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	Prefix	Description
	41.74.203.0/24	Mimecast
	63.128.21.0/24	CenturyLink Communications, LLC
	170.10.128.0/23	Mimecast North America Inc
	170.10.130.0/24	Mimecast North America Inc
	170.10.131.0/24	Mimecast North America Inc
	170.10.132.0/23	Mimecast North America Inc
	170.10.140.0/24	Mimecast North America Inc
	170.10.142.0/24	Mimecast North America Inc
	170.10.150.0/24	Mimecast North America Inc
	170.10.151.0/24	Mimecast North America Inc
	170.10.152.0/24	Mimecast North America Inc
	170.10.153.0/24	Mimecast North America Inc
	170.10.156.0/24	Mimecast North America Inc
	170.10.157.0/24	Mimecast North America Inc
	205.139.110.0/24	CenturyLink Communications, LLC
	205.139.111.0/24	CenturyLink Communications, LLC
	207.211.30.0/24	Mimecast Services Limited
	216.145.218.0/24	Mimecast North America Inc
	216.145.219.0/24	Mimecast North America Inc
	216.145.222.0/24	Mimecast North America Inc
	216.205.24.0/24	Mimecast Services Limited
	2620:134:6000::/48	Mimecast North America Inc
	2620:134:6001::/48	Mimecast North America Inc
	2620:134:6002::/48	Mimecast North America Inc
	2620:134:6008::/48	Mimecast North America Inc
	2620:134:6009::/48	Mimecast North America Inc

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Network Policy

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How are upstreams and downstreams calculated?

Upstreams

	ASN	Description	IPv4	IPv6
	AS3356	Lumen (Level 3)	✔	✔
	AS6461	Zayo Bandwidth	✔	✔
	AS2914	NTT America, Inc.	✔	✔
	AS12213	Centersquare	✔	✘

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Peers

	ASN	Description	IPv4	IPv6
	AS6461	Zayo Bandwidth	✔	✔
	AS3356	Lumen (Level 3)	✔	✔
	AS2914	NTT America, Inc.	✔	✔
	AS12213	Centersquare	✔	✘

ASHandle:       AS30031
OrgID:          MNA-95
ASName:         MIMECAST-US
ASNumber:       30031
RegDate:        2017-07-07
Updated:        2017-07-07
Source:         ARIN



OrgID:          MNA-95
OrgName:        Mimecast North America Inc
CanAllocate:    
Street:         191 Spring St
City:           Lexington
State/Prov:     MA
Country:        US
PostalCode:     02421
RegDate:        2017-06-29
Updated:        2025-05-07
OrgAdminHandle: DAVIS2734-ARIN
OrgTechHandle:  DAVIS2734-ARIN
OrgTechHandle:  MIMEC-ARIN
OrgTechHandle:  SEVCI-ARIN
OrgAbuseHandle: MIMEC1-ARIN
OrgNOCHandle:   MIMEC-ARIN
Source:         ARIN





OrgAdminHandle:       DAVIS2734-ARIN
OrgAdminName:         Brian Davis
# Email removed, Log into bgp.tools to see whois emails


OrgTechHandle:        DAVIS2734-ARIN
OrgTechName:          Brian Davis
# Email removed, Log into bgp.tools to see whois emails


OrgTechHandle:        MIMEC-ARIN
OrgTechName:           Mimecast
# Email removed, Log into bgp.tools to see whois emails


OrgTechHandle:        SEVCI-ARIN
OrgTechName:          Libor Sevcik
# Email removed, Log into bgp.tools to see whois emails


OrgAbuseHandle:       MIMEC1-ARIN
OrgAbuseName:          MIMEC-ABUSE
# Email removed, Log into bgp.tools to see whois emails


OrgNOCHandle:         MIMEC-ARIN
OrgNOCName:            Mimecast
# Email removed, Log into bgp.tools to see whois emails

Last Update: 2026-03-13T03:26:07Z UTC

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Member of the following AS-SETs

-	Member	ASN Count
NTTCOM	as2914:as-us	72773
NTTCOM	as2914:as-us-v6	72351
RIPE	as-mfnx	74565
RADB	as-navisite-ma	13
LEVEL3	as-lumen-customers-asns	10695