.uk

TLD SLA Compliance Monitoring

TLD SLA Compliance Metrics

Spec 10

DNS

Period Availability RTT Compliance RTT p50 RTT p95 Checks TSLAC
24h 100% 100% 19ms 92ms 80
7d 100% 100% 19ms 137ms 816
30d 91.21% 91.21% 19ms 137ms 1360

RDAP

Period Availability RTT Compliance RTT p50 RTT p95 Checks TSLAC
24h No data available
7d 100% 100% 281ms 417ms 100
30d 100% 100% 282ms 411ms 144

EPP *

Period Availability RTT Compliance RTT p50 RTT p95 Checks TSLAC
24h 100% 100% 41ms 46ms 8
7d 100% 100% 43ms 47ms 110
30d 98.48% 98.48% 36ms 40ms 132

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% 37ms 102ms 6
7d 99.23% 38ms 170ms 130
30d 98.99% 38ms 187ms 198

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 1.6ms 3 hours, 13 minutes ago local NSID: u-ci-nominet1.uschi1. OK
DNS v6 2.9ms 3 hours, 13 minutes ago local NSID: u-ci-nominet1.uschi1. OK
DNSSEC v4 38ms 1 hour, 57 minutes ago local Key: 43876 OK
DNSSEC v6 102ms 1 hour, 57 minutes ago local Key: 43876 OK
EPP * v4 43ms 3 hours, 2 minutes ago local Tudor EPP (Mock) v2.0 OK
EPP * v6 48ms 3 hours, 2 minutes ago local Tudor EPP (Mock) v2.0 OK
RDAP v4 286ms 1 day ago local TLS 1.3 OK
RDAP v6 277ms 1 day ago local TLS 1.3 OK

RDAP HTTPS Timing

277ms total
DNS Lookup
—
TCP Connect
83ms
TLS Handshake
92ms
Time to First Byte
276ms

TLS 1.3 / TLS_AES_128_GCM_SHA256

Nameservers

16 IPs tested
Hostname IP Address AF Status
dns1.nic.uk 213.248.216.1 v4
dns1.nic.uk 2a01:618:400::1 v6
dns2.nic.uk 103.49.80.1 v4
dns2.nic.uk 2401:fd80:400::1 v6
dns3.nic.uk 213.248.220.1 v4
dns3.nic.uk 2a01:618:404::1 v6
dns4.nic.uk 43.230.48.1 v4
dns4.nic.uk 2401:fd80:404::1 v6
nsa.nic.uk 156.154.100.3 v4
nsa.nic.uk 2001:502:ad09::3 v6
nsb.nic.uk 156.154.101.3 v4
nsb.nic.uk 2001:502:2eda::3 v6
nsc.nic.uk 156.154.102.3 v4
nsc.nic.uk 2610:a1:1009::3 v6
nsd.nic.uk 156.154.103.3 v4
nsd.nic.uk 2610:a1:1010::3 v6

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

Test With Your Computer

DNS

dig @dns1.nic.uk uk. SOA +dnssec +nsid Query SOA with DNSSEC validation and NSID
drill -D uk. SOA @dns1.nic.uk Alternative using drill with DNSSEC trace

RDAP

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

Registry Information

Active
TLD .uk
Operator United Kingdom
RDAP Server https://rdap.nominet.uk/uk/ 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).
EPP SLA RTT ≤ 4000ms for 95% of commands (Spec 10 §5). Availability: 98% (max 864 min/month downtime). (Demo mode)

API Access

JSON API

Access .uk compliance metrics programmatically via our REST API.

Quick Start

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

Example Response

{
  "tld": "uk",
  "display_name": ".uk",
  "operator": "United Kingdom",
  "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.nominet.uk/uk/",
    "whois_host": "whois.nic.uk"
  },
  "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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