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 AS19977 as originally allocated by
/usr/bin/whois -h jwhois.apnic.netr "AS19977\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: 19977
ASName: MBRML-AS
ASHandle: AS19977
RegDate: 2016-08-02
Updated: 2016-08-02
Ref: https://rdap.arin.net/registry/autnum/19977
OrgName: Mayer Brown LLP
OrgId: MBRML
Address: 71 S. Wacker
City: Chicago
StateProv: IL
PostalCode: 60606
Country: US
RegDate: 2006-01-12
Updated: 2016-07-12
Ref: https://rdap.arin.net/registry/entity/MBRML
OrgTechHandle: MCS7-ARIN
OrgTechName: Sherman, Michael C
OrgTechPhone: +1-312-701-8315
OrgTechEmail: msherman@mayerbrown.com
OrgTechRef: https://rdap.arin.net/registry/entity/MCS7-ARIN
OrgAbuseHandle: MCS7-ARIN
OrgAbuseName: Sherman, Michael C
OrgAbusePhone: +1-312-701-8315
OrgAbuseEmail: msherman@mayerbrown.com
OrgAbuseRef: https://rdap.arin.net/registry/entity/MCS7-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.
#