asn.dev

Autonomous system

AS60492 MIMECAST-JE

Unclassified RIPE

IPv4 addresses 1.28K 4 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly GB
Exchanges 0 recorded by PCH
Upstreams 1 0 downstream
Flagged prefixes 0 none

Summary

Mimecast

United Kingdom · AI-generated

security email business

MIMECAST-JE is operated by Mimecast Services Limited.

What it's used for

  • The address space carries Mimecast's email security infrastructure, evidenced by netnames UK-MIMECAST1-20181018, MNA-95, and Mimecast, and reverse DNS entries pointing to je-smtp-delivery-24.mimecast-offshore.com.
  • The AS announces 1280 IPv4 addresses across 4 prefixes with only 1 observed neighbour, indicating a dedicated endpoint network for service delivery rather than transit or residential access.
  • Traffic from this AS consists of SMTP delivery and email security processing for Mimecast's enterprise clients, supporting its business in email security and risk management.

Notable

  • Registrants align with the announcer, including Mimecast - CoreGrid, Mimecast Services Limited, and Mimecast North America Inc.
  • The inventory consists of four distinct IPv4 prefixes, including a /23 block and three /24 blocks, all located in the United Kingdom.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.

Interconnection

Peering at a glance

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

1 upstream, 0 downstream and 1 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS8680Sure (Guernsey) Limited294

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-16, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 4 prefixes · 1.28K addresses IPv6 0 prefixes

CountryNamePrefixes
GBUnited Kingdom4

Registry

Allocation record

RIPE · via Atlas (registry + RDAP)
Registry
RIPE
Handle
AS60492
Registry name
MIMECAST-JE
Registrant
MCSL-RIPE-MNT
Abuse contact
abuse@mimecast.com
Registered
2019-05-14
Last changed
2019-05-14
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 5 valid, 0 with no ROA
ROAs
10 authorising AS60492
ASPA
no ASPA record
IRR
100% registered · 5 of 5 announcements
Route objects
10 naming AS60492

Reputation

Classification and threat

Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.

Spamhaus DROP

Not on ASN-DROP The network as a whole is not listed.

No DROP prefixes None of its announced space is on the DROP prefix list.

Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 442 networks and 1,783 prefixes, as published 2026-10-17. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.

FBI IC3

No IC3 indicators Nothing from the FBI IC3 feed.

IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.

Elsewhere

Cross-check