AS42427 - MIMECAST-UK - Mimecast Services Limited, GB

United Kingdom
AS Number
AS42427
AS Name
MIMECAST-UK
Org Name
Mimecast Services Limited
Country / Region
United Kingdom
Registry

ripe

RegDate

Updated

2026-06-23T05:12:23Z

AS42427 Looking Glass
IPv4Prefixes

15

IPv6Prefixes

2

IPv4 NUMs

3,840

IPv6 NUMs(/64)

131,072

CIDR Description IP Num
41.74.203.0/24
IRR Valid
MIMECAST-ANYCAST Mimecast 256
91.220.42.0/24
IRR Valid
Mimecast Services Limited 256
170.10.142.0/24
IRR Valid
Mimecast North America Inc 256
185.58.84.0/24
IRR Valid
Mimecast Services Limited 256
185.58.85.0/24
IRR Valid
Mimecast Services Limited 256
185.58.86.0/24
IRR Valid
Mimecast Services Limited 256
185.58.87.0/24
IRR Valid
Mimecast Services Limited 256
193.7.204.0/24
IRR Valid
Mimecast Services Limited 256
193.7.205.0/24
IRR Valid
Mimecast Services Limited 256
195.130.217.0/24
IRR Valid
Mimecast Services Limited 256
207.82.80.0/24
IRR Valid
CenturyLink Communications, LLC 256
216.35.243.0/24
IRR Valid
CenturyLink Communications, LLC 256
216.35.244.0/24
IRR Valid
CenturyLink Communications, LLC 256
216.145.218.0/24
IRR Valid
Mimecast North America Inc 256
216.145.222.0/24
IRR Valid
Mimecast North America Inc 256
CIDR Description IP NUMs(prefix /64)
2a02:5be0::/48
IRR Valid
Mimecast Services Limited 65536
2a02:5be0:1::/48
IRR Valid
Mimecast Services Limited 65536
AS Description Country / Region IPv4 NUMs IPv6 NUMs IPv4 IPv6
AS3356 LEVEL3 - Level 3 Parent, LLC, US United States 28,864,512 81,626,398,720 IPv4 IPv4 IPv6 IPv6
AS6461 ZAYO-6461 - Zayo Bandwidth, US United States 1,751,552 51,808,436,224 IPv4 IPv4 IPv6 IPv6
AS2914 NTT-DATA-2914 - NTT America, Inc., US United States 6,499,584 30,065,033,216 IPv4 IPv4 IPv6 IPv6

Whois Record

as-block AS42383 - AS42953

as-block
descr
RIPE NCC ASN block
remarks
These AS Numbers are assigned to network operators in the RIPE NCC service region.
mnt-by
RIPE-NCC-HM-MNT
created
2026-06-23T05:12:23Z
last-modified
2026-06-23T05:12:23Z
source
RIPE

aut-num AS42427

aut-num
as-name
MIMECAST-UK
org
ORG-MSL21-RIPE
import
from AS2914 accept ANY
from AS1290 accept ANY
from AS3910 accept ANY
export
to AS2914 announce AS42427
to AS1290 announce AS42427
to AS3910 announce AS42427
admin-c
CGRD-RIPE
tech-c
CGRD-RIPE
status
ASSIGNED
mnt-by
RIPE-NCC-END-MNT
MCSL-RIPE-MNT
created
2017-05-05T13:56:06Z
last-modified
2019-07-08T07:23:24Z
source
RIPE

organisation ORG-MSL21-RIPE

organisation
ORG-MSL21-RIPE
org-name
Mimecast Services Limited
country
GB
reg-nr
04901524
org-type
LIR
address
1 Finsbury Avenue
EC2M 2PF
London
UNITED KINGDOM
phone
+442078478700
e-mail
netops@mimecast.com
mnt-ref
RIPE-NCC-HM-MNT
MCSL-RIPE-MNT
mnt-by
RIPE-NCC-HM-MNT
MCSL-RIPE-MNT
abuse-c
CGRD-RIPE
created
2014-05-05T13:57:11Z
last-modified
2026-05-13T07:04:23Z
source
RIPE
admin-c
CGRD-RIPE

role Mimecast - CoreGrid

role
Mimecast - CoreGrid
address
1 Finsbury Avenue
London
EC2M 2PF
United Kingdom
phone
+44 (0)207 847 8700
admin-c
MCNO2003-RIPE
tech-c
MCNO2003-RIPE
e-mail
netops@mimecast.com
remarks
---------------------------------
---------------------------------
abuse-mailbox
abuse@mimecast.com
nic-hdl
CGRD-RIPE
mnt-by
MCSL-RIPE-MNT
created
2014-05-20T16:18:44Z
last-modified
2023-09-28T13:31:26Z
source
RIPE
 

as-block:       AS42383 - AS42953
descr:          RIPE NCC ASN block
remarks:        These AS Numbers are assigned to network operators in the RIPE NCC service region.
mnt-by:         RIPE-NCC-HM-MNT
created:        2026-06-23T05:12:23Z
last-modified:  2026-06-23T05:12:23Z
source:         RIPE



aut-num:        AS42427
as-name:        MIMECAST-UK
org:            ORG-MSL21-RIPE
import:         from AS2914 accept ANY
export:         to AS2914 announce AS42427
import:         from AS1290 accept ANY
export:         to AS1290 announce AS42427
import:         from AS3910 accept ANY
export:         to AS3910 announce AS42427
admin-c:        CGRD-RIPE
tech-c:         CGRD-RIPE
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         MCSL-RIPE-MNT
created:        2017-05-05T13:56:06Z
last-modified:  2019-07-08T07:23:24Z
source:         RIPE

organisation:   ORG-MSL21-RIPE
org-name:       Mimecast Services Limited
country:        GB
reg-nr:         04901524
org-type:       LIR
address:        1 Finsbury Avenue
address:        EC2M 2PF
address:        London
address:        UNITED KINGDOM
phone:          +442078478700
e-mail:         netops@mimecast.com
mnt-ref:        RIPE-NCC-HM-MNT
mnt-ref:        MCSL-RIPE-MNT
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         MCSL-RIPE-MNT
abuse-c:        CGRD-RIPE
created:        2014-05-05T13:57:11Z
last-modified:  2026-05-13T07:04:23Z
source:         RIPE
admin-c:        CGRD-RIPE

role:           Mimecast - CoreGrid
address:        1 Finsbury Avenue
address:        London
address:        EC2M 2PF
address:        United Kingdom
phone:          +44 (0)207 847 8700
admin-c:        MCNO2003-RIPE
tech-c:         MCNO2003-RIPE
e-mail:         netops@mimecast.com
remarks:        ---------------------------------
abuse-mailbox:  abuse@mimecast.com
remarks:        ---------------------------------
nic-hdl:        CGRD-RIPE
mnt-by:         MCSL-RIPE-MNT
created:        2014-05-20T16:18:44Z
last-modified:  2023-09-28T13:31:26Z
source:         RIPE