ASN AS40521 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS40521?

AS40521 is listed under Bluefin Trading, LLC.

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.

AS40521 Bluefin Trading, LLC | IPGeolocation.io

ASN Lookup Tool

Bluefin Trading, LLC bfcm.com

US 1 Routes

AS Data

AS40521

AS40521 – Bluefin Trading, LLC

AS Number	40521
AS Name	BLUEFIN-TRADING
Organization	Bluefin Trading, LLC(btl-35)
Country	US
Website	bfcm.com
Number of IPv4 Routes	1
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2007-05-02

ASN Intelligence API for production workflows

Use ASN data for AS40521 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
198.251.31.0/24	AS40521	Bluefin Trading, LLC	Bluefin Trading, LLC	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:       40521
ASName:         BLUEFIN-TRADING
ASHandle:       AS40521
RegDate:        2007-05-02
Updated:        2012-03-02    
Ref:            https://rdap.arin.net/registry/autnum/40521


OrgName:        Bluefin Trading, LLC
OrgId:          BTL-35
Address:        41 Madison Avenue
Address:        36th Floor
City:           New York
StateProv:      NY
PostalCode:     10010
Country:        US
RegDate:        2007-01-11
Updated:        2021-05-26
Ref:            https://rdap.arin.net/registry/entity/BTL-35


OrgAbuseHandle: HOSTM912-ARIN
OrgAbuseName:   Hostmaster
OrgAbusePhone:  +1-212-457-9150 
OrgAbuseEmail:  hostmaster@bfcm.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/HOSTM912-ARIN

OrgTechHandle: HOSTM912-ARIN
OrgTechName:   Hostmaster
OrgTechPhone:  +1-212-457-9150 
OrgTechEmail:  hostmaster@bfcm.com
OrgTechRef:    https://rdap.arin.net/registry/entity/HOSTM912-ARIN

RAbuseHandle: HOSTM912-ARIN
RAbuseName:   Hostmaster
RAbusePhone:  +1-212-457-9150 
RAbuseEmail:  hostmaster@bfcm.com
RAbuseRef:    https://rdap.arin.net/registry/entity/HOSTM912-ARIN

RNOCHandle: HOSTM912-ARIN
RNOCName:   Hostmaster
RNOCPhone:  +1-212-457-9150 
RNOCEmail:  hostmaster@bfcm.com
RNOCRef:    https://rdap.arin.net/registry/entity/HOSTM912-ARIN

RTechHandle: HOSTM912-ARIN
RTechName:   Hostmaster
RTechPhone:  +1-212-457-9150 
RTechEmail:  hostmaster@bfcm.com
RTechRef:    https://rdap.arin.net/registry/entity/HOSTM912-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
AS286	GTT Communications Inc.	NL
AS286	GTT Communications Inc.	US
AS3257	GTT Communications Inc.	US

Upstreams

AS Number	Description	Country
AS286	GTT Communications Inc.	US
AS3257	GTT Communications Inc.	US