ASN AS19661 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS19661?

AS19661 is listed under Susquehanna International Group, LLP.

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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AS19661 Susquehanna International Group, LLP

ASN Lookup Tool

Susquehanna International Group, LLP sig.com

US 13 Routes

AS Data

AS19661

AS19661 – Susquehanna International Group, LLP

AS Number	19661
AS Name	SUSQ-BALA
Organization	Susquehanna International Group, LLP (susque-7)
Country	US
Website	sig.com
Number of IPv4 Routes	12
Number of IPv6 Routes	1
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2001-01-31

ASN Intelligence API for production workflows

Use ASN data for AS19661 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
141.162.101.0/24	AS19661	Susquehanna International Group, LLP	Susquehanna Investment Group, GP	256
141.162.64.0/19	AS19661	Susquehanna International Group, LLP	Susquehanna Investment Group, GP	8192
141.162.81.0/24	AS19661	Susquehanna International Group, LLP	Susquehanna Investment Group, GP	256
141.162.128.0/17	AS19661	Susquehanna International Group, LLP	Susquehanna Investment Group, GP	32768
141.162.255.0/24	AS19661	Susquehanna International Group, LLP	Susquehanna Investment Group, GP	256
141.162.110.0/24	AS19661	Susquehanna International Group, LLP	Susquehanna Investment Group, GP	256
141.162.42.0/24	AS19661	Susquehanna International Group, LLP	Susquehanna Investment Group, GP	256
2602:808:c000::/48	AS19661	Susquehanna International Group, LLP	Susquehanna International Group, LLP	~1×10²⁴
141.162.102.0/24	AS19661	Susquehanna International Group, LLP	Susquehanna Investment Group, GP	256
141.162.4.0/24	AS19661	Susquehanna International Group, LLP	Susquehanna Investment Group, GP	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:       19661
ASName:         SUSQ-BALA
ASHandle:       AS19661
RegDate:        2001-01-31
Updated:        2019-01-09
Ref:            https://rdap.arin.net/registry/autnum/19661


OrgName:        Susquehanna International Group, LLP
OrgId:          SUSQUE-7
Address:        401 City Avenue
City:           Bala Cynwyd
StateProv:      PA
PostalCode:     19004
Country:        US
RegDate:        2000-06-22
Updated:        2020-08-24
Ref:            https://rdap.arin.net/registry/entity/SUSQUE-7


OrgNOCHandle: NOC2081-ARIN
OrgNOCName:   Network Operations Center
OrgNOCPhone:  +1-610-617-2755 
OrgNOCEmail:  backbone@sig.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/NOC2081-ARIN

OrgAbuseHandle: BELFI-ARIN
OrgAbuseName:   Belfie, Frank 
OrgAbusePhone:  +1-610-617-2764 
OrgAbuseEmail:  frank.belfie@sig.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/BELFI-ARIN

OrgTechHandle: JGR45-ARIN
OrgTechName:   Griner, Jeremy 
OrgTechPhone:  +1-610-617-2718 
OrgTechEmail:  griner@sig.com
OrgTechRef:    https://rdap.arin.net/registry/entity/JGR45-ARIN

OrgTechHandle: BELFI-ARIN
OrgTechName:   Belfie, Frank 
OrgTechPhone:  +1-610-617-2764 
OrgTechEmail:  frank.belfie@sig.com
OrgTechRef:    https://rdap.arin.net/registry/entity/BELFI-ARIN

RTechHandle: BELFI-ARIN
RTechName:   Belfie, Frank 
RTechPhone:  +1-610-617-2764 
RTechEmail:  frank.belfie@sig.com
RTechRef:    https://rdap.arin.net/registry/entity/BELFI-ARIN

RAbuseHandle: BELFI-ARIN
RAbuseName:   Belfie, Frank 
RAbusePhone:  +1-610-617-2764 
RAbuseEmail:  frank.belfie@sig.com
RAbuseRef:    https://rdap.arin.net/registry/entity/BELFI-ARIN

RNOCHandle: BELFI-ARIN
RNOCName:   Belfie, Frank 
RNOCPhone:  +1-610-617-2764 
RNOCEmail:  frank.belfie@sig.com
RNOCRef:    https://rdap.arin.net/registry/entity/BELFI-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

{
  "status" : true,
  "whois_server" : "whois.arin.net",
  "aut_nums" : [ {
    "aut_num" : "19661",
    "as_handle" : "AS19661",
    "as_name" : "SUSQ-BALA",
    "tech_contacts" : [ "JGR45-ARIN", "BELFI-ARIN", "BELFI-ARIN" ],
    "abuse_contacts" : [ "BELFI-ARIN", "BELFI-ARIN" ],
    "date_created" : "2001-01-31",
    "date_updated" : "2019-01-09",
    "source" : "https://rdap.arin.net/registry/autnum/19661"
  } ],
  "organization" : {
    "handle" : "SUSQUE-7",
    "name" : "Susquehanna International Group, LLP",
    "address" : [ "401 City Avenue", "Bala Cynwyd", "PA", "19004", "US" ],
    "street" : "City Avenue",
    "city" : "Bala Cynwyd",
    "state" : "PA",
    "zip_code" : "19004",
    "country" : [ "US" ],
    "date_created" : "2000-06-22",
    "date_updated" : "2020-08-24",
    "source" : "https://rdap.arin.net/registry/entity/SUSQUE-7",
    "addressCountry" : "US"
  },
  "technical_contacts" : [ {
    "handle" : "JGR45-ARIN",
    "name" : "Griner, Jeremy",
    "email" : [ "griner@sig.com" ],
    "phone" : [ "+1-610-617-2718" ],
    "source" : "https://rdap.arin.net/registry/entity/JGR45-ARIN"
  }, {
    "handle" : "BELFI-ARIN",
    "name" : "Belfie, Frank",
    "email" : [ "frank.belfie@sig.com" ],
    "phone" : [ "+1-610-617-2764" ],
    "source" : "https://rdap.arin.net/registry/entity/BELFI-ARIN"
  } ],
  "abuse_contacts" : [ {
    "handle" : "BELFI-ARIN",
    "name" : "Belfie, Frank",
    "email" : [ "frank.belfie@sig.com" ],
    "phone" : [ "+1-610-617-2764" ],
    "source" : "https://rdap.arin.net/registry/entity/BELFI-ARIN"
  } ]
}

Peers

AS Number	Description	Country
AS38195	Superloop	AU
AS46887	Crown Castle Fiber LLC	US
AS9255	Singapore Telecom	SG
AS2764	AAPT Limited	AU
AS6939	Hurricane Electric LLC	US
AS9255	Singapore Telecom, ConnectPlus	SG
AS3356	Level 3 Parent, LLC	US
AS6461	Zayo Bandwidth	US
AS38195	SUPERLOOP AUSTRALIA PTY LTD	AU

Upstreams

AS Number	Description	Country
AS46887	Crown Castle Fiber LLC	US
AS2764	AAPT Limited	AU
AS6939	Hurricane Electric LLC	US
AS9255	Singapore Telecom, ConnectPlus	SG
AS3356	Level 3 Parent, LLC	US
AS6461	Zayo Bandwidth	US
AS38195	SUPERLOOP AUSTRALIA PTY LTD	AU