.cn SLA Compliance

TLD SLA Compliance Metrics

Spec 10

DNS

Period	Availability	RTT Compliance	RTT p50	RTT p95	Checks
24h	100%	100%	137ms	250ms	264
7d	100%	100%	136ms	273ms	1440
30d	100%	100%	150ms	595ms	4872

WHOIS

Period	Availability	RTT Compliance	RTT p50	RTT p95	Checks
24h	95.83%	95.83%	434ms	998ms	24
7d	96.67%	98.33%	430ms	895ms	120
30d	96.53%	97.77%	437ms	774ms	404

DNSSEC Validation Metrics

Registry Agreement Spec 6

DNSSEC is required by the Registry Agreement (Specification 6) but is not part of the Spec 10 SLA. We monitor DNSSEC validation independently.

Period	Validation Rate	RTT p50	RTT p95	Checks
24h	100%	19ms	232ms	44
7d	98.75%	19ms	392ms	240
30d	99.51%	19ms	301ms	812

Unlike Spec 10 services, DNSSEC has no formal availability SLA. Thresholds shown are operational guidelines.

Current Check Status

Reported by Any53 Probes

Type	AF	RTT	Last Check	Source	Details	Status
`DNS`	v4	200ms	2 minutes ago	local	—	OK
`DNS`	v6	103ms	160 days, 1 hour ago	local	—	OK
`DNSSEC`	v4	227ms	5 minutes ago	local	Key: 33094	OK
`DNSSEC`	v6	19ms	5 minutes ago	local	Key: 33094	OK
`WHOIS`	v4	426ms	3 hours, 48 minutes ago	local	—	OK
`WHOIS`	v6	1550ms	3 hours, 48 minutes ago	local	—	OK

Nameservers

6 IPs tested

Hostname	IP Address	AF	ASN	RPKI
`a.dns.cn`	`203.119.25.1`	v4	AS24151
`b.dns.cn`	`203.119.26.1`	v4	AS24406
`c.dns.cn`	`203.119.27.1`	v4	AS24406
`d.dns.cn`	`203.119.28.1`	v4	AS24151
`e.dns.cn`	`203.119.29.1`	v4	—	—
`ns.cernet.net`	`202.112.0.44`	v4	—	—

Per ICANN Spec 10, we test all delegated nameserver IPs independently.

Test With Your Computer

DNS

dig @a.dns.cn cn. SOA +dnssec +nsid Query SOA with DNSSEC validation and NSID

drill -D cn. SOA @a.dns.cn Alternative using drill with DNSSEC trace

WHOIS

whois -h whois.cnnic.cn nic.cn Query WHOIS server directly

echo "nic.cn" | nc whois.cnnic.cn 43 Raw TCP query (see exact response)

Registry Information

Active

TLD .cn

Operator China

WHOIS Server whois.cnnic.cn

ICANN SLA Requirements

Per ICANN Registry Agreement Specification 10:

DNS SLA UDP RTT ≤ 500ms for 95% of queries. Availability: 99% (max 432 min/month downtime).

WHOIS SLA RTT ≤ 4000ms for 95% of queries. Availability: 98% (max 864 min/month downtime).

API Access

JSON API

Access .cn compliance metrics programmatically via our REST API.

Quick Start

GET /any53/api/v1/compliance/cn/

curl -H "X-API-Key: ${YOUR_API_KEY}" \
  "https://www.any53.com/any53/api/v1/compliance/cn/"

Example Response

{
  "tld": "cn",
  "display_name": ".cn",
  "operator": "China",
  "updated_at": "2026-01-31T12:00:00Z",
  "dns": {
    "availability_24h": 99.99,
    "rtt_p50_ms": 12,
    "rtt_p95_ms": 42,
    "sla_threshold_ms": 500
  },
  "rdds": {
    "protocol": "WHOIS",
    "availability_24h": 99.95,
    "rtt_p50_ms": 180,
    "rtt_p95_ms": 412,
    "sla_threshold_ms": 4000
  },
  "servers": {
    "whois_host": "whois.cnnic.cn"
  },
  "spec10_compliant": true
}

Generate API Key

Get a free API key to start making requests. Provide an email to upgrade to the verified tier (600 requests/hour).

Endpoints

Endpoint	Description	Tier
`GET /compliance/`	List all monitored TLDs	All
`GET /compliance/{tld}/`	Current metrics for a TLD	All
`GET /compliance/{tld}/history/`	Historical time-series data	Organization
`GET /compliance/{tld}/probes/`	Per-probe breakdown	Organization
`POST /compliance/keys/`	Generate a new API key	No auth

Rate Limits

Tier	Rate Limit	Features
Anonymous	100/hour	Current snapshot, hourly aggregates
Verified	600/hour	Current snapshot, hourly aggregates
Organization	6000/hour	Historical data, per-minute resolution, per-probe breakdown