ASN AS26738 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS26738?

AS26738 is listed under Deerfield Partners, L.P..

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.

AS26738 Deerfield Partners, L.P.

ASN Lookup Tool

Deerfield Partners, L.P. deerfieldpartners.com

US 1 Routes

AS Data

AS26738

AS26738 – Deerfield Partners, L.P.

AS Number	26738
AS Name	DEERFIELD
Organization	Deerfield Partners, L.P.(deerf)
Country	US
Website	deerfieldpartners.com
Number of IPv4 Routes	1
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2002-11-13

ASN Intelligence API for production workflows

Use ASN data for AS26738 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
38.105.163.0/24	AS26738	Deerfield Partners, L.P.	Deerfield Management LP	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:       26738
ASName:         DEERFIELD
ASHandle:       AS26738
RegDate:        2002-11-13
Updated:        2017-09-22
Comment:        Multi homed due to lack of cofidence in the telco
Comment:        industry    
Ref:            https://rdap.arin.net/registry/autnum/26738


OrgName:        Deerfield Partners, L.P.
OrgId:          DEERF
Address:        780 3rd Ave
Address:        37th floor
City:           New York
StateProv:      NY
PostalCode:     10017
Country:        US
RegDate:        2002-10-21
Updated:        2012-09-05
Ref:            https://rdap.arin.net/registry/entity/DEERF


OrgAbuseHandle: ITSUP40-ARIN
OrgAbuseName:   IT Support
OrgAbusePhone:  +1-212-551-1600 
OrgAbuseEmail:  ITSupport@deerfieldpartners.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/ITSUP40-ARIN

OrgTechHandle: ITSUP40-ARIN
OrgTechName:   IT Support
OrgTechPhone:  +1-212-551-1600 
OrgTechEmail:  ITSupport@deerfieldpartners.com
OrgTechRef:    https://rdap.arin.net/registry/entity/ITSUP40-ARIN

OrgNOCHandle: ITSUP40-ARIN
OrgNOCName:   IT Support
OrgNOCPhone:  +1-212-551-1600 
OrgNOCEmail:  ITSupport@deerfieldpartners.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/ITSUP40-ARIN

RAbuseHandle: DEERF-ARIN
RAbuseName:   DeerfieldARIN 
RAbusePhone:  +1-212-551-1600 
RAbuseEmail:  IT@deerfield.com
RAbuseRef:    https://rdap.arin.net/registry/entity/DEERF-ARIN

RNOCHandle: DEERF-ARIN
RNOCName:   DeerfieldARIN 
RNOCPhone:  +1-212-551-1600 
RNOCEmail:  IT@deerfield.com
RNOCRef:    https://rdap.arin.net/registry/entity/DEERF-ARIN

RTechHandle: DEERF-ARIN
RTechName:   DeerfieldARIN 
RTechPhone:  +1-212-551-1600 
RTechEmail:  IT@deerfield.com
RTechRef:    https://rdap.arin.net/registry/entity/DEERF-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
AS12271	Charter Communications Inc	US
AS3356	Level 3 Parent, LLC	US

Upstreams

AS Number	Description	Country
AS12271	Charter Communications Inc	US
AS3356	Level 3 Parent, LLC	US