Lowest Latency LRN

LRN Lookups at Sub-10ms P99.

NPAC-direct distributed U.S. infrastructure with Redis caching. The fastest LRN dip service in production. Benchmark us before you decide — no credit card required.

Test Our Latency FreeView Comparisons
3ms
P50 Latency
<10ms
P99 Latency
U.S.
Distributed
curl -w '%{time_total}' api.sipsmart.io/v1/lrn/test
DNS: 0.001s  Connect: 0.002s
TLS: 0.003s  Server: 0.003s
✓ Total: 0.008s (8ms)
✓ P99 SLA: <10ms ✓ MET

Infrastructure-Grade

Why Our Latency is Lower

Not marketing. Architecture.

⚡

Sub-10ms P99 Guarantee

Distributed U.S. replication delivers sub-10ms P99 response times nationwide. We publish latency benchmarks and you can test before committing.

🌐

Geographically Optimized

Nationally distributed replication endpoints ensure minimal network hop count regardless of where your traffic originates — reducing physical distance overhead.

🏗

In-Memory Primary Path

Hot numbers served directly from Redis memory pool. Cold path hits our SSD-backed NPAC replica with single-digit millisecond disk latency.

📊

Published Benchmarks

We don't hide our latency numbers. P50, P95, P99, and P999 metrics are published monthly and available for verification.

🔬

Latency Testing Tool

Run your own latency test before signing up. Our test endpoint returns full timing breakdown: DNS, connect, TLS, server processing, transfer.

🤖

No Cold Start Penalties

Our infrastructure is always hot. No lambda cold starts, no container spin-up delays — consistent latency from first request to millionth.

Start Free — 1,000 Lookups Included

Latency Comparison

How We Compare

* Competitor figures are market estimates based on published data and customer reports. Verify independently.

ServiceP50 LatencyP99 LatencyData Source
SIPSmart (Distributed U.S.)You're here3ms<10msNPAC Direct
Typical Reseller A45ms120ms3rd Party
Typical Reseller B30ms90ms3rd Party
Legacy SS7 Gateway80ms200msSS7 Bridge

Developer-First

Simple REST API — No SDK Required

Request

POST https://api.sipsmart.io/v1/lrn/lookup
{
  "number": "+16145550037",
  "fields": ["lrn", "ocn", "spid", "rate_center", "lata"]
}

Response — <10ms

200 OK
{
  "number": "+16145550037",
  "lrn": "6145550037",
  "ocn": "6529",
  "spid": "6529A",
  "rate_center": "COLUMBUS",
  "lata": "330",
  "ported": true,
  "latency_ms": 7
}
cURLPythonNode.jsGoPHPRuby

Infrastructure

Multi-Region LRN Replication Infrastructure

Our LRN database is replicated across distributed U.S. regions to minimize lookup latency and maximize reliability. New regional endpoints are deployed dynamically based on customer demand, ensuring consistently low response times nationwide.

🌐

Distributed U.S. Endpoints

Replication nodes distributed across U.S. regions to serve nationally distributed traffic without cross-country latency penalties.

🧠

Intelligent Regional Routing

Requests are automatically routed to the nearest available replication node. Your queries never travel farther than necessary.

🔄

Automatic Failover

If a regional node becomes unavailable, queries instantly failover to the next nearest node. No manual intervention. No downtime.

📈

Horizontally Scalable

New replication nodes are provisioned based on geographic demand. As your traffic grows or spreads, the infrastructure scales with it.

⚡

Sub-10ms Target Response Time

Distributed architecture keeps query paths short. Sub-10ms response times across CONUS traffic patterns.

🔒

NPAC-Sourced at Every Node

All regional nodes replicate from NPAC-direct sources — not secondary resellers. Data freshness is consistent across all regions.

Learn more about our distributed infrastructure →

Simple, Predictable Pricing

No Surprises. Ever.

We charge less than legacy providers and publish our prices openly. No setup fees, no hidden costs, no annual lock-in required.

Starter
$0.0001
per lookup
  • ✓ Real-time LRN dip
  • ✓ Standard latency
  • ✓ HTTPS API
  • ✓ 1,000 free lookups
Best Value
Volume
$0.00005
per lookup (1M+/mo)
  • ✓ Real-time + batch
  • ✓ <10ms Ohio cluster
  • ✓ Dedicated endpoint
  • ✓ Priority SLA
Enterprise
Custom
flat-rate
  • ✓ DB replication
  • ✓ On-prem option
  • ✓ SLA guarantee
  • ✓ Dedicated support

🛡 Pricing Guarantee

We will match or beat any competitor's published price for equivalent LRN lookup volume. Contact us with a quote.

Get Started Free

FAQ

Low-Latency LRN FAQ

Have another question? Email us at support@sipsmart.io

  • Three factors: (1) NPAC-direct connection eliminates reseller chain hops, (2) distributed U.S. replication nodes reduce network path length from your infrastructure, (3) multi-tier Redis cache keeps hot numbers in-memory for microsecond response. Together these deliver consistent sub-10ms P99.
  • Yes. We provide a public test endpoint at api.sipsmart.io/v1/lrn/test that you can hit with any number before creating an account. Full timing headers are returned so you can measure real latency from your infrastructure.
  • For Enterprise accounts, we offer an SLA that includes P99 latency guarantees with service credits for violations. Standard accounts have best-effort latency targets with historical performance averaging well below 10ms P99.

Benchmark Us. Then Sign Up.

Public test endpoint. No account required. See the sub-10ms difference yourself.

Test Our Latency FreeView Pricing

1,000 free lookups included • No credit card required • Instant provisioning