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.
AS12151 1 More Specifics 1 Total Advertisements LEARNING-TREE-INTL-OPERATIONS, US
199.85.218.0/23 199.85.216.0/22
Prefixes added and withdrawn by this origin AS in the past 7 days.
+ 199.85.218.0/23 Announced
whois: 402590
IANA has recorded AS12151 as originally allocated by
/usr/bin/whois -h jwhois.apnic.netr "AS12151\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: 12151
ASName: LEARNING-TREE-INTL-OPERATIONS
ASHandle: AS12151
RegDate: 2006-11-01
Updated: 2016-12-20
Ref: https://rdap.arin.net/registry/autnum/12151
OrgName: Learning Tree International, Inc.
OrgId: LTI-34
Address: 13650 Dulles Technology Drive
Address: Suite 400
City: Herndon
StateProv: VA
PostalCode: 20171
Country: US
RegDate: 2002-10-24
Updated: 2021-10-22
Comment: http://www.learningtree.com
Ref: https://rdap.arin.net/registry/entity/LTI-34
OrgDNSHandle: ARINM9-ARIN
OrgDNSName: ARINMGR
OrgDNSPhone: +1-703-709-5944
OrgDNSEmail: isroot@learningtree.com
OrgDNSRef: https://rdap.arin.net/registry/entity/ARINM9-ARIN
OrgRoutingHandle: ARINM9-ARIN
OrgRoutingName: ARINMGR
OrgRoutingPhone: +1-703-709-5944
OrgRoutingEmail: isroot@learningtree.com
OrgRoutingRef: https://rdap.arin.net/registry/entity/ARINM9-ARIN
OrgNOCHandle: ARINM9-ARIN
OrgNOCName: ARINMGR
OrgNOCPhone: +1-703-709-5944
OrgNOCEmail: isroot@learningtree.com
OrgNOCRef: https://rdap.arin.net/registry/entity/ARINM9-ARIN
OrgAbuseHandle: ABUSE2163-ARIN
OrgAbuseName: Abuse
OrgAbusePhone: +1-703-709-9119
OrgAbuseEmail: abuse@learningtree.com
OrgAbuseRef: https://rdap.arin.net/registry/entity/ABUSE2163-ARIN
OrgTechHandle: ARINM9-ARIN
OrgTechName: ARINMGR
OrgTechPhone: +1-703-709-5944
OrgTechEmail: isroot@learningtree.com
OrgTechRef: https://rdap.arin.net/registry/entity/ARINM9-ARIN
RAbuseHandle: CWH33-ARIN
RAbuseName: Whitnel, Chuck
RAbusePhone: +1-703-925-5600
RAbuseEmail: chuck_whitnel@learningtree.com
RAbuseRef: https://rdap.arin.net/registry/entity/CWH33-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.
#