.cn

TLD SLA Compliance Monitoring

TLD SLA Compliance Metrics

Spec 10

DNS

Period Availability RTT Compliance RTT p50 RTT p95 Checks TSLAC
24h 100% 100% 48ms 229ms 132
7d 100% 100% 47ms 278ms 2145
30d 94.49% 94.49% 50ms 278ms 2864

WHOIS

Period Availability RTT Compliance RTT p50 RTT p95 Checks TSLAC
24h 93.75% 100% 441ms 958ms 16
7d 98.64% 99.55% 448ms 894ms 220
30d 98.63% 99.66% 461ms 901ms 292

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 Status
24h 100% 19ms 241ms 8
7d 98.21% 23ms 396ms 112
30d 98.30% 24ms 397ms 176

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 TSLAC
DNS v4 222ms 15 hours, 3 minutes ago local — OK
DNS v6 104ms 15 hours, 3 minutes ago local — OK
DNSSEC v4 239ms 18 hours, 17 minutes ago local Key: 33094 OK
DNSSEC v6 19ms 18 hours, 17 minutes ago local Key: 33094 OK
WHOIS v4 427ms 28 minutes ago local — OK
WHOIS v6 438ms 28 minutes ago local — OK

Nameservers

11 IPs tested
Hostname IP Address AF Status
a.dns.cn 203.119.25.1 v4
a.dns.cn 2001:dc7::1 v6
b.dns.cn 203.119.26.1 v4
b.dns.cn 2001:dc7:1::1 v6
c.dns.cn 203.119.27.1 v4
c.dns.cn 2001:dc7:2::1 v6
d.dns.cn 203.119.28.1 v4
d.dns.cn 2001:dc7:1000::1 v6
e.dns.cn 203.119.29.1 v4
e.dns.cn 2001:dc7:3::1 v6
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

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