Organization
Atos IT Services UK Ltd
SEMA-UK-AS
Registered
Nov 15, 2001
24 years ago
IPv4 Prefixes
46
8,704 addresses
IPv6 Prefixes
0
BGP Neighbours
4
4 upstream/peer · 0 downstream
Registration
AS Number AS21369 AS Name SEMA-UK-AS Organization Atos IT Services UK Ltd Organization ID ORG-AISU1-RIPE Address Sixth Floor, Midcity Place, 71 High Holborn, WC1V 6EA, London, UNITED KINGDOM Country United Kingdom (GB) Registry RIPE NCC Allocated Nov 15, 2001 Record Created Nov 15, 2001 Last Updated Jan 03, 2023 Status
active
WHOIS Server whois.ripe.net AS Description SEMA-UK-AS - Atos IT Services UK Ltd, GB 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 Abuse Email [email protected] IPv4 Prefixes
46 prefixes · 8,704 addresses · 17 top-level Routing data as of 2026-10-05 00:00 UTC
157.0.0.0/8 · 46 prefixes · 8,704 addresses
| Prefix | Range | Addresses |
|---|---|---|
| 157.203.6.0/23 | 157.203.6.0 – 157.203.7.255 | 512 |
| 157.203.6.0/24 | 157.203.6.0 – 157.203.6.255 | 256 |
| 157.203.7.0/24 | 157.203.7.0 – 157.203.7.255 | 256 |
| 157.203.36.0/23 | 157.203.36.0 – 157.203.37.255 | 512 |
| 157.203.36.0/24 | 157.203.36.0 – 157.203.36.255 | 256 |
| 157.203.37.0/24 | 157.203.37.0 – 157.203.37.255 | 256 |
| 157.203.40.0/23 | 157.203.40.0 – 157.203.41.255 | 512 |
| 157.203.40.0/24 | 157.203.40.0 – 157.203.40.255 | 256 |
| 157.203.41.0/24 | 157.203.41.0 – 157.203.41.255 | 256 |
| 157.203.42.0/23 | 157.203.42.0 – 157.203.43.255 | 512 |
| 157.203.42.0/24 | 157.203.42.0 – 157.203.42.255 | 256 |
| 157.203.43.0/24 | 157.203.43.0 – 157.203.43.255 | 256 |
| 157.203.48.0/23 | 157.203.48.0 – 157.203.49.255 | 512 |
| 157.203.48.0/24 | 157.203.48.0 – 157.203.48.255 | 256 |
| 157.203.49.0/24 | 157.203.49.0 – 157.203.49.255 | 256 |
| 157.203.52.0/23 | 157.203.52.0 – 157.203.53.255 | 512 |
| 157.203.52.0/24 | 157.203.52.0 – 157.203.52.255 | 256 |
| 157.203.53.0/24 | 157.203.53.0 – 157.203.53.255 | 256 |
| 157.203.56.0/23 | 157.203.56.0 – 157.203.57.255 | 512 |
| 157.203.56.0/24 | 157.203.56.0 – 157.203.56.255 | 256 |
| 157.203.57.0/24 | 157.203.57.0 – 157.203.57.255 | 256 |
| 157.203.58.0/23 | 157.203.58.0 – 157.203.59.255 | 512 |
| 157.203.59.0/24 | 157.203.59.0 – 157.203.59.255 | 256 |
| 157.203.60.0/23 | 157.203.60.0 – 157.203.61.255 | 512 |
| 157.203.60.0/24 | 157.203.60.0 – 157.203.60.255 | 256 |
| 157.203.61.0/24 | 157.203.61.0 – 157.203.61.255 | 256 |
| 157.203.62.0/23 | 157.203.62.0 – 157.203.63.255 | 512 |
| 157.203.62.0/24 | 157.203.62.0 – 157.203.62.255 | 256 |
| 157.203.92.0/23 | 157.203.92.0 – 157.203.93.255 | 512 |
| 157.203.120.0/23 | 157.203.120.0 – 157.203.121.255 | 512 |
| 157.203.120.0/24 | 157.203.120.0 – 157.203.120.255 | 256 |
| 157.203.176.0/23 | 157.203.176.0 – 157.203.177.255 | 512 |
| 157.203.176.0/24 | 157.203.176.0 – 157.203.176.255 | 256 |
| 157.203.177.0/24 | 157.203.177.0 – 157.203.177.255 | 256 |
| 157.203.178.0/23 | 157.203.178.0 – 157.203.179.255 | 512 |
| 157.203.178.0/24 | 157.203.178.0 – 157.203.178.255 | 256 |
| 157.203.179.0/24 | 157.203.179.0 – 157.203.179.255 | 256 |
| 157.203.180.0/23 | 157.203.180.0 – 157.203.181.255 | 512 |
| 157.203.180.0/24 | 157.203.180.0 – 157.203.180.255 | 256 |
| 157.203.181.0/24 | 157.203.181.0 – 157.203.181.255 | 256 |
| 157.203.242.0/23 | 157.203.242.0 – 157.203.243.255 | 512 |
| 157.203.242.0/24 | 157.203.242.0 – 157.203.242.255 | 256 |
| 157.203.243.0/24 | 157.203.243.0 – 157.203.243.255 | 256 |
| 157.203.254.0/23 | 157.203.254.0 – 157.203.255.255 | 512 |
| 157.203.254.0/24 | 157.203.254.0 – 157.203.254.255 | 256 |
| 157.203.255.0/24 | 157.203.255.0 – 157.203.255.255 | 256 |
IPv6 Prefixes
This AS does not currently announce any IPv6 prefixes.
BGP Neighbours
4 unique neighbours · 4 upstream/peer · 0 downstream. A neighbour can be seen on more than one side. Rows are ordered by AS paths: the number of BGP paths seen by RIPE RIS that contain the adjacency. Sightings count each IPv4/IPv6 route with the adjacency once per RIS peer that sees it (routes × peers), so they show how widely it is seen, not how many distinct routes it carries. Networks seen to the left of this AS in BGP paths, toward the route collectors — typically its transit providers (upstreams) and peers. Upstream & peer side (4)
Raw RDAP Response
{
"handle": "AS21369",
"startAutnum": 21369,
"endAutnum": 21369,
"name": "SEMA-UK-AS",
"status": [
"active"
],
"entities": [
{
"handle": "ATOS5-RIPE",
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"ATOS Admin"
],
[
"kind",
{},
"text",
"group"
],
[
"adr",
{
"label": "3300 Solihull Parkway\nBirmingham Business Park\nB37 7YQ"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"email",
{
"type": "abuse"
},
"text",
"[email protected]"
]
]
],
"roles": [
"administrative",
"technical"
],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/21369",
"rel": "self",
"href": "https://rdap.db.ripe.net/entity/ATOS5-RIPE"
},
{
"value": "http://www.ripe.net/data-tools/support/documentation/terms",
"rel": "copyright",
"href": "http://www.ripe.net/data-tools/support/documentation/terms"
}
],
"objectClassName": "entity"
},
{
"handle": "ORG-AISU1-RIPE",
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"Atos IT Services UK Ltd"
],
[
"kind",
{},
"text",
"org"
],
[
"adr",
{
"label": "Sixth Floor, Midcity Place, 71 High Holborn\nWC1V 6EA\nLondon\nUNITED KINGDOM"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"tel",
{
"type": "voice"
},
"text",
"+448007833040"
],
[
"tel",
{
"type": "fax"
},
"text",
"+441616018842"
]
]
],
"roles": [
"registrant"
],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/21369",
"rel": "self",
"href": "https://rdap.db.ripe.net/entity/ORG-AISU1-RIPE"
},
{
"value": "http://www.ripe.net/data-tools/support/documentation/terms",
"rel": "copyright",
"href": "http://www.ripe.net/data-tools/support/documentation/terms"
}
],
"objectClassName": "entity"
},
{
"handle": "RIPE-NCC-END-MNT",
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"REDACTED"
],
[
"kind",
{},
"text",
"individual"
]
]
],
"roles": [
"registrant"
],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/21369",
"rel": "self",
"href": "https://rdap.db.ripe.net/entity/RIPE-NCC-END-MNT"
},
{
"value": "http://www.ripe.net/data-tools/support/documentation/terms",
"rel": "copyright",
"href": "http://www.ripe.net/data-tools/support/documentation/terms"
}
],
"objectClassName": "entity"
},
{
"handle": "SEMA-UK-AS-MNT",
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"REDACTED"
],
[
"kind",
{},
"text",
"individual"
]
]
],
"roles": [
"registrant"
],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/21369",
"rel": "self",
"href": "https://rdap.db.ripe.net/entity/SEMA-UK-AS-MNT"
},
{
"value": "http://www.ripe.net/data-tools/support/documentation/terms",
"rel": "copyright",
"href": "http://www.ripe.net/data-tools/support/documentation/terms"
}
],
"objectClassName": "entity"
},
{
"handle": "AA30342-RIPE",
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"AIS-UK-ABUSE-CONTACT"
],
[
"kind",
{},
"text",
"group"
],
[
"adr",
{
"label": "3300 Solihull Parkway\nBirmingham Business Park\nBirmingham\nB37 7YQ"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"email",
{
"type": "abuse"
},
"text",
"[email protected]"
]
]
],
"roles": [
"abuse"
],
"entities": [
{
"handle": "SEMA-UK-AS-MNT",
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"REDACTED"
],
[
"kind",
{},
"text",
"individual"
]
]
],
"roles": [
"registrant"
],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/21369",
"rel": "self",
"href": "https://rdap.db.ripe.net/entity/SEMA-UK-AS-MNT"
},
{
"value": "http://www.ripe.net/data-tools/support/documentation/terms",
"rel": "copyright",
"href": "http://www.ripe.net/data-tools/support/documentation/terms"
}
],
"objectClassName": "entity"
}
],
"objectClassName": "entity"
}
],
"remarks": [
{
"description": [
"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"
]
}
],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/21369",
"rel": "rdap-up",
"href": "https://rdap.db.ripe.net/autnums/rirSearch1/rdap-up/AS21369",
"type": "application/rdap+json"
},
{
"value": "https://rdap.db.ripe.net/autnum/21369",
"rel": "rdap-up rdap-active",
"href": "https://rdap.db.ripe.net/autnums/rirSearch1/rdap-up/AS21369?status=active",
"type": "application/rdap+json"
},
{
"value": "https://rdap.db.ripe.net/autnum/21369",
"rel": "rdap-down",
"href": "https://rdap.db.ripe.net/autnums/rirSearch1/rdap-down/AS21369",
"type": "application/rdap+json"
},
{
"value": "https://rdap.db.ripe.net/autnum/21369",
"rel": "rdap-top",
"href": "https://rdap.db.ripe.net/autnums/rirSearch1/rdap-top/AS21369",
"type": "application/rdap+json"
},
{
"value": "https://rdap.db.ripe.net/autnum/21369",
"rel": "rdap-top rdap-active",
"href": "https://rdap.db.ripe.net/autnums/rirSearch1/rdap-top/AS21369?status=active",
"type": "application/rdap+json"
},
{
"value": "https://rdap.db.ripe.net/autnum/21369",
"rel": "rdap-bottom",
"href": "https://rdap.db.ripe.net/autnums/rirSearch1/rdap-bottom/AS21369",
"type": "application/rdap+json"
},
{
"value": "https://rdap.db.ripe.net/autnum/21369",
"rel": "self",
"href": "https://rdap.db.ripe.net/autnum/21369",
"type": "application/rdap+json"
},
{
"value": "http://www.ripe.net/data-tools/support/documentation/terms",
"rel": "copyright",
"href": "http://www.ripe.net/data-tools/support/documentation/terms"
}
],
"events": [
{
"eventAction": "registration",
"eventDate": "2001-11-15T09:27:21Z"
},
{
"eventAction": "last changed",
"eventDate": "2023-01-03T10:00:37Z"
}
],
"rdapConformance": [
"nro_rdap_profile_asn_flat_0",
"rirSearch1",
"autnums",
"cidr0",
"rdap_level_0",
"nro_rdap_profile_0",
"redacted"
],
"notices": [
{
"title": "Filtered",
"description": [
"This output has been filtered."
]
},
{
"title": "Whois Inaccuracy Reporting",
"description": [
"If you see inaccuracies in the results, please visit:"
],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/21369",
"rel": "inaccuracy-report",
"href": "https://www.ripe.net/contact-form?topic=ripe_dbm&show_form=true",
"type": "text/html"
}
]
},
{
"title": "Source",
"description": [
"Objects returned came from source",
"RIPE"
]
},
{
"title": "Terms and Conditions",
"description": [
"This is the RIPE Database query service. The objects are in RDAP format."
],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/21369",
"rel": "terms-of-service",
"href": "http://www.ripe.net/db/support/db-terms-conditions.pdf",
"type": "application/pdf"
}
]
}
],
"port43": "whois.ripe.net",
"objectClassName": "autnum",
"redacted": [
{
"name": {
"description": "Personal e-mail information"
},
"reason": {
"description": "Personal data"
},
"prePath": "$.entities[?(@.handle=='ATOS5-RIPE')].vcardArray[1][?(@[0]=='e-mail')]",
"method": "removal"
},
{
"name": {
"description": "Personal e-mail information"
},
"reason": {
"description": "Personal data"
},
"prePath": "$.entities[?(@.handle=='ORG-AISU1-RIPE')].vcardArray[1][?(@[0]=='e-mail')]",
"method": "removal"
},
{
"name": {
"description": "Personal e-mail information"
},
"reason": {
"description": "Personal data"
},
"prePath": "$.entities[?(@.handle=='AA30342-RIPE')].vcardArray[1][?(@[0]=='e-mail')]",
"method": "removal"
}
]
} Contact details of private individuals are redacted.