This AS is not currently used to announce prefixes in the global routing table, nor is it used as a visible transit AS.
Advertisements that are fragments of the original RIR allocation (more specifics) originated by this AS.
AS36557 1 More Specifics 1 Total Advertisements COWEN-INC, US
209.249.50.0/24 209.249.0.0/16
whois: 402590
IANA has recorded AS36557 as originally allocated by
/usr/bin/whois -h jwhois.apnic.netr "AS36557\n
#
# 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/
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# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#
ASNumber: 36557
ASName: COWEN-INC
ASHandle: AS36557
RegDate: 2006-01-31
Updated: 2025-10-19
Ref: https://rdap.arin.net/registry/autnum/36557
OrgName: Ramius Capital Group, L.L.C.
OrgId: RCGL-2
Address: 599 Lexington Avenue
Address: 19th Floor
City: New York
StateProv: NY
PostalCode: 10022
Country: US
RegDate: 2006-01-03
Updated: 2017-05-10
Ref: https://rdap.arin.net/registry/entity/RCGL-2
OrgAbuseHandle: SMH15-ARIN
OrgAbuseName: Hanley, Steven Michael
OrgAbusePhone: +1-212-845-7973
OrgAbuseEmail: steven.hanley@cowen.com
OrgAbuseRef: https://rdap.arin.net/registry/entity/SMH15-ARIN
OrgTechHandle: SMH15-ARIN
OrgTechName: Hanley, Steven Michael
OrgTechPhone: +1-212-845-7973
OrgTechEmail: steven.hanley@cowen.com
OrgTechRef: https://rdap.arin.net/registry/entity/SMH15-ARIN
RAbuseHandle: YEUNG5-ARIN
RAbuseName: Yeung, Dave
RAbusePhone: +1-646-562-1800
RAbuseEmail: noc@cowen.com
RAbuseRef: https://rdap.arin.net/registry/entity/YEUNG5-ARIN
RNOCHandle: ABA20-ARIN
RNOCName: Bankouski, Andrei
RNOCPhone: +1-646-562-1800
RNOCEmail: tdc-network@tdsecurities.com
RNOCRef: https://rdap.arin.net/registry/entity/ABA20-ARIN
RTechHandle: ABA20-ARIN
RTechName: Bankouski, Andrei
RTechPhone: +1-646-562-1800
RTechEmail: tdc-network@tdsecurities.com
RTechRef: https://rdap.arin.net/registry/entity/ABA20-ARIN
RTechHandle: YEUNG5-ARIN
RTechName: Yeung, Dave
RTechPhone: +1-646-562-1800
RTechEmail: noc@cowen.com
RTechRef: https://rdap.arin.net/registry/entity/YEUNG5-ARIN
RNOCHandle: YEUNG5-ARIN
RNOCName: Yeung, Dave
RNOCPhone: +1-646-562-1800
RNOCEmail: noc@cowen.com
RNOCRef: https://rdap.arin.net/registry/entity/YEUNG5-ARIN
RAbuseHandle: ABA20-ARIN
RAbuseName: Bankouski, Andrei
RAbusePhone: +1-646-562-1800
RAbuseEmail: tdc-network@tdsecurities.com
RAbuseRef: https://rdap.arin.net/registry/entity/ABA20-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.
#