.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% 144ms 288ms 252
7d 91.60% 91.60% 128ms 300ms 1428
30d 98.21% 98.21% 103ms 560ms 8052

WHOIS

Period Availability RTT Compliance RTT p50 RTT p95 Checks TSLAC
24h 100% 100% 431ms 445ms 20
7d 85.00% 86.67% 721ms 1451ms 120
30d 94.94% 96.58% 488ms 855ms 672

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 97.73% 19ms 673ms 44
7d 95.58% 22ms 526ms 226
30d 98.64% 21ms 374ms 1328

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 190ms 18 minutes ago local — OK
DNS v6 103ms 205 days, 7 hours ago local — OK
DNSSEC v4 242ms 21 minutes ago local Key: 33094 OK
DNSSEC v6 19ms 21 minutes ago local Key: 33094 OK
WHOIS v4 440ms 2 hours, 4 minutes ago local — OK
WHOIS v6 437ms 2 hours, 4 minutes ago local — OK

Nameservers

6 IPs tested
Hostname IP Address AF ASN RPKI Status
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 AS24406
e.dns.cn 203.119.29.1 v4 AS24151
ns.cernet.net 202.112.0.44 v4 AS4538

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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