Free network tools
AS WHOIS
Look up an Autonomous System — holder, registry, contacts, announced IPv4/IPv6 prefixes, upstreams and downstreams.
Network Report (All-in-one) BGP Looking Glass BGP Security Check RPKI Validator BGP Hijack & Leak Monitor ASN Intelligence Internet Outages & Anomalies Country Internet Report Domain Insights IP WHOIS AS WHOIS
AS51572
CERULEAN Cerulean Solutions Limited Announcing routesAS nameCERULEAN
OrganisationCERULEAN-MNTR
Registry (RIR)RIPE NCC
HandleAS51572
RangeAS51572
Registered30 Sep 2010
Last changed24 Oct 2025
Abuse contact[email protected]
1IPv4 prefixes
0IPv6 prefixes
1Upstreams
0Downstreams
Upstreams
| AS | Network name | Visibility |
|---|---|---|
| AS25577 | C4L-AS MAINFRAME & CYBERNETIC SYSTEMS LIMITED | 229 |
Downstreams
None seen.
IPv4 prefixes (1)
RPKI-validate all prefixes of AS51572
Contacts
| Role | Name | Handle | Email / phone | Address |
|---|---|---|---|---|
| registrant | CERULEAN-MNTR | CERULEAN-MNTR | ||
| registrant | Cerulean Solutions Limited | ORG-CSL8-RIPE | +443452306670 | 120 Cockfosters Road, EN4 0DZ, Barnet, UNITED KINGDOM |
| registrant | RIPE-NCC-END-MNT | RIPE-NCC-END-MNT | ||
| administrative | Sajit Patel | SP9246-RIPE | +443452306670 | Cerulean Solutions Limited, 120 Cockfosters Road, Barnet, EN4 0DZ, GB |
| technical | Samir Patel | SP9247-RIPE | +443452306670 | Cerulean Solutions Limited, 120 Cockfosters Road, Barnet, EN4 0DZ, GB |
| abuse | Cerulean Solutions abuse contact | CSAC4-RIPE | [email protected] | 120 Cockfosters Road, Barnet, EN4 0DZ |
| registrant | CERULEAN-MNTR | CERULEAN-MNTR |
Raw registry response
{
"handle": "AS51572",
"startAutnum": 51572,
"endAutnum": 51572,
"name": "CERULEAN",
"status": [
"active"
],
"entities": [
{
"handle": "CERULEAN-MNTR",
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"fn",
[],
"text",
"CERULEAN-MNTR"
],
[
"kind",
[],
"text",
"individual"
]
]
],
"roles": [
"registrant"
],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/51572",
"rel": "self",
"href": "https://rdap.db.ripe.net/entity/CERULEAN-MNTR"
},
{
"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-CSL8-RIPE",
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"fn",
[],
"text",
"Cerulean Solutions Limited"
],
[
"kind",
[],
"text",
"org"
],
[
"adr",
{
"label": "120 Cockfosters Road\nEN4 0DZ\nBarnet\nUNITED KINGDOM"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"tel",
{
"type": "voice"
},
"text",
"+443452306670"
]
]
],
"roles": [
"registrant"
],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/51572",
"rel": "self",
"href": "https://rdap.db.ripe.net/entity/ORG-CSL8-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",
"RIPE-NCC-END-MNT"
],
[
"kind",
[],
"text",
"individual"
],
[
"org",
[],
"text",
"ORG-NCC1-RIPE"
]
]
],
"roles": [
"registrant"
],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/51572",
"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": "SP9246-RIPE",
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"fn",
[],
"text",
"Sajit Patel"
],
[
"kind",
[],
"text",
"individual"
],
[
"adr",
{
"label": "Cerulean Solutions Limited\n120 Cockfosters Road\nBarnet\nEN4 0DZ\nGB"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"tel",
{
"type": "voice"
},
"text",
"+443452306670"
]
]
],
"roles": [
"administrative"
],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/51572",
"rel": "self",
"href": "https://rdap.db.ripe.net/entity/SP9246-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": "SP9247-RIPE",
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"fn",
[],
"text",
"Samir Patel"
],
[
"kind",
[],
"text",
"individual"
],
[
"adr",
{
"label": "Cerulean Solutions Limited\n120 Cockfosters Road\nBarnet\nEN4 0DZ\nGB"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"tel",
{
"type": "voice"
},
"text",
"+443452306670"
]
]
],
"roles": [
"technical"
],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/51572",
"rel": "self",
"href": "https://rdap.db.ripe.net/entity/SP9247-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": "CSAC4-RIPE",
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"fn",
[],
"text",
"Cerulean Solutions abuse contact"
],
[
"kind",
[],
"text",
"group"
],
[
"adr",
{
"label": "120 Cockfosters Road\nBarnet\nEN4 0DZ"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"email",
{
"type": "abuse"
},
"text",
"[email protected]"
]
]
],
"roles": [
"abuse"
],
"entities": [
{
"handle": "CERULEAN-MNTR",
"vcardArray": [
"vcard",
[
[
"version",
[],
"text",
"4.0"
],
[
"fn",
[],
"text",
"CERULEAN-MNTR"
],
[
"kind",
[],
"text",
"individual"
]
]
],
"roles": [
"registrant"
],
"links": [
{
"value": "https://rdap.db.ripe.net/autnum/51572",
"rel": "self",
"href": "https://rdap.db.ripe.net/entity/CERULEAN-MNTR"
},
{
"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/51572",
"rel": "rdap-up",
"href": "https://rdap.db.ripe.net/autnums/rirSearch1/rdap-up/AS51572",
"type": "application/rdap+json"
},
{
"value": "https://rdap.db.ripe.net/autnum/51572",
"rel": "rdap-up rdap-active",
"href": "https://rdap.db.ripe.net/autnums/rirSearch1/rdap-up/AS51572?status=active",
"type": "application/rdap+json"
},
{
"value": "https://rdap.db.ripe.net/autnum/51572",
"rel": "rdap-down",
"href": "https://rdap.db.ripe.net/autnums/rirSearch1/rdap-down/AS51572",
"type": "application/rdap+json"
},
{
"value": "https://rdap.db.ripe.net/autnum/51572",
"rel": "rdap-top",
"href": "https://rdap.db.ripe.net/autnums/rirSearch1/rdap-top/AS51572",
"type": "application/rdap+json"
},
{
"value": "https://rdap.db.ripe.net/autnum/51572",
"rel": "rdap-top rdap-active",
"href": "https://rdap.db.ripe.net/autnums/rirSearch1/rdap-top/AS51572?status=active",
"type": "application/rdap+json"
},
{
"value": "https://rdap.db.ripe.net/autnum/51572",
"rel": "rdap-bottom",
"href": "https://rdap.db.ripe.net/autnums/rirSearch1/rdap-bottom/AS51572",
"type": "application/rdap+json"
},
{
"value": "https://rdap.db.ripe.net/autnum/51572",
"rel": "self",
"href": "https://rdap.db.ripe.net/autnum/51572",
"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": "2010-09-30T10:13:37Z"
},
{
"eventAction": "last changed",
"eventDate": "2025-10-24T17:33:19Z"
}
],
"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/51572",
"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/51572",
"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": "$.entities[?(@.handle=='ORG-CSL8-RIPE')].vcardArray[1][?(@[0]=='e-mail')]",
"method": "removal"
},
{
"name": {
"description": "Personal e-mail information"
},
"reason": {
"description": "Personal data"
},
"prePath": "$.entities[?(@.handle=='CSAC4-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.