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.
AS397726 18 More Specifics 18 Total Advertisements MIMECAST-US-PSC, US
170.10.136.0/23 170.10.128.0/19
170.10.138.0/23 170.10.128.0/19
170.10.140.0/24 170.10.128.0/19
170.10.158.0/23 170.10.128.0/19
216.145.208.0/23 216.145.208.0/20
216.145.208.0/24 216.145.208.0/20
216.145.209.0/24 216.145.208.0/20
216.145.210.0/23 216.145.208.0/20
216.145.210.0/24 216.145.208.0/20
216.145.211.0/24 216.145.208.0/20
216.145.212.0/23 216.145.208.0/20
216.145.212.0/24 216.145.208.0/20
216.145.213.0/24 216.145.208.0/20
216.145.214.0/23 216.145.208.0/20
216.145.214.0/24 216.145.208.0/20
216.145.215.0/24 216.145.208.0/20
216.145.220.0/24 216.145.208.0/20
216.145.223.0/24 216.145.208.0/20
whois: 402590
IANA has recorded AS397726 as originally allocated by
/usr/bin/whois -h jwhois.apnic.netr "AS397726\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: 397726
ASName: MIMECAST-US-PSC
ASHandle: AS397726
RegDate: 2019-07-12
Updated: 2019-07-12
Ref: https://rdap.arin.net/registry/autnum/397726
OrgName: Mimecast North America Inc
OrgId: MNA-95
Address: 191 Spring St
City: Lexington
StateProv: MA
PostalCode: 02421
Country: US
RegDate: 2017-06-29
Updated: 2025-05-07
Ref: https://rdap.arin.net/registry/entity/MNA-95
OrgNOCHandle: MIMEC-ARIN
OrgNOCName: Mimecast
OrgNOCPhone: +442078478700
OrgNOCEmail: cloudnetworking@mimecast.com
OrgNOCRef: https://rdap.arin.net/registry/entity/MIMEC-ARIN
OrgTechHandle: MIMEC-ARIN
OrgTechName: Mimecast
OrgTechPhone: +442078478700
OrgTechEmail: cloudnetworking@mimecast.com
OrgTechRef: https://rdap.arin.net/registry/entity/MIMEC-ARIN
OrgAbuseHandle: MIMEC1-ARIN
OrgAbuseName: MIMEC-ABUSE
OrgAbusePhone: +1-617-393-7050
OrgAbuseEmail: abuse@mimecast.com
OrgAbuseRef: https://rdap.arin.net/registry/entity/MIMEC1-ARIN
OrgTechHandle: SEVCI-ARIN
OrgTechName: Sevcik, Libor
OrgTechPhone: +1-781-795-5393
OrgTechEmail: lsevcik@mimecast.com
OrgTechRef: https://rdap.arin.net/registry/entity/SEVCI-ARIN
OrgTechHandle: DAVIS2734-ARIN
OrgTechName: Davis, Brian
OrgTechPhone: +1-781-996-5340
OrgTechEmail: bdavis@mimecast.com
OrgTechRef: https://rdap.arin.net/registry/entity/DAVIS2734-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.
#