ASN AS18789 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS18789?

AS18789 is listed under Main Line Health, 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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AS18789 Main Line Health, Inc.

ASN Lookup Tool

Main Line Health, Inc. mlhs.org

US 2 Routes

AS Data

AS18789

AS18789 – Main Line Health, Inc.

AS Number	18789
AS Name	NETMLH-AS
Organization	Main Line Health, Inc.(mlh)
Country	US
Website	mlhs.org
Number of IPv4 Routes	2
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2007-08-03

ASN Intelligence API for production workflows

Use ASN data for AS18789 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
208.88.12.0/22	AS198949	Radware Ltd	Main Line Health, Inc.	1024
192.104.254.0/24	AS18789	Main Line Health, Inc.	Main Line Health, 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:       18789
ASName:         NETMLH-AS
ASHandle:       AS18789
RegDate:        2007-08-03
Updated:        2022-12-05    
Ref:            https://rdap.arin.net/registry/autnum/18789


OrgName:        Main Line Health, Inc.
OrgId:          MLH
Address:        1180 W. Swedesford Road
Address:        SouthPoint 2, Suite 300
City:           Berwyn
StateProv:      PA
PostalCode:     19312
Country:        US
RegDate:        1991-06-21
Updated:        2013-12-03
Comment:        For abuse issues contact abuse@mlhs.org
Ref:            https://rdap.arin.net/registry/entity/MLH


OrgTechHandle: TECHN1254-ARIN
OrgTechName:   Technology Team
OrgTechPhone:  +1-484-596-4357 
OrgTechEmail:  hostmaster@mlhs.org
OrgTechRef:    https://rdap.arin.net/registry/entity/TECHN1254-ARIN

OrgAbuseHandle: TECHN1254-ARIN
OrgAbuseName:   Technology Team
OrgAbusePhone:  +1-484-596-4357 
OrgAbuseEmail:  hostmaster@mlhs.org
OrgAbuseRef:    https://rdap.arin.net/registry/entity/TECHN1254-ARIN

RNOCHandle: FLAHE54-ARIN
RNOCName:   Flaherty, Carl 
RNOCPhone:  +1-610-517-5134 
RNOCEmail:  flahertyc@mlhs.org
RNOCRef:    https://rdap.arin.net/registry/entity/FLAHE54-ARIN

RAbuseHandle: FLAHE54-ARIN
RAbuseName:   Flaherty, Carl 
RAbusePhone:  +1-610-517-5134 
RAbuseEmail:  flahertyc@mlhs.org
RAbuseRef:    https://rdap.arin.net/registry/entity/FLAHE54-ARIN

RTechHandle: FLAHE54-ARIN
RTechName:   Flaherty, Carl 
RTechPhone:  +1-610-517-5134 
RTechEmail:  flahertyc@mlhs.org
RTechRef:    https://rdap.arin.net/registry/entity/FLAHE54-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
AS3356	Level 3 Parent, LLC	US
AS6461	Zayo Bandwidth	US

Upstreams

AS Number	Description	Country
AS3356	Level 3 Parent, LLC	US
AS6461	Zayo Bandwidth	US