.us

TLD SLA Compliance Monitoring

TLD SLA Compliance Metrics

Spec 10

DNS

Period Availability RTT Compliance RTT p50 RTT p95 Checks TSLAC
24h 100% 100% 5.0ms 238ms 144
7d 100% 100% 5.0ms 290ms 1776
30d 91.56% 91.56% 5.0ms 290ms 2294

WHOIS

Period Availability RTT Compliance RTT p50 RTT p95 Checks TSLAC
24h 100% 100% 49ms 256ms 12
7d 100% 100% 44ms 187ms 184
30d 95.00% 95.00% 45ms 175ms 280

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% 19ms 19ms 8
7d 100% 19ms 19ms 118
30d 100% 19ms 19ms 166

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 1 minute ago local NSID: dns2.uschi1 OK
DNS v6 1.6ms 1 minute ago local NSID: dns4.uschi1 OK
DNSSEC v4 20ms 17 hours, 15 minutes ago local Key: 59017 OK
DNSSEC v6 20ms 17 hours, 15 minutes ago local Key: 59017 OK
WHOIS v4 39ms 18 hours, 36 minutes ago local — OK
WHOIS v6 46ms 18 hours, 36 minutes ago local — OK

Nameservers

16 IPs tested
Hostname IP Address AF Status
b.cctld.us 156.154.125.70 v4
b.cctld.us 2001:502:ad09::29 v6
f.cctld.us 209.173.58.70 v4
f.cctld.us 2001:500:3682::11 v6
k.cctld.us 156.154.128.70 v4
k.cctld.us 2001:503:e239::3:1 v6
m.cctld.us 204.74.105.1 v4
m.cctld.us 2610:a1:3180::53 v6
n.cctld.us 204.74.107.1 v4
n.cctld.us 2610:a1:3280::53 v6
w.cctld.us 37.209.192.15 v4
w.cctld.us 2001:dcd:1::15 v6
x.cctld.us 37.209.194.15 v4
x.cctld.us 2001:dcd:2::15 v6
y.cctld.us 37.209.196.15 v4
y.cctld.us 2001:dcd:3::15 v6

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

Test With Your Computer

DNS

dig @b.cctld.us us. SOA +dnssec +nsid Query SOA with DNSSEC validation and NSID
drill -D us. SOA @b.cctld.us Alternative using drill with DNSSEC trace

WHOIS

whois -h whois.nic.us nic.us Query WHOIS server directly
echo "nic.us" | nc whois.nic.us 43 Raw TCP query (see exact response)

Registry Information

Active
TLD .us
Operator United States
WHOIS Server whois.nic.us

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).
WHOIS SLA RTT ≤ 4000ms for 95% of queries. Availability: 98% (max 864 min/month downtime).

API Access

JSON API

Access .us compliance metrics programmatically via our REST API.

Quick Start

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

Example Response

{
  "tld": "us",
  "display_name": ".us",
  "operator": "United States",
  "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": "WHOIS",
    "availability_24h": 99.95,
    "rtt_p50_ms": 180,
    "rtt_p95_ms": 412,
    "sla_threshold_ms": 4000
  },
  "servers": {
    "whois_host": "whois.nic.us"
  },
  "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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