Carrier LookupFind the Carrier for Any Number
Look up the current carrier, line type, and porting history behind any phone number. Real-time, MNP-aware carrier data for US, Canadian and international numbers, built for routing, fraud prevention, and clean contact records.
US + Intl
Numbers Covered
OCN + LRN
US Routing Data
7 days
Result Caching
Try it free first: Free Carrier Lookup
Find the carrier and network behind any phone number. No signup needed.
To check first whether a number is valid, use the phone number validator. To see only whether a number is a mobile, a landline or VoIP, use the free VoIP checker. To see whether a mobile number has moved to another network, use the free MNP checker. To see whether a mobile number is switched on and reachable right now, use the free HLR lookup.
Carrier Intelligence
See the carrier, line type, and porting history behind any phone number
Global Carrier Identification
Identify the current carrier for US, Canadian and international phone numbers. US and Canadian numbers also return the OCN and LRN from the carrier record, with support for major and regional carriers.
Advanced Network Type Detection
Line type classification covering mobile, landline, VoIP, toll-free and premium rate numbers. Essential for routing optimization and compliance management.
Mobile Number Portability Intelligence
MNP data including porting history, original carrier, current carrier, porting timestamps, and carrier migration patterns. Critical for accurate routing and billing.
Geographic & Regulatory Intelligence
Detailed geographic information including country, region, timezone, and regulatory data. Essential for compliance with local regulations and optimized service delivery.
Carrier Intelligence Use Cases
Real-world applications for telecommunications optimization and fraud prevention
Telecom Routing & Optimization
Optimize call routing decisions based on accurate carrier information. Reduce costs and improve call quality with intelligent routing algorithms.
Fraud Prevention & Security
Identify suspicious number patterns and prevent telecommunications fraud. Detect premium rate scams and unauthorized network usage.
Customer Verification & Onboarding
Verify customer phone numbers and carrier information during registration. Ensure accurate billing and improve customer data quality.
Enterprise Communications
Optimize enterprise communication systems with accurate carrier data. Improve internal routing and reduce telecommunications costs.
Carrier Intelligence Market Insights
Industry research on telecommunications and mobile network operations
Global Telecom Market
The global telecommunications market reached $1.8 trillion in 2024, serving over 6.8 billion mobile subscribers worldwide across 15,000+ carriers.
Number Portability & Routing
FCC data shows 47 million numbers ported annually in the US alone.
Carrier Intelligence Business Value
US + Intl
Numbers Covered
OCN + LRN
On US and Canadian Numbers
From 1 credit
Per Lookup
Every lookup returns the carrier and line type, and US and Canadian numbers add the OCN, LRN and porting status from the carrier record.
Simple Carrier Lookup Integration
Get carrier, line type, and porting data with a single API call
// Carrier lookup with network intelligence
const response = await fetch('https://app.1lookup.io/api/v1/phone', {
method: 'POST',
headers: {
'Authorization': 'Bearer YOUR_API_KEY',
'Content-Type': 'application/json'
},
body: JSON.stringify({
phone_number: '+14155552671'
})
})
// Response
{
"success": true,
"data": {
"request": {
"type": "phone",
"input": "+14155552671"
},
"classification": {
"line_type": "MOBILE",
"carrier_type": "MAJOR_CARRIER",
"number_status": "ACTIVE",
"portability_status": "NOT_PORTED"
},
"insights": {
"location": { "timezone": "America/Los_Angeles" },
"routing": {
"lrn": "4155552671",
"is_ported": false
},
"raw_api_fields": {
"network": "T-MOBILE USA, INC.",
"ocn": "6529",
"state": "CA"
}
},
"metadata": {
"credits_used": 1,
"credits_remaining": 9998
}
}
}Technical Specifications
Coverage
US, Canada + international
Routing Data
OCN + LRN (US, Canada)
Result Caching
7 days
Cost per Lookup
1 credit
Carrier Lookup FAQ
Common questions about looking up the carrier behind a phone number
How do I look up the carrier for a phone number?
Enter the phone number in international (E.164) format — for example +14155552671 — into the carrier lookup and it returns the current carrier, line type, and country in real time. For one-off checks use the free carrier lookup tool; for bulk or programmatic checks call the Carrier Lookup API with a single request per number.
What carrier is this number on?
The lookup identifies the carrier a number is currently registered to, not just the original network it was issued by. Because numbers get ported between carriers, we resolve the live carrier using mobile number portability (MNP) data so you see who actually serves the number today.
Is the carrier lookup free?
Yes — the free carrier lookup tool lets you check individual numbers with no signup. If you need to look up carriers at scale or inside your own product, the Carrier Lookup API includes a 7-day free trial and then runs on pay-as-you-go universal credits.
Can it detect the carrier of a ported number?
Yes. Ported numbers are exactly where prefix-based free tools go wrong. We return both the current carrier (after porting) and the original carrier, along with porting status and timestamps, so routing and billing decisions use the real network.
Does carrier lookup work for mobile and landline numbers?
It does. Each result includes a line-type classification (mobile, landline, VoIP, toll-free or premium rate), so you can tell a cell phone from a landline or a VoIP number before you call or text.
Which countries and carriers are supported?
Carrier lookup covers US and Canadian numbers from the carrier record, including OCN, LRN and porting status, and numbers from other countries through an international number-type lookup that returns the carrier, line type and country.
What data does the carrier lookup API return?
A typical response includes carrier name and code (OCN/MCC/MNC), line type, ported status, original carrier, and geographic detail such as country, region, and timezone. See the API docs for the full response schema.
Related Lookups
Explore the rest of the 1Lookup phone intelligence suite
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