MIMECAST SERVICES LIMITED
Mimecast Services Limited
GLEIF verified
LEI
213800ZRSRSAJVIZEX39
Registered name
MIMECAST SERVICES LIMITED
Jurisdiction
Ultimate parent
No parent on file in GLEIF
Cluster stats
| Netblocks | 68 · 19,217 IPv4 addresses |
| Registered in | United Kingdom (41) · United States (9) · Germany (2) · JE (2) |
| Cluster ID | 213449946 |
| Registry | BGP |
| Owner jurisdiction | GB |
| Customers | find customers using this network → |
Evidence & provenance ?
| Attribution | GLEIF legal-entity match |
| Legal identity | LEI 213800ZRSRSAJVIZEX39 |
| Shared handles | clustered on 33 shared RIR contact/maintainer handles |
| Registry names | 10 distinct registrant names across these blocks |
| full provenance (JSON) → · how attribution works | |
Footprint over time
6 weekly snapshots · JSON
68
-9 netblocks since 2026-07-05
2026-07-05
peak 77
2026-07-26
IP Ranges (68)
showing 50 of 68 — see all — ⬇ export CSV| CIDR | Org name | Registry | Status | Confidence |
|---|---|---|---|---|
| 45.91.16.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 45.91.17.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 51.163.158.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 51.163.159.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 62.140.7.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 62.140.10.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 91.220.42.0/24 | Mimecast Services Limited | RIPE | ASSIGNED PI | ● high |
| 91.220.42.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 147.28.34.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 147.28.35.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 170.10.141.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 170.10.142.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 185.58.84.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 185.58.84.0/24 | Mimecast Services Limited | RIPE | ASSIGNED PA | ● high |
| 185.58.85.0/24 | Mimecast Services Limited | RIPE | ASSIGNED PA | ● high |
| 185.58.85.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 185.58.86.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 185.58.86.0/24 | Mimecast Services Limited | RIPE | ASSIGNED PA | ● high |
| 185.58.87.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 185.58.87.0/24 | Mimecast Services Limited | RIPE | ASSIGNED PA | ● high |
| 193.7.204.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 193.7.204.0/24 | Mimecast Services Limited | RIPE | ASSIGNED PA | ● high |
| 193.7.205.0/24 | Mimecast Services Limited | RIPE | ASSIGNED PA | ● high |
| 193.7.205.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 193.7.206.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 193.7.207.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 194.104.108.0/23 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 194.104.110.0/23 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 195.130.217.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 195.130.217.0/24 | Mimecast Services Limited | RIPE | ASSIGNED PI | ● high |
| 207.82.80.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 207.211.30.0/24 | Mimecast Services Limited | ARIN | ASSIGNMENT | ● high |
| 213.167.75.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 213.167.81.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 216.35.243.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 216.35.244.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 216.145.218.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 216.145.222.0/24 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 216.205.24.0/24 | Mimecast Services Limited | ARIN | ASSIGNMENT | ● high |
| 2001:67c:2790::/48 | Mimecast Services Ltd | RIPE | ASSIGNED PI | ● high |
| 2a02:5be0::/48 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 2a02:5be0::/48 | Mimecast Services Limited | RIPE | ASSIGNED | ● high |
| 2a02:5be0:1::/48 | Mimecast Services Limited | RIPE | ASSIGNED | ● high |
| 2a02:5be0:1::/48 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 2a02:5be0:2::/48 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 2a02:5be0:3::/48 | Mimecast Services Limited | BGP | ANNOUNCED | ● high |
| 45.91.16.0/22 | Mimecast Services Limited | RIPE | ALLOCATED PA | ● low |
| 45.91.16.0/24 | Mimecast Services Limited | RIPE | LIR-PARTITIONED PA | ● low |
| 45.91.19.0/24 | mimecast-it-jhb | RIPE | LIR-PARTITIONED PA | ● low |
| 45.91.19.11/32 | mimecast-it-cpt | RIPE | ASSIGNED PA | ● low |
Domains hosted in this network
what's this?Network trust
what's this?
RPKI hygiene: C
how networks compare →
75.0%
of checked blocks have valid RPKI ROA coverage
(51 of 68)
Possible discrepancies (3)
These blocks are registered to Mimecast Services Limited but cryptographically authorized for a different, unrelated network (2 distinct holders) — often M&A history, multi-homing, or outsourced/managed hosting, occasionally worth a closer look.
| 2a00:2381:ffc7::/48 /48 | authorized for AS2856 — British Telecommunications Limited |
| 2a02:5be0:9::/48 /48 | authorized for AS14618 — Amazon.com, Inc. |
| 2a00:2381:ffc7::/56 /56 | authorized for AS2856 — British Telecommunications Limited |
NIC Handles
ABOVENET-MNT
AS208638
AS39588
AS42427
AS60492
BTNET-MNT
CGRD-RIPE
DAVIS2734-ARIN
DAVIS2734-ARIN
DUMY-RIPE
DUMY-RIPE
EQUINIX-MNT
+21 more