Whois & RDAP Lookup
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RDAPHandleAS4538
NameERX-CERNET-BKB
CountryCN
Registered2008-09-04 06:40 UTC
Updated2025-10-31 08:14 UTC
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.arin.net
Raw RDAP JSON (registry) https://rdap.arin.net
{
"country": "CN",
"endAutnum": 4538,
"entities": [
{
"events": [
{
"eventAction": "registration",
"eventDate": "2010-11-26T03:14:01Z"
},
{
"eventAction": "last changed",
"eventDate": "2026-05-25T09:07:47Z"
}
],
"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/autnum/4538"
}
],
"objectClassName": "entity",
"remarks": [
{
"description": [
"timezone GMT+8",
"[email protected] was validated on 2026-03-05"
],
"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": "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/autnum/4538"
}
],
"objectClassName": "entity",
"remarks": [
{
"description": [
"[email protected]"
],
"title": "remarks"
}
],
"roles": [
"technical",
"administrative"
],
"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": "2008-09-04T06:40:34Z"
},
{
"eventAction": "last changed",
"eventDate": "2025-10-31T08:14:57Z"
}
],
"handle": "AS4538",
"links": [
{
"href": "https://rdap.apnic.net/autnum/4538",
"rel": "self",
"type": "application/rdap+json",
"value": "https://rdap.apnic.net/autnum/4538"
}
],
"name": "ERX-CERNET-BKB",
"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/autnum/4538"
}
],
"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/autnum/4538"
}
],
"title": "Whois Inaccuracy Reporting"
}
],
"objectClassName": "autnum",
"port43": "whois.apnic.net",
"rdapConformance": [
"history_version_0",
"nro_rdap_profile_0",
"nro_rdap_profile_asn_hierarchical_0",
"cidr0",
"rdap_level_0"
],
"remarks": [
{
"description": [
"China Education and Research Network Center",
"Tsinghua University",
"Beijing 100084"
],
"title": "description"
},
{
"description": [
"This aut-num object created as part of",
"the ER-Transfer from ARIN"
],
"title": "remarks"
}
],
"startAutnum": 4538,
"status": [
"active"
]
}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.