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.
AS21542 1 More Specifics 1 Total Advertisements ENERGYSERVICESGROUP, US
208.253.5.0/24 208.192.0.0/10
whois: 402590
IANA has recorded AS21542 as originally allocated by
/usr/bin/whois -h jwhois.apnic.netr "AS21542\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: 21542
ASName: ENERGYSERVICESGROUP
ASHandle: AS21542
RegDate: 2001-05-18
Updated: 2012-03-02
Ref: https://rdap.arin.net/registry/autnum/21542
OrgName: Energy Services Group
OrgId: ESG-14
Address: 141 Longwater Drive
Address: Suite 113
City: Norwell
StateProv: MA
PostalCode: 02061
Country: US
RegDate: 2001-05-18
Updated: 2015-11-19
Ref: https://rdap.arin.net/registry/entity/ESG-14
OrgNOCHandle: PGU14-ARIN
OrgNOCName: Gurule, Phil
OrgNOCPhone: +1-617-909-1680
OrgNOCEmail: pgurule@energyservicesgroup.net
OrgNOCRef: https://rdap.arin.net/registry/entity/PGU14-ARIN
OrgTechHandle: PGU14-ARIN
OrgTechName: Gurule, Phil
OrgTechPhone: +1-617-909-1680
OrgTechEmail: pgurule@energyservicesgroup.net
OrgTechRef: https://rdap.arin.net/registry/entity/PGU14-ARIN
OrgAbuseHandle: PGU14-ARIN
OrgAbuseName: Gurule, Phil
OrgAbusePhone: +1-617-909-1680
OrgAbuseEmail: pgurule@energyservicesgroup.net
OrgAbuseRef: https://rdap.arin.net/registry/entity/PGU14-ARIN
RTechHandle: LC505-ARIN
RTechName: CANNON, LYNN
RTechPhone: +1-781-347-9000
RTechEmail: LCANNON@energyservicesgroup.net
RTechRef: https://rdap.arin.net/registry/entity/LC505-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.
#