This AS is not currently used to announce prefixes in the global routing table, nor is it used as a visible transit AS.
whois: 402603
IANA has recorded AS4208 as originally allocated by
/usr/bin/whois -h jwhois.apnic.netr "AS4208\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: 4208
ASName: THE-ISERV-COMPANY
ASHandle: AS4208
RegDate: 1995-01-05
Updated: 2002-09-24
Ref: https://rdap.arin.net/registry/autnum/4208
OrgName: The Iserv Company, LLC
OrgId: ISER
Address: 4695 44th ST SE
Address: Suite B-175
City: Grand Rapids
StateProv: MI
PostalCode: 49512
Country: US
RegDate: 1994-12-20
Updated: 2024-12-04
Ref: https://rdap.arin.net/registry/entity/ISER
ReferralServer: rwhois://rwhois.iserv.net:4321
OrgTechHandle: INE-ARIN
OrgTechName: Iserv Network Engineering
OrgTechPhone: +1-616-493-0550
OrgTechEmail: net-admin@iserv.net
OrgTechRef: https://rdap.arin.net/registry/entity/INE-ARIN
OrgAbuseHandle: INE-ARIN
OrgAbuseName: Iserv Network Engineering
OrgAbusePhone: +1-616-493-0550
OrgAbuseEmail: net-admin@iserv.net
OrgAbuseRef: https://rdap.arin.net/registry/entity/INE-ARIN
RTechHandle: INE-ARIN
RTechName: Iserv Network Engineering
RTechPhone: +1-616-493-0550
RTechEmail: net-admin@iserv.net
RTechRef: https://rdap.arin.net/registry/entity/INE-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.iserv.net:4321.