.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% 64ms 99ms 72
7d 100% 100% 65ms 236ms 1240
30d 93.75% 93.75% 65ms 236ms 1715

RDAP

Period Availability RTT Compliance RTT p50 RTT p95 Checks TSLAC
24h 100% 100% 436ms 503ms 12
7d 100% 99.52% 426ms 662ms 208
30d 100% 99.66% 427ms 719ms 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% 58ms 117ms 10
7d 100% 58ms 149ms 190
30d 100% 58ms 160ms 250

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 1 hour, 43 minutes ago local NSID: dns-linx-dns03.nic.cz OK
DNS v6 40ms 1 hour, 43 minutes ago local NSID: dns-sixusa-dns02.nic.cz OK
DNSSEC v4 117ms 43 minutes ago local Key: 20237 OK
DNSSEC v6 58ms 43 minutes ago local Key: 20237 OK
RDAP v4 451ms 2 hours, 3 minutes ago local TLS 1.3 OK
RDAP v6 404ms 2 hours, 3 minutes ago local TLS 1.3 OK

RDAP HTTPS Timing

404ms total
DNS Lookup
—
TCP Connect
100ms
TLS Handshake
109ms
Time to First Byte
403ms

TLS 1.3 / TLS_AES_128_GCM_SHA256

Nameservers

8 IPs tested
Hostname IP Address AF Status
a.ns.nic.cz 194.0.12.1 v4
a.ns.nic.cz 2001:678:f::1 v6
b.ns.nic.cz 194.0.13.1 v4
b.ns.nic.cz 2001:678:10::1 v6
c.ns.nic.cz 194.0.14.1 v4
c.ns.nic.cz 2001:678:11::1 v6
d.ns.nic.cz 193.29.206.1 v4
d.ns.nic.cz 2001:678:1::1 v6

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

Enter a TLD name or IDN code • Browse all TLDs