Whois & RDAP Lookup
38.181.80.0/21
RDAPIP Range38.181.80.0 - 38.181.87.255
HandleNET-38-181-80-0-1
NameSTACKS-CGNT-NET-1
TypeALLOCATION
HolderSTACKS INC
Registered2024-09-26 16:09 UTC
Updated2024-09-27 09:33 UTC
RegistrantSTACKS INC
Address1665 LOGAN ST, DENVER, CO, 80203, United States
Admin ContactLai Zhang
Email[email protected]
Phone+1-626-890-5790
Address1665 LOGAN ST, DENVER, CO, 80203, United States
Tech Contactnoc noc
Email[email protected]
Phone+43423455
Addressasdadfdasfdas dsafdasf, dstar, , 12345, American Samoa
Abuse Contact[email protected]
Abuse Phone+43423455
Statusactive
Registry RDAPhttps://rdap.arin.net
Raw WHOIS response
# # ARIN WHOIS data and services are subject to the Terms of Use # available at: https://www.arin.net/resources/registry/whois/tou/ # # If you see inaccuracies in the results, please report at # https://www.arin.net/resources/registry/whois/inaccuracy_reporting/ # # Copyright 1997-2026, American Registry for Internet Numbers, Ltd. # # start NetRange: 38.0.0.0 - 38.255.255.255 CIDR: 38.0.0.0/8 NetName: COGENT-A NetHandle: NET-38-0-0-0-1 Parent: () NetType: Direct Allocation OriginAS: Organization: Cogent Communications, LLC (COGC) RegDate: 1991-04-16 Updated: 2025-09-23 Ref: https://rdap.arin.net/registry/ip/38.0.0.0 OrgName: Cogent Communications, LLC OrgId: COGC Address: 2450 N Street NW City: Washington StateProv: DC PostalCode: 20037 Country: US RegDate: 2000-05-30 Updated: 2025-09-23 Comment: Geofeed https://geofeed.cogentco.com/geofeed.csv Ref: https://rdap.arin.net/registry/entity/COGC ReferralServer: rwhois://rwhois.cogentco.com:4321 OrgAbuseHandle: COGEN-ARIN OrgAbuseName: Cogent Abuse OrgAbusePhone: +1-877-875-4311 OrgAbuseEmail: [email protected] OrgAbuseRef: https://rdap.arin.net/registry/entity/COGEN-ARIN OrgNOCHandle: ZC108-ARIN OrgNOCName: Cogent Communications OrgNOCPhone: +1-877-875-4311 OrgNOCEmail: [email protected] OrgNOCRef: https://rdap.arin.net/registry/entity/ZC108-ARIN OrgTechHandle: IPALL-ARIN OrgTechName: IP Allocation OrgTechPhone: +1-877-875-4311 OrgTechEmail: [email protected] OrgTechRef: https://rdap.arin.net/registry/entity/IPALL-ARIN # end # start NetRange: 38.181.80.0 - 38.181.87.255 CIDR: 38.181.80.0/21 NetName: STACKS-CGNT-NET-1 NetHandle: NET-38-181-80-0-1 Parent: COGENT-A (NET-38-0-0-0-1) NetType: Reallocated OriginAS: Organization: STACKS INC (STACK-10) RegDate: 2024-09-26 Updated: 2024-09-27 Comment: GeoFeed https://www.stacksinc.net/geofeed.csv Ref: https://rdap.arin.net/registry/ip/38.181.80.0 OrgName: STACKS INC OrgId: STACK-10 Address: 1665 LOGAN ST City: DENVER StateProv: CO PostalCode: 80203 Country: US RegDate: 2020-08-05 Updated: 2026-02-23 Comment: GeoFeed https://www.stacksinc.net/geofeed.csv Ref: https://rdap.arin.net/registry/entity/STACK-10 OrgNOCHandle: CHONG52-ARIN OrgNOCName: chong, joey OrgNOCPhone: +1-626-890-5790 OrgNOCEmail: [email protected] OrgNOCRef: https://rdap.arin.net/registry/entity/CHONG52-ARIN OrgTechHandle: CHONG52-ARIN OrgTechName: chong, joey OrgTechPhone: +1-626-890-5790 OrgTechEmail: [email protected] OrgTechRef: https://rdap.arin.net/registry/entity/CHONG52-ARIN OrgDNSHandle: NOCNO72-ARIN OrgDNSName: noc, noc OrgDNSPhone: +43423455 OrgDNSEmail: [email protected] OrgDNSRef: https://rdap.arin.net/registry/entity/NOCNO72-ARIN OrgAbuseHandle: NOCNO72-ARIN OrgAbuseName: noc, noc OrgAbusePhone: +43423455 OrgAbuseEmail: [email protected] OrgAbuseRef: https://rdap.arin.net/registry/entity/NOCNO72-ARIN OrgNOCHandle: NOCNO72-ARIN OrgNOCName: noc, noc OrgNOCPhone: +43423455 OrgNOCEmail: [email protected] OrgNOCRef: https://rdap.arin.net/registry/entity/NOCNO72-ARIN OrgRoutingHandle: CHONG52-ARIN OrgRoutingName: chong, joey OrgRoutingPhone: +1-626-890-5790 OrgRoutingEmail: [email protected] OrgRoutingRef: https://rdap.arin.net/registry/entity/CHONG52-ARIN OrgTechHandle: NOCNO72-ARIN OrgTechName: noc, noc OrgTechPhone: +43423455 OrgTechEmail: [email protected] OrgTechRef: https://rdap.arin.net/registry/entity/NOCNO72-ARIN OrgDNSHandle: CHONG52-ARIN OrgDNSName: chong, joey OrgDNSPhone: +1-626-890-5790 OrgDNSEmail: [email protected] OrgDNSRef: https://rdap.arin.net/registry/entity/CHONG52-ARIN OrgAbuseHandle: CHONG52-ARIN OrgAbuseName: chong, joey OrgAbusePhone: +1-626-890-5790 OrgAbuseEmail: [email protected] OrgAbuseRef: https://rdap.arin.net/registry/entity/CHONG52-ARIN OrgRoutingHandle: NOCNO72-ARIN OrgRoutingName: noc, noc OrgRoutingPhone: +43423455 OrgRoutingEmail: [email protected] OrgRoutingRef: https://rdap.arin.net/registry/entity/NOCNO72-ARIN # end # # ARIN WHOIS data and services are subject to the Terms of Use # available at: https://www.arin.net/resources/registry/whois/tou/ # # If you see inaccuracies in the results, please report at # https://www.arin.net/resources/registry/whois/inaccuracy_reporting/ # # Copyright 1997-2026, American Registry for Internet Numbers, Ltd. # %rwhois V-1.5:0010b0:00 rwhois.cogentco.com (CGNT rwhoisd 1.2.2) network:ID:NET4-26B5500015 network:Network-Name:NET4-26B5500015 network:IP-Network:38.181.80.0/21 network:Org-Name:STACKS INC network:Street-Address:11 GREAT OAKS BLVD network:City:SAN JOSE network:State:CA network:Country:US network:Postal-Code:95119 network:Tech-Contact:ZC108-ARIN network:Updated:2025-04-29 23:01:11 %ok % Query time: 1219 msec % WHEN: Sun Aug 30 07:49:41 UTC 2026
Raw RDAP JSON (registry) https://rdap.arin.net
{
"arin_originas0_originautnums": [],
"cidr0_cidrs": [
{
"length": 21,
"v4prefix": "38.181.80.0"
}
],
"endAddress": "38.181.87.255",
"entities": [
{
"entities": [
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2025-02-15T10:39:14-05:00"
},
{
"eventAction": "registration",
"eventDate": "2025-02-15T10:39:14-05:00"
}
],
"handle": "NOCNO72-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/NOCNO72-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/38.181.80.0/21"
},
{
"href": "https://whois.arin.net/rest/poc/NOCNO72-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/38.181.80.0/21"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"remarks": [
{
"description": [
"ARIN has attempted to validate the data for this POC, but has received no response from the POC since 2026-02-15"
],
"title": "Unvalidated POC"
}
],
"roles": [
"routing",
"technical",
"dns",
"noc",
"abuse"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "asdadfdasfdas dsafdasf\ndstar\n\n12345\nAmerican Samoa"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"noc noc"
],
[
"n",
{},
"text",
[
"noc",
"noc",
"",
"",
""
]
],
[
"kind",
{},
"text",
"individual"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+43423455"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-02-23T22:34:53-05:00"
},
{
"eventAction": "registration",
"eventDate": "2020-08-04T03:51:44-04:00"
}
],
"handle": "ZHANG335-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/ZHANG335-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/38.181.80.0/21"
},
{
"href": "https://whois.arin.net/rest/poc/ZHANG335-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/38.181.80.0/21"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"remarks": [
{
"description": [
"https://www.stacksinc.net"
],
"title": "Registration Comments"
}
],
"roles": [
"administrative"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "1665 LOGAN ST\nDENVER\nCO\n80203\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"Lai Zhang"
],
[
"n",
{},
"text",
[
"Zhang",
"Lai",
"",
"",
""
]
],
[
"kind",
{},
"text",
"individual"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-626-890-5790"
]
]
]
},
{
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-02-23T21:19:09-05:00"
},
{
"eventAction": "registration",
"eventDate": "2025-02-17T02:33:08-05:00"
}
],
"handle": "CHONG52-ARIN",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/CHONG52-ARIN",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/38.181.80.0/21"
},
{
"href": "https://whois.arin.net/rest/poc/CHONG52-ARIN",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/38.181.80.0/21"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"roles": [
"abuse",
"noc",
"technical",
"dns",
"routing"
],
"status": [
"validated"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"adr",
{
"label": "adfg3211\nDENVER\nCO\n80203\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"fn",
{},
"text",
"joey chong"
],
[
"n",
{},
"text",
[
"chong",
"joey",
"",
"",
""
]
],
[
"kind",
{},
"text",
"individual"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"tel",
{
"type": [
"work",
"voice"
]
},
"text",
"+1-626-890-5790"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2026-02-23T22:38:01-05:00"
},
{
"eventAction": "registration",
"eventDate": "2020-08-05T11:01:36-04:00"
}
],
"handle": "STACK-10",
"links": [
{
"href": "https://rdap.arin.net/registry/entity/STACK-10",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/38.181.80.0/21"
},
{
"href": "https://whois.arin.net/rest/org/STACK-10",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/38.181.80.0/21"
}
],
"objectClassName": "entity",
"port43": "whois.arin.net",
"remarks": [
{
"description": [
"GeoFeed https://www.stacksinc.net/geofeed.csv"
],
"title": "Registration Comments"
}
],
"roles": [
"registrant"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"STACKS INC"
],
[
"adr",
{
"label": "1665 LOGAN ST\nDENVER\nCO\n80203\nUnited States"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"kind",
{},
"text",
"org"
]
]
]
}
],
"events": [
{
"eventAction": "last changed",
"eventDate": "2024-09-27T05:33:10-04:00"
},
{
"eventAction": "registration",
"eventDate": "2024-09-26T12:09:48-04:00"
}
],
"handle": "NET-38-181-80-0-1",
"ipVersion": "v4",
"links": [
{
"href": "https://rdap.arin.net/registry/ip/38.181.80.0",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/38.181.80.0/21"
},
{
"href": "https://whois.arin.net/rest/net/NET-38-181-80-0-1",
"rel": "alternate",
"type": "application/xml",
"value": "https://rdap.arin.net/registry/ip/38.181.80.0/21"
},
{
"href": "https://rdap.arin.net/registry/ip/38.0.0.0/8",
"rel": "up",
"type": "application/rdap+json",
"value": "https://rdap.arin.net/registry/ip/38.181.80.0/21"
}
],
"name": "STACKS-CGNT-NET-1",
"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/38.181.80.0/21"
}
],
"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/38.181.80.0/21"
}
],
"title": "Whois Inaccuracy Reporting"
},
{
"description": [
"Copyright 1997-2026, American Registry for Internet Numbers, Ltd."
],
"title": "Copyright Notice"
}
],
"objectClassName": "ip network",
"parentHandle": "NET-38-0-0-0-1",
"port43": "whois.arin.net",
"rdapConformance": [
"nro_rdap_profile_0",
"rdap_level_0",
"cidr0",
"arin_originas0"
],
"remarks": [
{
"description": [
"GeoFeed https://www.stacksinc.net/geofeed.csv"
],
"title": "Registration Comments"
}
],
"startAddress": "38.181.80.0",
"status": [
"active"
],
"type": "ALLOCATION"
}Frequently asked questions
What is WHOIS?
WHOIS is a public directory that answers "who is responsible for this?" for domains, IP ranges and ASNs. It lists registration dates, the registrar, nameservers and contacts.
What is RDAP, and how does it differ?
RDAP is the modern replacement for WHOIS. It returns the same records in a structured, consistent format. We query RDAP first and fall back to classic WHOIS text when a registry has not adopted it yet.
What is the difference between a registrar and a registrant?
The registrar is the company you register and manage a domain through, such as xTom or GoDaddy. The registrant is the person or organization that actually holds the domain.
What are nameservers?
Nameservers answer DNS questions for a domain and decide which IP addresses the name resolves to. They also show which DNS provider the domain uses.
What is DNSSEC?
DNSSEC adds cryptographic signatures to DNS answers so they cannot be quietly altered in transit. "Signed" means the domain has it enabled, "unsigned" means it does not.
Why is the contact information redacted?
Privacy laws such as GDPR require registrars to hide most personal details in public records. The abuse contact is usually still shown, so a domain or network can be reported when something goes wrong.