This AS is not currently used to announce prefixes in the global routing table, nor is it used as a visible transit AS.
whois: 402332
IANA has recorded AS21900 as originally allocated by
/usr/bin/whois -h jwhois.apnic.netr "AS21900\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/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#
ASNumber: 21900
ASName: LBPC
ASHandle: AS21900
RegDate: 2001-07-10
Updated: 2012-02-24
Ref: https://rdap.arin.net/registry/autnum/21900
OrgName: LAW BULLETIN PUBLISHING COMPANY
OrgId: LBP-6
Address: 415 N STATE ST
City: CHICAGO
StateProv: IL
PostalCode: 60654
Country: US
RegDate: 2001-05-30
Updated: 2011-09-24
Ref: https://rdap.arin.net/registry/entity/LBP-6
OrgTechHandle: DR987-ARIN
OrgTechName: ROSS, DARRELL
OrgTechPhone: +1-312-644-7800
OrgTechEmail: DROSS@lawbulletinmedia.com
OrgTechRef: https://rdap.arin.net/registry/entity/DR987-ARIN
OrgAbuseHandle: DR987-ARIN
OrgAbuseName: ROSS, DARRELL
OrgAbusePhone: +1-312-644-7800
OrgAbuseEmail: DROSS@lawbulletinmedia.com
OrgAbuseRef: https://rdap.arin.net/registry/entity/DR987-ARIN
RTechHandle: DR987-ARIN
RTechName: ROSS, DARRELL
RTechPhone: +1-312-644-7800
RTechEmail: DROSS@lawbulletinmedia.com
RTechRef: https://rdap.arin.net/registry/entity/DR987-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.
#