Whois & RDAP Lookup
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IP Geolocation RDAPIP Range240c:c000:: - 240c:cfff:ffff:ffff:ffff:ffff:ffff:ffff
Handle240c:c000::/20
NameCERNET
TypeALLOCATED PORTABLE
CountryCN
HolderChina Education and Research Network (CERNET)
Registered2019-01-29 23:26 UTC
Updated2023-08-28 06:40 UTC
RegistrantChina Education and Research Network (CERNET)
Email[email protected]
Phone+86-10-62785983
AddressFIT 3-220,, Tsinghua University
Admin ContactCERNET Helpdesk
Email[email protected]
Phone+86-10-6278-4049
AddressCERNET Center, Beijing 100084, China
Tech ContactCERNET Helpdesk
Email[email protected]
Phone+86-10-6278-4049
AddressCERNET Center, Beijing 100084, China
Abuse Contact[email protected]
Abuse Phone+86-10-62784301
Statusactive
Registry RDAPhttps://rdap.apnic.net
Raw WHOIS response
% [whois.apnic.net] % Whois data copyright terms http://www.apnic.net/db/dbcopyright.html % Information related to '240c:c000::/20' % Abuse contact for '240c:c000::/20' is '[email protected]' inet6num: 240c:c000::/20 netname: CERNET descr: China Education and Research Network descr: Tsinghua University country: CN org: ORG-CEAR1-AP admin-c: CER-AP tech-c: CER-AP abuse-c: AC1685-AP status: ALLOCATED PORTABLE remarks: -------------------------------------------- remarks: To report network abuse, please contact mnt-irt remarks: For troubleshooting, please contact tech-c and admin-c remarks: Report invalid contact via www.apnic.net/invalidcontact remarks: ----------------------------------------------- mnt-by: APNIC-HM mnt-lower: MAINT-CERNET-AP mnt-routes: MAINT-CERNET-AP mnt-irt: IRT-CERNET-AP last-modified: 2023-08-28T06:40:49Z source: APNIC irt: IRT-CERNET-AP address: Network Center, address: FIT-3-220, Tsinghua Univ address: Beijing 100084, China phone: +86-10-62784301 fax-no: +86-10-62785933 e-mail: [email protected] abuse-mailbox: [email protected] admin-c: CER-AP tech-c: CER-AP auth: # Filtered remarks: timezone GMT+8 remarks: [email protected] was validated on 2026-09-10 mnt-by: MAINT-CERNET-AP last-modified: 2026-09-10T07:51:56Z source: APNIC organisation: ORG-CEAR1-AP org-name: China Education and Research Network (CERNET) country: CN address: FIT 3-220, address: Tsinghua University phone: +86-10-62785983 fax-no: +86-10-62785933 e-mail: [email protected] mnt-ref: APNIC-HM mnt-by: APNIC-HM last-modified: 2018-09-13T12:56:34Z source: APNIC role: ABUSE CERNETAP country: ZZ address: Network Center, address: FIT-3-220, Tsinghua Univ address: Beijing 100084, China phone: +86-10-62784301 e-mail: [email protected] admin-c: CER-AP tech-c: CER-AP nic-hdl: AC1685-AP remarks: Generated from irt object IRT-CERNET-AP remarks: [email protected] was validated on 2026-09-10 abuse-mailbox: [email protected] mnt-by: APNIC-ABUSE last-modified: 2026-09-10T07:52:32Z source: APNIC role: CERNET Helpdesk address: CERNET Center address: Beijing 100084, China country: CN phone: +86-10-6278-4049 fax-no: +86-10-6278-5933 e-mail: [email protected] remarks: [email protected] admin-c: XL1-CN tech-c: SZ2-AP nic-hdl: CER-AP mnt-by: MAINT-CERNET-AP last-modified: 2020-09-03T09:14:12Z source: APNIC % Information related to '240c:c000::/20AS23910' route6: 240c:c000::/20 descr: CERNET origin: AS23910 mnt-by: MAINT-CERNET-AP last-modified: 2020-08-31T01:22:02Z source: APNIC % This query was served by the APNIC Whois Service version 1.88.48 (WHOIS-JP1) % Query time: 628 msec % WHEN: Sun Sep 20 03:31:01 UTC 2026
Raw RDAP JSON (registry) https://rdap.apnic.net
{
"cidr0_cidrs": [
{
"length": 20,
"v6prefix": "240c:c000::"
}
],
"country": "CN",
"endAddress": "240c:cfff:ffff:ffff:ffff:ffff:ffff:ffff",
"entities": [
{
"events": [
{
"eventAction": "registration",
"eventDate": "2017-12-20T12:57:07Z"
},
{
"eventAction": "last changed",
"eventDate": "2018-09-13T12:56:34Z"
}
],
"handle": "ORG-CEAR1-AP",
"links": [
{
"href": "https://rdap.apnic.net/entity/ORG-CEAR1-AP",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.apnic.net/ip/240c:c0a9:1008::229"
}
],
"objectClassName": "entity",
"roles": [
"registrant"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"China Education and Research Network (CERNET)"
],
[
"kind",
{},
"text",
"org"
],
[
"adr",
{
"label": "FIT 3-220,\nTsinghua University"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"tel",
{
"type": "voice"
},
"text",
"+86-10-62785983"
],
[
"tel",
{
"type": "fax"
},
"text",
"+86-10-62785933"
],
[
"email",
{},
"text",
"[email protected]"
]
]
]
},
{
"events": [
{
"eventAction": "registration",
"eventDate": "2008-09-04T07:54:16Z"
},
{
"eventAction": "last changed",
"eventDate": "2020-09-03T09:14:12Z"
}
],
"handle": "CER-AP",
"links": [
{
"href": "https://rdap.apnic.net/entity/CER-AP",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.apnic.net/ip/240c:c0a9:1008::229"
}
],
"objectClassName": "entity",
"remarks": [
{
"description": [
"[email protected]"
],
"title": "remarks"
}
],
"roles": [
"administrative",
"technical"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"CERNET Helpdesk"
],
[
"kind",
{},
"text",
"group"
],
[
"adr",
{
"label": "CERNET Center\nBeijing 100084, China"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"tel",
{
"type": "voice"
},
"text",
"+86-10-6278-4049"
],
[
"tel",
{
"type": "fax"
},
"text",
"+86-10-6278-5933"
],
[
"email",
{},
"text",
"[email protected]"
]
]
]
},
{
"events": [
{
"eventAction": "registration",
"eventDate": "2010-11-26T03:14:01Z"
},
{
"eventAction": "last changed",
"eventDate": "2026-09-10T07:51:56Z"
}
],
"handle": "IRT-CERNET-AP",
"links": [
{
"href": "https://rdap.apnic.net/entity/IRT-CERNET-AP",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.apnic.net/ip/240c:c0a9:1008::229"
}
],
"objectClassName": "entity",
"remarks": [
{
"description": [
"timezone GMT+8",
"[email protected] was validated on 2026-09-10"
],
"title": "remarks"
}
],
"roles": [
"abuse"
],
"vcardArray": [
"vcard",
[
[
"version",
{},
"text",
"4.0"
],
[
"fn",
{},
"text",
"IRT-CERNET-AP"
],
[
"kind",
{},
"text",
"group"
],
[
"adr",
{
"label": "Network Center,\nFIT-3-220, Tsinghua Univ\nBeijing 100084, China"
},
"text",
[
"",
"",
"",
"",
"",
"",
""
]
],
[
"tel",
{
"type": "voice"
},
"text",
"+86-10-62784301"
],
[
"tel",
{
"type": "fax"
},
"text",
"+86-10-62785933"
],
[
"email",
{},
"text",
"[email protected]"
],
[
"email",
{
"pref": "1"
},
"text",
"[email protected]"
]
]
]
}
],
"events": [
{
"eventAction": "registration",
"eventDate": "2019-01-29T23:26:29Z"
},
{
"eventAction": "last changed",
"eventDate": "2023-08-28T06:40:49Z"
}
],
"handle": "240c:c000::/20",
"ipVersion": "v6",
"links": [
{
"href": "https://rdap.apnic.net/ip/240c:c000::/20",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.apnic.net/ip/240c:c0a9:1008::229"
}
],
"name": "CERNET",
"notices": [
{
"description": [
"Objects returned came from source",
"APNIC"
],
"title": "Source"
},
{
"description": [
"This is the APNIC WHOIS Database query service. The objects are in RDAP format."
],
"links": [
{
"href": "http://www.apnic.net/db/dbcopyright.html",
"rel": "terms-of-service",
"type": "text/html",
"value": "https://rdap.apnic.net/ip/240c:c0a9:1008::229"
}
],
"title": "Terms and Conditions"
},
{
"description": [
"If you see inaccuracies in the results, please visit: "
],
"links": [
{
"href": "https://www.apnic.net/manage-ip/using-whois/abuse-and-spamming/invalid-contact-form",
"rel": "inaccuracy-report",
"type": "text/html",
"value": "https://rdap.apnic.net/ip/240c:c0a9:1008::229"
}
],
"title": "Whois Inaccuracy Reporting"
}
],
"objectClassName": "ip network",
"port43": "whois.apnic.net",
"rdapConformance": [
"history_version_0",
"nro_rdap_profile_0",
"cidr0",
"rdap_level_0"
],
"remarks": [
{
"description": [
"China Education and Research Network",
"Tsinghua University"
],
"title": "description"
},
{
"description": [
"--------------------------------------------",
"To report network abuse, please contact mnt-irt",
"For troubleshooting, please contact tech-c and admin-c",
"Report invalid contact via www.apnic.net/invalidcontact",
"-----------------------------------------------"
],
"title": "remarks"
}
],
"startAddress": "240c:c000::",
"status": [
"active"
],
"type": "ALLOCATED PORTABLE"
}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.