205.240.0.4
ISP
Data retrieved at
Network
ASN
IP Range
Company
Cogent Communications, LLC
Registrant
Computer Systems Design Company
SPRINT-CDF00F
Using networksdb.io for network lookups.
Hostname
Not available.
AS Domain
cogentco.com
Using host.io for pre-visualize domains.
Type
ISP
Handle
NET-205-240-0-0-2
Registered
1995-04-25
Last Changed
2014-08-18
View raw RDAP
{
"arin_originas0_originautnums": [],
"cidr0_cidrs": [
{
"v4prefix": "205.240.0.0",
"length": 20
}
],
"endAddress": "205.240.15.255",
"entities": [
{
"entities": [
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-08-20T17:47:46-04:00"
},
{
"eventAction": "registration",
"eventDate": "1993-12-30T15:27:16-05:00"
}
],
"handle": "JN24-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/JN24-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/205.240.0.4"
},
{
"href": "https://whois.arin.net/rest/poc/JN24-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/205.240.0.4"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"administrative",
"technical"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "Computer Systems Design Company\r\n735 Highland Ave\nBoulder\nCO\n80302\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"John Nebel"
],
[
"n",
{},
"text",
[
"Nebel",
"John",
"",
"",
""
]
],
[
"kind",
{},
"text",
"individual"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-303-447-8025"
],
[
"tel",
{
"type": [
"work",
"cell"
]
},
"text",
"+1-303-618-7345"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-08-20T17:46:38-04:00"
},
{
"eventAction": "registration",
"eventDate": "1993-12-30T13:25:10-05:00"
}
],
"handle": "JN20-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/JN20-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/205.240.0.4"
},
{
"href": "https://whois.arin.net/rest/poc/JN20-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/205.240.0.4"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"noc",
"abuse"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "735 Highland Avenue\nBoulder\nCO\n80302\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"John Nebel"
],
[
"n",
{},
"text",
[
"Nebel",
"John",
"",
"",
""
]
],
[
"kind",
{},
"text",
"individual"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-303-447-8025"
],
[
"tel",
{
"type": [
"work",
"cell"
]
},
"text",
"+1-303-618-7345"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2024-11-04T09:05:17-05:00"
},
{
"eventAction": "registration",
"eventDate": "1994-12-20T00:00:00-05:00"
}
],
"handle": "CSD",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/CSD",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/205.240.0.4"
},
{
"href": "https://whois.arin.net/rest/org/CSD",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/205.240.0.4"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"registrant"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"Computer Systems Design Company"
],
[
"adr",
{
"label": "735 Highland Avenue\nBoulder\nCO\n80302\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"kind",
{},
"text",
"org"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-08-20T17:47:46-04:00"
},
{
"eventAction": "registration",
"eventDate": "1993-12-30T15:27:16-05:00"
}
],
"handle": "JN24-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/JN24-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/205.240.0.4"
},
{
"href": "https://whois.arin.net/rest/poc/JN24-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/205.240.0.4"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"abuse"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "Computer Systems Design Company\r\n735 Highland Ave\nBoulder\nCO\n80302\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"John Nebel"
],
[
"n",
{},
"text",
[
"Nebel",
"John",
"",
"",
""
]
],
[
"kind",
{},
"text",
"individual"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-303-447-8025"
],
[
"tel",
{
"type": [
"work",
"cell"
]
},
"text",
"+1-303-618-7345"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2014-08-18T18:01:48-04:00"
},
{
"eventAction": "registration",
"eventDate": "1995-04-25T00:00:00-04:00"
}
],
"handle": "NET-205-240-0-0-2",
"ipVersion": "v4",
"links": [
{
"href": "https://rdap.arin.net/registry/ip/205.240.0.0",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/205.240.0.4"
},
{
"href": "https://whois.arin.net/rest/net/NET-205-240-0-0-2",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/205.240.0.4"
},
{
"href": "https://rdap.arin.net/registry/ip/205.240.0.0/13",
"rel": "up",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/205.240.0.4"
}
],
"name": "SPRINT-CDF00F",
"notices": [
{
"description": [
"By using the ARIN RDAP/Whois service, you are agreeing to the RDAP/Whois Terms of Use"
],
"links": [
{
"href": "https://www.arin.net/resources/registry/whois/tou/",
"rel": "terms-of-service",
"type": "text/html",
"value": "https://rdap.arin.net/registry/ip/205.240.0.4"
}
],
"title": "Terms of Service"
},
{
"description": [
"If you see inaccuracies in the results, please visit: "
],
"links": [
{
"href": "https://www.arin.net/resources/registry/whois/inaccuracy_reporting/",
"rel": "inaccuracy-report",
"type": "text/html",
"value": "https://rdap.arin.net/registry/ip/205.240.0.4"
}
],
"title": "Whois Inaccuracy Reporting"
},
{
"description": [
"Copyright 1997-2026, American Registry for Internet Numbers, Ltd."
],
"title": "Copyright Notice"
}
],
"objectClassName": "ip network",
"parentHandle": "NET-205-240-0-0-1",
"port43": "whois.arin.net",
"rdapConformance": [
"nro_rdap_profile_0",
"rdap_level_0",
"cidr0",
"arin_originas0"
],
"startAddress": "205.240.0.0",
"status": [
"active"
],
"type": "ALLOCATION"
}
Security
No security threats detected for this IP.
VPN
Proxy
Tor
Hosting
Residential Proxy
Bogon
Abuser
Crawler
RPKI
RPKI Origin Validation
RPKI verifies that an IP prefix is legitimately announced by the authorized Autonomous System (ASN) using Route Origin Authorizations (ROAs).
Unknown.
No valid ROA was found for this prefix.
UNKNOWN
Validated Prefix
205.240.0.0/20
Authorized ASN
Not available.
Abuse Contacts
IP Geolocation
Country
United States
City
Boulder (📍 80309)
Colorado
Time Zone
America/Denver
Coordinates
40.0128, -105.2759
Continent
North America
European Union
No.
Phone prefix
+1
Currency
US Dollar (USD $)