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Look up an Autonomous System — holder, registry, contacts, announced IPv4/IPv6 prefixes, upstreams and downstreams.
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AS51941
BASEN-EU BaseN Oy Announcing routesAS nameBASEN-EU
OrganisationMNT-BASEN
Registry (RIR)RIPE NCC
HandleAS51941
RangeAS51941
Registered03 Dec 2010
Last changed02 Jul 2025
Abuse contact[email protected]
5IPv4 prefixes
5IPv6 prefixes
3Upstreams
0Downstreams
Upstreams
| AS | Network name | Visibility |
|---|---|---|
| AS6667 | EUNET-FINLAND Elisa Oyj | 313 |
| AS174 | COGENT-174 - Cogent Communications, LLC | 200 |
| AS2914 | NTT-DATA-2914 - NTT America, Inc. | 151 |
Downstreams
None seen.
IPv4 prefixes (5)
IPv6 prefixes (5)
RPKI-validate all prefixes of AS51941
Contacts
| Role | Name | Handle | Email / phone | Address |
|---|---|---|---|---|
| administrative, technical | Kaj J. Niemi | KJN-RIPE | +358 9 8562 6653 | BaseN Corporation, Salmisaarenaukio 1, FIN-00180 Helsinki, Finland |
| registrant | MNT-BASEN | MNT-BASEN | ||
| registrant | BaseN Oy | ORG-BC19-RIPE | +358 9 8562 6653 | Salmisaarenaukio 1, 00180, Helsinki, FINLAND |
| registrant | RIPE-NCC-END-MNT | RIPE-NCC-END-MNT | ||
| abuse | BaseN Administrator | BNA-RIPE | [email protected], +358 9 8562 6653 | BaseN Corporation, Salmisaarenaukio 1, FIN-00180 Helsinki, Finland |
| administrative, technical | Kaj J. Niemi | KJN-RIPE | +358 9 8562 6653 | BaseN Corporation, Salmisaarenaukio 1, FIN-00180 Helsinki, Finland |
| registrant | MNT-BASEN | MNT-BASEN | ||
| administrative, technical | Pasi Hurri | PH21 | +358 9 42824200 | BaseN Corporation, Salmisaarenaukio 1, FIN-00180 Helsinki, Finland |
Raw registry response
{
"handle": "AS51941",
"startAutnum": 51941,
"endAutnum": 51941,
"name": "BASEN-EU",
"status": [
"active"
],
"entities": [
{
"handle": "KJN-RIPE",
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[
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[
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{
"label": "BaseN Corporation\nSalmisaarenaukio 1\nFIN-00180 Helsinki\nFinland"
},
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""
]
],
[
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]
]
],
"roles": [
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],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/51941",
"rel": "self",
"href": "https://rdap.db.ripe.net/entity/KJN-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"
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{
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],
"roles": [
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"links": [
{
"value": "https://rdap.db.ripe.net/autnum/51941",
"rel": "self",
"href": "https://rdap.db.ripe.net/entity/MNT-BASEN"
},
{
"value": "http://www.ripe.net/data-tools/support/documentation/terms",
"rel": "copyright",
"href": "http://www.ripe.net/data-tools/support/documentation/terms"
}
],
"objectClassName": "entity"
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{
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{
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]
],
"roles": [
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],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/51941",
"rel": "self",
"href": "https://rdap.db.ripe.net/entity/ORG-BC19-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": [
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[
"fn",
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],
[
"kind",
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"text",
"individual"
],
[
"org",
[],
"text",
"ORG-NCC1-RIPE"
]
]
],
"roles": [
"registrant"
],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/51941",
"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": "BNA-RIPE",
"vcardArray": [
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"text",
"4.0"
],
[
"fn",
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"text",
"BaseN Administrator"
],
[
"kind",
[],
"text",
"group"
],
[
"adr",
{
"label": "BaseN Corporation\nSalmisaarenaukio 1\nFIN-00180 Helsinki\nFinland"
},
"text",
[
"",
"",
"",
"",
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""
]
],
[
"tel",
{
"type": "voice"
},
"text",
"+358 9 8562 6653"
],
[
"email",
{
"type": "abuse"
},
"text",
"[email protected]"
]
]
],
"roles": [
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],
"entities": [
{
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"vcardArray": [
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],
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"fn",
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"Kaj J. Niemi"
],
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"kind",
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],
[
"adr",
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]
],
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]
],
"roles": [
"administrative",
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],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/51941",
"rel": "self",
"href": "https://rdap.db.ripe.net/entity/KJN-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": "MNT-BASEN",
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[
[
"version",
[],
"text",
"4.0"
],
[
"fn",
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"MNT-BASEN"
],
[
"kind",
[],
"text",
"individual"
]
]
],
"roles": [
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],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/51941",
"rel": "self",
"href": "https://rdap.db.ripe.net/entity/MNT-BASEN"
},
{
"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": "PH21",
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"fn",
[],
"text",
"Pasi Hurri"
],
[
"kind",
[],
"text",
"individual"
],
[
"adr",
{
"label": "BaseN Corporation\nSalmisaarenaukio 1\nFIN-00180 Helsinki\nFinland"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"tel",
{
"type": "voice"
},
"text",
"+358 9 42824200"
]
]
],
"roles": [
"administrative",
"technical"
],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/51941",
"rel": "self",
"href": "https://rdap.db.ripe.net/entity/PH21"
},
{
"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/51941",
"rel": "rdap-up",
"href": "https://rdap.db.ripe.net/autnums/rirSearch1/rdap-up/AS51941",
"type": "application/rdap+json"
},
{
"value": "https://rdap.db.ripe.net/autnum/51941",
"rel": "rdap-up rdap-active",
"href": "https://rdap.db.ripe.net/autnums/rirSearch1/rdap-up/AS51941?status=active",
"type": "application/rdap+json"
},
{
"value": "https://rdap.db.ripe.net/autnum/51941",
"rel": "rdap-down",
"href": "https://rdap.db.ripe.net/autnums/rirSearch1/rdap-down/AS51941",
"type": "application/rdap+json"
},
{
"value": "https://rdap.db.ripe.net/autnum/51941",
"rel": "rdap-top",
"href": "https://rdap.db.ripe.net/autnums/rirSearch1/rdap-top/AS51941",
"type": "application/rdap+json"
},
{
"value": "https://rdap.db.ripe.net/autnum/51941",
"rel": "rdap-top rdap-active",
"href": "https://rdap.db.ripe.net/autnums/rirSearch1/rdap-top/AS51941?status=active",
"type": "application/rdap+json"
},
{
"value": "https://rdap.db.ripe.net/autnum/51941",
"rel": "rdap-bottom",
"href": "https://rdap.db.ripe.net/autnums/rirSearch1/rdap-bottom/AS51941",
"type": "application/rdap+json"
},
{
"value": "https://rdap.db.ripe.net/autnum/51941",
"rel": "self",
"href": "https://rdap.db.ripe.net/autnum/51941",
"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": "2010-12-03T08:36:08Z"
},
{
"eventAction": "last changed",
"eventDate": "2025-07-02T11:53:12Z"
}
],
"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/51941",
"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/51941",
"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": "$.entities[?(@.handle=='KJN-RIPE')].vcardArray[1][?(@[0]=='e-mail')]",
"method": "removal"
},
{
"name": {
"description": "Personal e-mail information"
},
"reason": {
"description": "Personal data"
},
"prePath": "$.entities[?(@.handle=='ORG-BC19-RIPE')].vcardArray[1][?(@[0]=='e-mail')]",
"method": "removal"
},
{
"name": {
"description": "Personal e-mail information"
},
"reason": {
"description": "Personal data"
},
"prePath": "$.entities[?(@.handle=='BNA-RIPE')].vcardArray[1][?(@[0]=='e-mail')]",
"method": "removal"
}
]
}Results come from public internet registries and live global routing data. Results are cached for up to an hour. Lookups are logged with your IP address to prevent abuse — see our Privacy Policy.