ASN AS21857 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS21857?

AS21857 is listed under ProHealth Care 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?

The page shows a preview of large ASN datasets. Use the page controls to load more rows, and upgrade to a paid plan for complete access.

AS21857 ProHealth Care Inc. | IPGeolocation.io

ASN Lookup Tool

ProHealth Care Inc. phci.org

US 6 Routes

AS Data

AS21857

AS21857 – ProHealth Care Inc.

AS Number	21857
AS Name	PROHEALTH-CARE
Organization	ProHealth Care Inc.(prohea-3)
Country	US
Website	phci.org
Number of IPv4 Routes	6
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2001-06-29

ASN Intelligence API for production workflows

Use ASN data for AS21857 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
147.185.119.0/24	AS21857	ProHealth Care Inc.	ProHealth Care Inc.	256
207.67.109.0/24	AS21857	ProHealth Care Inc.	Waukesha Health Systems	256
147.185.118.0/24	AS21857	ProHealth Care Inc.	ProHealth Care Inc.	256
147.185.116.0/24	AS21857	ProHealth Care Inc.	ProHealth Care Inc.	256
147.185.117.0/24	AS21857	ProHealth Care Inc.	ProHealth Care Inc.	256
147.185.116.0/22	AS21857	ProHealth Care Inc.	ProHealth Care Inc.	1024

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:       21857
ASName:         PROHEALTH-CARE
ASHandle:       AS21857
RegDate:        2001-06-29
Updated:        2019-02-05
Comment:        http://prohealthcare.org    
Ref:            https://rdap.arin.net/registry/autnum/21857


OrgName:        ProHealth Care Inc.
OrgId:          PROHEA-3
Address:        N17 W24100 Riverwood Dr.
City:           Waukesha
StateProv:      WI
PostalCode:     53188-5099
Country:        US
RegDate:        2001-06-29
Updated:        2019-02-05
Ref:            https://rdap.arin.net/registry/entity/PROHEA-3


OrgNOCHandle: MPESH-ARIN
OrgNOCName:   Mpesha, Philipe 
OrgNOCPhone:  +1-262-696-0363 
OrgNOCEmail:  philipe.mpesha@phci.org
OrgNOCRef:    https://rdap.arin.net/registry/entity/MPESH-ARIN

OrgTechHandle: MPESH-ARIN
OrgTechName:   Mpesha, Philipe 
OrgTechPhone:  +1-262-696-0363 
OrgTechEmail:  philipe.mpesha@phci.org
OrgTechRef:    https://rdap.arin.net/registry/entity/MPESH-ARIN

OrgAbuseHandle: MPESH-ARIN
OrgAbuseName:   Mpesha, Philipe 
OrgAbusePhone:  +1-262-696-0363 
OrgAbuseEmail:  philipe.mpesha@phci.org
OrgAbuseRef:    https://rdap.arin.net/registry/entity/MPESH-ARIN

RNOCHandle: MPESH-ARIN
RNOCName:   Mpesha, Philipe 
RNOCPhone:  +1-262-696-0363 
RNOCEmail:  philipe.mpesha@phci.org
RNOCRef:    https://rdap.arin.net/registry/entity/MPESH-ARIN

RAbuseHandle: MPESH-ARIN
RAbuseName:   Mpesha, Philipe 
RAbusePhone:  +1-262-696-0363 
RAbuseEmail:  philipe.mpesha@phci.org
RAbuseRef:    https://rdap.arin.net/registry/entity/MPESH-ARIN

RTechHandle: MPESH-ARIN
RTechName:   Mpesha, Philipe 
RTechPhone:  +1-262-696-0363 
RTechEmail:  philipe.mpesha@phci.org
RTechRef:    https://rdap.arin.net/registry/entity/MPESH-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
AS3549	Level 3 Communications, Inc. (GBLX)	US
AS3356	Level 3 Parent, LLC	US

Upstreams

AS Number	Description	Country
AS3356	Level 3 Parent, LLC	US