.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% 41ms 91ms 320
7d 100% 100% 31ms 220ms 1896
30d 100% 100% 31ms 557ms 10440

RDAP

Period Availability RTT Compliance RTT p50 RTT p95 Checks TSLAC
24h 100% 100% 384ms 480ms 40
7d 100% 100% 362ms 479ms 240
30d 100% 99.77% 377ms 544ms 1308

EPP *

Period Availability RTT Compliance RTT p50 RTT p95 Checks TSLAC
24h 100% 100% 43ms 46ms 22
7d 100% 100% 43ms 48ms 120
30d 100% 100% 44ms 47ms 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 100% 48ms 103ms 44
7d 100% 37ms 103ms 240
30d 99.77% 38ms 107ms 1314

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 12ms 10 minutes ago local NSID: u-ci-nominet2.cator1. OK
DNS v6 1.5ms 55 days, 4 hours ago local NSID: u-ci-nominet2.uschi1. OK
DNSSEC v4 38ms 7 minutes ago local Key: 43876 OK
DNSSEC v6 102ms 7 minutes ago local Key: 43876 OK
EPP * v4 43ms 46 minutes ago local Tudor EPP (Mock) v2.0 OK
EPP * v6 44ms 46 minutes ago local Tudor EPP (Mock) v2.0 OK
RDAP v4 282ms 29 minutes ago local TLS 1.3 OK
RDAP v6 464ms 29 minutes ago local TLS 1.3 OK

RDAP HTTPS Timing

464ms total
DNS Lookup
183ms
TCP Connect
85ms
TLS Handshake
95ms
Time to First Byte
463ms

TLS 1.3 / TLS_AES_128_GCM_SHA256

Nameservers

8 IPs tested
Hostname IP Address AF ASN RPKI Status
dns1.nic.uk 213.248.216.1 v4 — —
dns2.nic.uk 103.49.80.1 v4 — —
dns3.nic.uk 213.248.220.1 v4 — —
dns4.nic.uk 43.230.48.1 v4 — —
nsa.nic.uk 156.154.100.3 v4 AS12008
nsb.nic.uk 156.154.101.3 v4 AS12008
nsc.nic.uk 156.154.102.3 v4 AS12008
nsd.nic.uk 156.154.103.3 v4 AS12008

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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