Organization
Czech Telecommunication Office
CTU_AS4_2
Registered
Mar 08, 2016
10 years ago
IPv4 Prefixes
2
768 addresses
IPv6 Prefixes
3
458,752 × /48
BGP Neighbours
1
1 upstream/peer · 0 downstream
Registration
AS Number AS203208 AS Name CTU_AS4_2 Organization Czech Telecommunication Office Organization ID ORG-CTO1-RIPE Address Sokolovska 219, 19000, Prague, CZECH REPUBLIC Country Czechia (CZ) Registry RIPE NCC Allocated Mar 08, 2016 Record Created Mar 08, 2016 Last Updated Jul 04, 2025 Status
active
WHOIS Server whois.ripe.net AS Description CTU_AS4_2 - Czech Telecommunication Office, CZ Abuse Email [email protected] IPv4 Prefixes
2 prefixes · 768 addresses Routing data as of 2026-10-11 00:00 UTC
| Prefix | Range | Addresses |
|---|---|---|
| 185.68.212.0/23 | 185.68.212.0 – 185.68.213.255 | 512 |
| 185.68.214.0/24 | 185.68.214.0 – 185.68.214.255 | 256 |
IPv6 Prefixes
3 prefixes · 458,752 × /48 Routing data as of 2026-10-11 00:00 UTC
| Prefix | Addresses |
|---|---|
| 2a05:1c40:: | 298 |
| 2a05:1c44:: | 297 |
| 2a05:1c46:: | 296 |
BGP Neighbours
1 unique neighbour · 1 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 (1)
AS Name AS paths IPv4 sightings IPv6 sightings AS6855 SK-TELEKOM Slovak Telekom, a.s. 349 668 1,008
Raw RDAP Response
{
"handle": "AS203208",
"startAutnum": 203208,
"endAutnum": 203208,
"name": "CTU_AS4_2",
"status": [
"active"
],
"entities": [
{
"handle": "JK16414-RIPE",
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"REDACTED"
],
[
"kind",
{},
"text",
"individual"
]
]
],
"roles": [
"technical"
],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/203208",
"rel": "self",
"href": "https://rdap.db.ripe.net/entity/JK16414-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-CTO1-RIPE",
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"Czech Telecommunication Office"
],
[
"kind",
{},
"text",
"org"
],
[
"adr",
{
"label": "Sokolovska 219\n19000\nPrague\nCZECH REPUBLIC"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"tel",
{
"type": "voice"
},
"text",
"+420224004601"
],
[
"tel",
{
"type": "fax"
},
"text",
"+420224004827"
]
]
],
"roles": [
"registrant"
],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/203208",
"rel": "self",
"href": "https://rdap.db.ripe.net/entity/ORG-CTO1-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/203208",
"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": "SS41216-RIPE",
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"REDACTED"
],
[
"kind",
{},
"text",
"individual"
]
]
],
"roles": [
"administrative"
],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/203208",
"rel": "self",
"href": "https://rdap.db.ripe.net/entity/SS41216-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": "SUPER-CTU",
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"REDACTED"
],
[
"kind",
{},
"text",
"individual"
]
]
],
"roles": [
"registrant"
],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/203208",
"rel": "self",
"href": "https://rdap.db.ripe.net/entity/SUPER-CTU"
},
{
"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": "AC28632-RIPE",
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"Abuse Contact"
],
[
"kind",
{},
"text",
"group"
],
[
"adr",
{
"label": "Czech Telecommunication Office\nStanislav Schmied\nJan Krusina\nSokolovska 219\n19000\nPrague\nCZECH REPUBLIC"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"email",
{
"type": "abuse"
},
"text",
"[email protected]"
]
]
],
"roles": [
"abuse"
],
"entities": [
{
"handle": "SUPER-CTU",
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"REDACTED"
],
[
"kind",
{},
"text",
"individual"
]
]
],
"roles": [
"registrant"
],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/203208",
"rel": "self",
"href": "https://rdap.db.ripe.net/entity/SUPER-CTU"
},
{
"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"
}
],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/203208",
"rel": "rdap-up",
"href": "https://rdap.db.ripe.net/autnums/rirSearch1/rdap-up/AS203208",
"type": "application/rdap+json"
},
{
"value": "https://rdap.db.ripe.net/autnum/203208",
"rel": "rdap-up rdap-active",
"href": "https://rdap.db.ripe.net/autnums/rirSearch1/rdap-up/AS203208?status=active",
"type": "application/rdap+json"
},
{
"value": "https://rdap.db.ripe.net/autnum/203208",
"rel": "rdap-down",
"href": "https://rdap.db.ripe.net/autnums/rirSearch1/rdap-down/AS203208",
"type": "application/rdap+json"
},
{
"value": "https://rdap.db.ripe.net/autnum/203208",
"rel": "rdap-top",
"href": "https://rdap.db.ripe.net/autnums/rirSearch1/rdap-top/AS203208",
"type": "application/rdap+json"
},
{
"value": "https://rdap.db.ripe.net/autnum/203208",
"rel": "rdap-top rdap-active",
"href": "https://rdap.db.ripe.net/autnums/rirSearch1/rdap-top/AS203208?status=active",
"type": "application/rdap+json"
},
{
"value": "https://rdap.db.ripe.net/autnum/203208",
"rel": "rdap-bottom",
"href": "https://rdap.db.ripe.net/autnums/rirSearch1/rdap-bottom/AS203208",
"type": "application/rdap+json"
},
{
"value": "https://rdap.db.ripe.net/autnum/203208",
"rel": "self",
"href": "https://rdap.db.ripe.net/autnum/203208",
"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": "2016-03-08T14:32:58Z"
},
{
"eventAction": "last changed",
"eventDate": "2025-07-04T09:55:24Z"
}
],
"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/203208",
"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/203208",
"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": "$.entities[?(@.handle=='ORG-CTO1-RIPE')].vcardArray[1][?(@[0]=='e-mail')]",
"method": "removal"
},
{
"name": {
"description": "Personal e-mail information"
},
"reason": {
"description": "Personal data"
},
"prePath": "$.entities[?(@.handle=='AC28632-RIPE')].vcardArray[1][?(@[0]=='e-mail')]",
"method": "removal"
}
]
} Contact details of private individuals are redacted.