ASN AS25958 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS25958?

AS25958 is listed under Marshfield Clinic 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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AS25958 Marshfield Clinic Inc.

ASN Lookup Tool

Marshfield Clinic Inc. marshfieldclinic.org

US 10 Routes

AS Data

AS25958

AS25958 – Marshfield Clinic Inc.

AS Number	25958
AS Name	MC-INT
Organization	Marshfield Clinic Inc.(mmref)
Country	US
Website	marshfieldclinic.org
Number of IPv4 Routes	10
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2017-10-10

ASN Intelligence API for production workflows

Use ASN data for AS25958 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
192.236.21.0/24	AS25958	Marshfield Clinic Inc.	Marshfield Clinic Inc.	256
192.236.22.0/24	AS25958	Marshfield Clinic Inc.	Marshfield Clinic Inc.	256
192.236.19.0/24	AS25958	Marshfield Clinic Inc.	Marshfield Clinic Inc.	256
192.236.16.0/21	AS25958	Marshfield Clinic Inc.	Marshfield Clinic Inc.	2048
192.236.18.0/24	AS25958	Marshfield Clinic Inc.	Marshfield Clinic Inc.	256
192.236.16.0/24	AS25958	Marshfield Clinic Inc.	Marshfield Clinic Inc.	256
192.236.17.0/24	AS25958	Marshfield Clinic Inc.	Marshfield Clinic Inc.	256
192.236.20.0/24	AS25958	Marshfield Clinic Inc.	Marshfield Clinic Inc.	256
192.236.23.0/24	AS25958	Marshfield Clinic Inc.	Marshfield Clinic Inc.	256
192.236.25.0/24	AS25958	Marshfield Clinic Inc.	Marshfield Clinic Inc.	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:       25958
ASName:         MC-INT
ASHandle:       AS25958
RegDate:        2017-10-10
Updated:        2017-10-10    
Ref:            https://rdap.arin.net/registry/autnum/25958


OrgName:        Marshfield Clinic Inc.
OrgId:          MMREF
Address:        1000 North Oak Avenue
City:           Marshfield
StateProv:      WI
PostalCode:     54449
Country:        US
RegDate:        1992-10-13
Updated:        2024-11-12
Ref:            https://rdap.arin.net/registry/entity/MMREF


OrgAbuseHandle: TMG19-ARIN
OrgAbuseName:   Gauerke, Todd Michael
OrgAbusePhone:  +1-715-383-4034 
OrgAbuseEmail:  gauerke.todd@marshfieldclinic.org
OrgAbuseRef:    https://rdap.arin.net/registry/entity/TMG19-ARIN

OrgAbuseHandle: ERDMA43-ARIN
OrgAbuseName:   Erdman, Mark 
OrgAbusePhone:  +1-715-221-8305 
OrgAbuseEmail:  erdman.mark@marshfieldclinic.org
OrgAbuseRef:    https://rdap.arin.net/registry/entity/ERDMA43-ARIN

OrgAbuseHandle: POPPY-ARIN
OrgAbuseName:   Poppy, Ben 
OrgAbusePhone:  +1-715-221-8075 
OrgAbuseEmail:  poppy.ben@marshfieldclinic.org
OrgAbuseRef:    https://rdap.arin.net/registry/entity/POPPY-ARIN

OrgTechHandle: ERDMA43-ARIN
OrgTechName:   Erdman, Mark 
OrgTechPhone:  +1-715-221-8305 
OrgTechEmail:  erdman.mark@marshfieldclinic.org
OrgTechRef:    https://rdap.arin.net/registry/entity/ERDMA43-ARIN

OrgTechHandle: POPPY-ARIN
OrgTechName:   Poppy, Ben 
OrgTechPhone:  +1-715-221-8075 
OrgTechEmail:  poppy.ben@marshfieldclinic.org
OrgTechRef:    https://rdap.arin.net/registry/entity/POPPY-ARIN

OrgTechHandle: TMG19-ARIN
OrgTechName:   Gauerke, Todd Michael
OrgTechPhone:  +1-715-383-4034 
OrgTechEmail:  gauerke.todd@marshfieldclinic.org
OrgTechRef:    https://rdap.arin.net/registry/entity/TMG19-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

Peers

AS Number	Description	Country
AS40264	Charter Communications LLC	US
AS11796	Airstream Communications, LLC	US

Upstreams

AS Number	Description	Country
AS40264	Charter Communications LLC	US
AS11796	Airstream Communications, LLC	US