.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% 39ms 136ms 352
7d 100% 100% 41ms 179ms 1816
30d 100% 100% 33ms 220ms 10488

RDAP

Period Availability RTT Compliance RTT p50 RTT p95 Checks TSLAC
24h 100% 100% 356ms 490ms 40
7d 100% 100% 387ms 520ms 236
30d 100% 99.92% 376ms 508ms 1308

EPP *

Period Availability RTT Compliance RTT p50 RTT p95 Checks TSLAC
24h 100% 100% 43ms 47ms 22
7d 100% 100% 44ms 47ms 118
30d 100% 100% 44ms 47ms 670

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 104ms 44
7d 100% 39ms 110ms 236
30d 99.77% 38ms 104ms 1310

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 1.2ms 42 minutes ago local NSID: u-ci-nominet1.uschi1. OK
DNS v6 1.5ms 60 days, 3 hours ago local NSID: u-ci-nominet2.uschi1. OK
DNSSEC v4 38ms 1 hour, 9 minutes ago local Key: 43876 OK
DNSSEC v6 130ms 1 hour, 9 minutes ago local Key: 43876 OK
EPP * v4 45ms 18 minutes ago local Tudor EPP (Mock) v2.0 OK
EPP * v6 42ms 18 minutes ago local Tudor EPP (Mock) v2.0 OK
RDAP v4 280ms 1 minute ago local TLS 1.3 OK
RDAP v6 479ms 55 seconds ago local TLS 1.3 OK

RDAP HTTPS Timing

479ms total
DNS Lookup
199ms
TCP Connect
84ms
TLS Handshake
98ms
Time to First Byte
478ms

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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