.cz

TLD SLA Compliance Monitoring

TLD SLA Compliance Metrics

Spec 10

DNS

Period Availability RTT Compliance RTT p50 RTT p95 Checks TSLAC
24h 100% 100% 76ms 109ms 176
7d 99.17% 99.17% 75ms 105ms 960
30d 99.75% 99.75% 76ms 164ms 3248

RDAP

Period Availability RTT Compliance RTT p50 RTT p95 Checks TSLAC
24h 100% 100% 437ms 582ms 40
7d 100% 99.58% 428ms 909ms 240
30d 100% 99.88% 436ms 664ms 824

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% 91ms 119ms 22
7d 98.33% 92ms 281ms 120
30d 98.28% 74ms 261ms 408

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 85ms 21 minutes ago local NSID: dns-linx-dns01.nic.cz OK
DNS v6 40ms 160 days, 13 hours ago local NSID: dns-sixusa-dns01.nic.cz OK
DNSSEC v4 117ms 22 minutes ago local Key: 20237 OK
DNSSEC v6 89ms 22 minutes ago local Key: 20237 OK
RDAP v4 416ms 1 hour, 25 minutes ago local TLS 1.3 OK
RDAP v6 433ms 1 hour, 25 minutes ago local TLS 1.3 OK

RDAP HTTPS Timing

433ms total
DNS Lookup
—
TCP Connect
102ms
TLS Handshake
124ms
Time to First Byte
433ms

TLS 1.3 / TLS_AES_128_GCM_SHA256

Nameservers

4 IPs tested
Hostname IP Address AF ASN RPKI Status
a.ns.nic.cz 194.0.12.1 v4 AS25192
b.ns.nic.cz 194.0.13.1 v4 AS25192
c.ns.nic.cz 194.0.14.1 v4 AS200070
d.ns.nic.cz 193.29.206.1 v4 AS25192

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

Test With Your Computer

DNS

dig @a.ns.nic.cz cz. SOA +dnssec +nsid Query SOA with DNSSEC validation and NSID
drill -D cz. SOA @a.ns.nic.cz Alternative using drill with DNSSEC trace

RDAP

curl -sS "https://rdap.nic.cz/domain/nic.cz" | jq . Fetch RDAP JSON (positive lookup)
curl -I -sS "https://rdap.nic.cz/domain/nic.cz" Headers only (check TLS, timing)
Open in Browser View RDAP response directly

Registry Information

Active
TLD .cz
Operator Czech Republic
RDAP Server https://rdap.nic.cz/ RDAP Client

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

API Access

JSON API

Access .cz compliance metrics programmatically via our REST API.

Quick Start

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

Example Response

{
  "tld": "cz",
  "display_name": ".cz",
  "operator": "Czech Republic",
  "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": "RDAP",
    "availability_24h": 99.95,
    "rtt_p50_ms": 180,
    "rtt_p95_ms": 412,
    "sla_threshold_ms": 4000
  },
  "servers": {
    "rdap_url": "https://rdap.nic.cz/",
    "whois_host": "whois.nic.cz"
  },
  "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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