AS Number
AS21369
AS Name
SEMA-UK-AS
Org Name
Atos IT Services UK Ltd
Country / Region
United Kingdom
Registry

ripe

RegDate

Updated

2018-11-22T15:27:28Z

AS21369 Looking Glass
IPv4Prefixes

46

IPv6Prefixes

0

IPv4 NUMs

8,704

IPv6 NUMs(/64)

0

CIDR Description IP Num
157.203.6.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.6.0/23
IRR InValid
Atos IT Services UK Ltd 512
157.203.7.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.36.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.36.0/23
IRR InValid
Atos IT Services UK Ltd 512
157.203.37.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.40.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.40.0/23
IRR InValid
Atos IT Services UK Ltd 512
157.203.41.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.42.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.42.0/23
IRR InValid
Atos IT Services UK Ltd 512
157.203.43.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.48.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.48.0/23
IRR InValid
Atos IT Services UK Ltd 512
157.203.49.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.52.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.52.0/23
IRR InValid
Atos IT Services UK Ltd 512
157.203.53.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.56.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.56.0/23
IRR InValid
Atos IT Services UK Ltd 512
157.203.57.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.58.0/23
IRR InValid
Atos IT Services UK Ltd 512
157.203.59.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.60.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.60.0/23
IRR InValid
Atos IT Services UK Ltd 512
157.203.61.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.62.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.62.0/23
IRR InValid
Atos IT Services UK Ltd 512
157.203.92.0/23
IRR InValid
Atos IT Services UK Ltd 512
157.203.120.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.120.0/23
IRR InValid
Atos IT Services UK Ltd 512
157.203.176.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.176.0/23
IRR InValid
Atos IT Services UK Ltd 512
157.203.177.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.178.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.178.0/23
IRR InValid
Atos IT Services UK Ltd 512
157.203.179.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.180.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.180.0/23
IRR InValid
Atos IT Services UK Ltd 512
157.203.181.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.242.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.242.0/23
IRR InValid
Atos IT Services UK Ltd 512
157.203.243.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.254.0/24
IRR Valid
Atos IT Services UK Ltd 256
157.203.254.0/23
IRR InValid
Atos IT Services UK Ltd 512
157.203.255.0/24
IRR Valid
Atos IT Services UK Ltd 256
AS Description Country / Region IPv4 NUMs IPv6 NUMs IPv4 IPv6
AS702 UUNET - Verizon Business, US United States 5,775,360 652,835,225,600 IPv4 IPv4
AS2856 BT-UK-AS - British Telecommunications Limited, GB United Kingdom 13,910,272 584,115,814,400 IPv4 IPv4
AS8220 COLT - COLT Technology Services Group Limited, GB United Kingdom 1,497,088 25,770,590,208 IPv4 IPv4
AS198949 Radware - Radware Ltd, IL Israel 116,480 17,448,894,464 IPv4 IPv4

Whois Record

as-block AS21281 - AS21390

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
2018-11-22T15:27:28Z
last-modified
2018-11-22T15:27:28Z
source
RIPE

aut-num AS21369

aut-num
as-name
SEMA-UK-AS
org
ORG-AISU1-RIPE
remarks
Will advertise network 192.12.43.0/24
------------------------------------------------------
*
Verizon Peering
*
------------------------------------------------------
------------------------------------------------------
*
Level3 Peering
*
------------------------------------------------------
------------------------------------------------------
*
Zayo Peering
*
------------------------------------------------------
------------------------------------------------------
*
ConvergenceGroup Peering
*
------------------------------------------------------
------------------------------------------------------
*
BGP Off-ramping Peering
*
------------------------------------------------------
------------------------------------------------------
*
Legacy peerings for review
*
------------------------------------------------------
------------------------------------------------------
*
Last modified by Shared Services 03-01-2023
import
from AS702 action pref=100; accept ANY
from AS3356 action pref=100; accept ANY
from AS3549 action pref=100; accept ANY
from AS6461 action pref=100; accept ANY
from AS41811 action pref=100; accept ANY
from AS198949 action pref=100; accept ANY
from AS8918 action pref=100; accept ANY
from AS2856 action pref=100; accept ANY
export
to AS702 announce AS21369
to AS3356 announce AS21369
to AS3549 announce AS21369
to AS6461 announce AS21369
to AS41811 announce AS21369
to AS198949 announce AS21369
to AS8918 announce AS21369
default
to AS2856 action pref=100; networks ANY
admin-c
ATOS5-RIPE
tech-c
ATOS5-RIPE
status
ASSIGNED
mnt-by
RIPE-NCC-END-MNT
SEMA-UK-AS-MNT
created
2001-11-15T09:27:21Z
last-modified
2023-01-03T10:00:37Z
source
RIPE

organisation ORG-AISU1-RIPE

organisation
ORG-AISU1-RIPE
org-name
Atos IT Services UK Ltd
country
GB
reg-nr
1245534
org-type
LIR
address
Sixth Floor, Midcity Place, 71 High Holborn
WC1V 6EA
London
UNITED KINGDOM
phone
+448007833040
fax-no
+441616018842
e-mail
uk.abuse@atos.net
admin-c
ATOS5-RIPE
tech-c
ATOS5-RIPE
abuse-c
AA30342-RIPE
mnt-by
SEMA-UK-AS-MNT
RIPE-NCC-HM-MNT
mnt-ref
SEMA-UK-AS-MNT
RIPE-NCC-HM-MNT
created
2013-05-30T09:12:57Z
last-modified
2026-06-24T10:44:00Z
source
RIPE

role ATOS Admin

role
ATOS Admin
address
3300 Solihull Parkway
Birmingham Business Park
B37 7YQ
e-mail
UK.Abuse@atos.net
abuse-mailbox
UK.Abuse@atos.net
nic-hdl
ATOS5-RIPE
mnt-by
SEMA-UK-AS-MNT
created
2013-10-05T00:51:50Z
last-modified
2013-10-05T03:40:17Z
source
RIPE

as-block:       AS21281 - AS21390
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:        2018-11-22T15:27:28Z
last-modified:  2018-11-22T15:27:28Z
source:         RIPE



aut-num:        AS21369
as-name:        SEMA-UK-AS
org:            ORG-AISU1-RIPE
remarks:        Will advertise network 192.12.43.0/24
remarks:        ------------------------------------------------------
remarks:        *
remarks:        Verizon Peering
remarks:        *
remarks:        ------------------------------------------------------
import:         from AS702 action pref=100; accept ANY
export:         to AS702 announce AS21369
remarks:        ------------------------------------------------------
remarks:        *
remarks:        Level3 Peering
remarks:        *
remarks:        ------------------------------------------------------
import:         from AS3356 action pref=100; accept ANY
import:         from AS3549 action pref=100; accept ANY
export:         to AS3356 announce AS21369
export:         to AS3549 announce AS21369
remarks:        ------------------------------------------------------
remarks:        *
remarks:        Zayo Peering
remarks:        *
remarks:        ------------------------------------------------------
import:         from AS6461 action pref=100; accept ANY
export:         to AS6461 announce AS21369
remarks:        ------------------------------------------------------
remarks:        *
remarks:        ConvergenceGroup Peering
remarks:        *
remarks:        ------------------------------------------------------
import:         from AS41811 action pref=100; accept ANY
export:         to AS41811 announce AS21369
remarks:        ------------------------------------------------------
remarks:        *
remarks:        BGP Off-ramping Peering
remarks:        *
remarks:        ------------------------------------------------------
import:         from AS198949 action pref=100; accept ANY
export:         to AS198949 announce AS21369
remarks:        ------------------------------------------------------
remarks:        *
remarks:        Legacy peerings for review
remarks:        *
remarks:        ------------------------------------------------------
export:         to AS8918 announce AS21369
import:         from AS8918 action pref=100; accept ANY
import:         from AS2856 action pref=100; accept ANY
default:        to AS2856 action pref=100; networks ANY
remarks:        ------------------------------------------------------
remarks:        *
remarks:        Last modified by Shared Services 03-01-2023
admin-c:        ATOS5-RIPE
tech-c:         ATOS5-RIPE
status:         ASSIGNED
mnt-by:         RIPE-NCC-END-MNT
mnt-by:         SEMA-UK-AS-MNT
created:        2001-11-15T09:27:21Z
last-modified:  2023-01-03T10:00:37Z
source:         RIPE

organisation:   ORG-AISU1-RIPE
org-name:       Atos IT Services UK Ltd
country:        GB
reg-nr:         1245534
org-type:       LIR
address:        Sixth Floor, Midcity Place, 71 High Holborn
address:        WC1V 6EA
address:        London
address:        UNITED KINGDOM
phone:          +448007833040
fax-no:         +441616018842
e-mail:         uk.abuse@atos.net
admin-c:        ATOS5-RIPE
tech-c:         ATOS5-RIPE
abuse-c:        AA30342-RIPE
mnt-by:         SEMA-UK-AS-MNT
mnt-ref:        SEMA-UK-AS-MNT
mnt-ref:        RIPE-NCC-HM-MNT
mnt-by:         RIPE-NCC-HM-MNT
created:        2013-05-30T09:12:57Z
last-modified:  2026-06-24T10:44:00Z
source:         RIPE

role:           ATOS Admin
address:        3300 Solihull Parkway
address:        Birmingham Business Park
address:        B37 7YQ
e-mail:         UK.Abuse@atos.net
abuse-mailbox:  UK.Abuse@atos.net
nic-hdl:        ATOS5-RIPE
mnt-by:         SEMA-UK-AS-MNT
created:        2013-10-05T00:51:50Z
last-modified:  2013-10-05T03:40:17Z
source:         RIPE