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 AS16603 as originally allocated by
/usr/bin/whois -h jwhois.apnic.netr "AS16603\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: 16603
ASName: HOSTDRIVE
ASHandle: AS16603
RegDate: 2000-05-25
Updated: 2017-09-06
Ref: https://rdap.arin.net/registry/autnum/16603
OrgName: HostDrive.Com
OrgId: KPL-56
Address: P.O. Box 122
City: Milton
StateProv: WI
PostalCode: 53563
Country: US
RegDate: 2017-08-17
Updated: 2025-07-01
Comment: http://www.hostdrive.com
Ref: https://rdap.arin.net/registry/entity/KPL-56
ReferralServer: rwhois://rwhois.mia.net:4321
OrgNOCHandle: JK552-ARIN
OrgNOCName: Kinsey, Jeremy
OrgNOCPhone: +1-262-248-6759
OrgNOCEmail: jer@mia.net
OrgNOCRef: https://rdap.arin.net/registry/entity/JK552-ARIN
OrgTechHandle: JK552-ARIN
OrgTechName: Kinsey, Jeremy
OrgTechPhone: +1-262-248-6759
OrgTechEmail: jer@mia.net
OrgTechRef: https://rdap.arin.net/registry/entity/JK552-ARIN
OrgAbuseHandle: JK552-ARIN
OrgAbuseName: Kinsey, Jeremy
OrgAbusePhone: +1-262-248-6759
OrgAbuseEmail: jer@mia.net
OrgAbuseRef: https://rdap.arin.net/registry/entity/JK552-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.
#
Found a referral to rwhois.mia.net:4321.
%rwhois V-1.5:003fff:00 rwhois.mia.net (by Network Solutions, Inc. V-1.5.9.6)
%error 230 No Objects Found