enterprises B.V.	NL
AS4826	Vocus Connect International Backbone	AU
AS701	Verizon Business/UUnet	US
AS3356	Level 3 Parent, LLC	US
AS701	Verizon Business	US
AS4826	VOCUS PTY LTD	AU

Upstreams

AS Number	Description	Country
AS7474	SingTel Optus Pty Ltd	AU
AS15830	Equinix EMEA Acquisition Enterprises B.V.	NL
AS3356	Level 3 Parent, LLC	US
AS701	Verizon Business	US
AS4826	VOCUS PTY LTD	AU