What is ASN AS397040?

ASN AS397040 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS397040?

AS397040 is listed under Supernus Pharmaceuticals, 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.

AS397040 Supernus Pharmaceuticals, Inc.

ASN Lookup Tool

Supernus Pharmaceuticals, Inc. supernus.com

US 1 Routes

AS Data

AS397040

AS397040 – Supernus Pharmaceuticals, Inc.

AS Number	397040
AS Name	SUPN-INT
Organization	Supernus Pharmaceuticals, Inc.(sp-818)
Country	US
Website	supernus.com
Number of IPv4 Routes	1
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2018-09-06

ASN Intelligence API for production workflows

Use ASN data for AS397040 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

Access complete peers, upstreams, downstreams, routes, WHOIS, and contact intelligence via our API. Learn more

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
204.106.16.0/24	AS397040	Supernus Pharmaceuticals, Inc.	Supernus Pharmaceuticals, 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:       397040
ASName:         SUPN-INT
ASHandle:       AS397040
RegDate:        2018-09-06
Updated:        2022-06-17    
Ref:            https://rdap.arin.net/registry/autnum/397040


OrgName:        Supernus Pharmaceuticals, Inc.
OrgId:          SP-818
Address:        9715 Key West Avenue
City:           Rockville
StateProv:      MD
PostalCode:     20850
Country:        US
RegDate:        2017-10-23
Updated:        2022-06-17
Ref:            https://rdap.arin.net/registry/entity/SP-818


OrgAbuseHandle: ITADM249-ARIN
OrgAbuseName:   IT Admin
OrgAbusePhone:  +1-301-838-2698 
OrgAbuseEmail:  itadmin@supernus.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/ITADM249-ARIN

OrgNOCHandle: ITADM249-ARIN
OrgNOCName:   IT Admin
OrgNOCPhone:  +1-301-838-2698 
OrgNOCEmail:  itadmin@supernus.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/ITADM249-ARIN

OrgTechHandle: ITADM249-ARIN
OrgTechName:   IT Admin
OrgTechPhone:  +1-301-838-2698 
OrgTechEmail:  itadmin@supernus.com
OrgTechRef:    https://rdap.arin.net/registry/entity/ITADM249-ARIN

RTechHandle: ITADM249-ARIN
RTechName:   IT Admin
RTechPhone:  +1-301-838-2698 
RTechEmail:  itadmin@supernus.com
RTechRef:    https://rdap.arin.net/registry/entity/ITADM249-ARIN

RNOCHandle: ITADM249-ARIN
RNOCName:   IT Admin
RNOCPhone:  +1-301-838-2698 
RNOCEmail:  itadmin@supernus.com
RNOCRef:    https://rdap.arin.net/registry/entity/ITADM249-ARIN

RAbuseHandle: ITADM249-ARIN
RAbuseName:   IT Admin
RAbusePhone:  +1-301-838-2698 
RAbuseEmail:  itadmin@supernus.com
RAbuseRef:    https://rdap.arin.net/registry/entity/ITADM249-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
AS46887	Crown Castle Fiber LLC	US
AS3549	Level 3 Communications, Inc. (GBLX)	US
AS3356	Level 3 Parent, LLC	US

Upstreams

AS Number	Description	Country
AS46887	Crown Castle Fiber LLC	US
AS3356	Level 3 Parent, LLC	US