.london SLA Compliance

TLD SLA Compliance Metrics

Spec 10

DNS

Period	Availability	RTT Compliance	RTT p50	RTT p95	Checks
24h	100%	100%	30ms	65ms	352
7d	99.58%	99.58%	28ms	45ms	1920
30d	99.92%	99.92%	28ms	119ms	10648

RDAP

Period	Availability	RTT Compliance	RTT p50	RTT p95	Checks
24h	100%	100%	408ms	794ms	60
7d	100%	100%	404ms	461ms	360
30d	99.90%	99.85%	405ms	524ms	2016

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
24h	100%	57ms	61ms	66
7d	100%	53ms	58ms	360
30d	99.90%	53ms	57ms	1986

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
`DNS`	v4	18ms	9 minutes ago	local	NSID: WVQS-AQ5DSO-L6ZRS7	OK
`DNS`	v6	19ms	57 days, 16 hours ago	local	NSID: WVQS-AQ5DSO-L6ZRS7	OK
`DNSSEC`	v4	56ms	18 minutes ago	local	Key: 17464	OK
`DNSSEC`	v6	53ms	18 minutes ago	local	Key: 17464	OK
`RDAP`	v4	405ms	40 minutes ago	local	TLS 1.2	OK
`RDAP`	v6	394ms	40 minutes ago	local	TLS 1.2	OK

RDAP HTTPS Timing

394ms total

DNS Lookup

—

TCP Connect

94ms

TLS Handshake

191ms

Time to First Byte

394ms

TLS 1.2 / TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256

Nameservers

4 IPs tested

Hostname	IP Address	AF	ASN	RPKI
`a.nic.london`	`194.169.218.141`	v4	—	—
`b.nic.london`	`185.24.64.141`	v4	—	—
`c.nic.london`	`212.18.248.141`	v4	—	—
`d.nic.london`	`212.18.249.141`	v4	—	—

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

Test With Your Computer

DNS

dig @a.nic.london london. SOA +dnssec +nsid Query SOA with DNSSEC validation and NSID

drill -D london. SOA @a.nic.london Alternative using drill with DNSSEC trace

RDAP

curl -sS "https://rdap.centralnic.com/london/domain/nic.london" | jq . Fetch RDAP JSON (positive lookup)

curl -I -sS "https://rdap.centralnic.com/london/domain/nic.london" Headers only (check TLS, timing)

Open in Browser View RDAP response directly

Registry Information

Active

TLD .london

Operator Dot London Domains Limited

RDAP Server https://rdap.centralnic.com/london/ 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 .london compliance metrics programmatically via our REST API.

Quick Start

GET /any53/api/v1/compliance/london/

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

Example Response

{
  "tld": "london",
  "display_name": ".london",
  "operator": "Dot London Domains Limited",
  "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.centralnic.com/london/"
  },
  "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