HLR-based real-time data
Query network-backed carrier information for current routing and reachability context.
Carrier Lookup API · Real-time HLR · MNP tracking
Carrier Lookup API — Real-time Network Detection
Detect carrier, line type, country, region, ported-number status, and routing context in real time with the bulkchecker.io Carrier Lookup API.
Detection
HLR-based data
Routing
MNP aware
Scale
Bulk endpoint
GET /v1/carrier
curl "https://api.bulkchecker.io/v1/carrier?phone=+14155550198" \
-H "Authorization: Bearer YOUR_API_KEY"Response preview
carrierT-Mobile USA
line_typemobile
portedfalse
countryUS
Network intelligence
API Features
Use carrier intelligence to route messages, validate users, enrich CRM data, and reduce risky phone activity.
MNP (ported number) tracking
Detect numbers that moved between carriers so your routing follows the current network.
Line type intelligence
Identify mobile, landline, VoIP, toll-free, and unknown line types for routing and risk rules.
Country/region detection
Resolve country, region, and dialing context for segmentation and international workflows.
Fast integration
Quick Start
Create a key, make your first carrier lookup, and use the JSON response in routing, validation, and fraud workflows.
Get API key
Create a bulkchecker.io project, generate a server-side API key, and set limits for your environment.
First curl request
curl "https://api.bulkchecker.io/v1/carrier?phone=+14155550198" \
-H "Authorization: Bearer YOUR_API_KEY"Sample JSON response
{
"phone": "+14155550198",
"carrier": "T-Mobile USA",
"line_type": "mobile",
"country_code": "US",
"region": "California",
"ported": false,
"status": "active",
"mcc": "310",
"mnc": "260",
"lookup_id": "clu_7f91c2"
}Reference
Endpoints
Use single-number lookup for real-time decisions and bulk lookup for campaign or CRM workflows.
GET
GET /v1/carrier
Lookup carrier data for one phone number in real time. Best for forms, routing decisions, and user validation.
POST
POST /v1/carrier/bulk
Submit large batches for carrier, line type, MNP, country, and status enrichment.
Developer libraries
SDKs (Python/Node/Ruby/PHP)
Integrate carrier lookup with official-style SDK patterns and simple server-side requests.
Python
pip install bulkchecker
Node
npm i bulkchecker
Ruby
gem install bulkchecker
PHP
composer require bulkchecker/sdk
Volume pricing
Pricing Tiers
Start small, then move to lower per-lookup rates as your carrier lookup volume grows.
| Tier | Monthly volume | Price | Best for |
|---|---|---|---|
| Starter | 10K lookups | $5 | Testing and small apps |
| Growth | 100K lookups | $40 | Forms, routing, and recurring jobs |
| Scale | 1M+ lookups | Custom | SMS gateways and high-volume systems |
Workflows
Use Cases
Carrier lookup API results are most useful when they power live routing, validation, and risk decisions.
SMS gateway routing
Route messages through the right carrier path and suppress numbers that should not receive SMS.
Real-time form validation
Check country, line type, and carrier signals before accepting a signup or lead form.
Fraud detection systems
Flag risky VoIP, ported, unknown, or mismatched phone records inside fraud scoring pipelines.
Alternative
Compare with Twilio Lookup API
Twilio Lookup is strong for teams already deep in the Twilio ecosystem. bulkchecker.io focuses on carrier lookup plus bulk workflows, routing signals, and high-volume pricing.
Read Twilio alternative| Category | bulkchecker.io | Twilio Lookup API |
|---|---|---|
| Carrier lookup | Real-time API and bulk endpoint | Lookup API |
| Bulk workflow | Native POST /v1/carrier/bulk | Requires custom batching |
| Best fit | SMS routing, fraud, CRM enrichment | Existing Twilio stack users |
FAQ
Carrier Lookup API FAQ
Short answers for developers evaluating carrier lookup integration.
API rate limits?
Rate limits depend on plan and traffic profile. Higher tiers can request increased throughput for real-time routing and bulk processing.
SLA guarantees?
SLA options are available for production and enterprise customers that need uptime commitments and support coverage.
Can I get carrier data offline?
Yes. Use the bulk endpoint or CSV workflow when you need offline enrichment for campaigns, CRM exports, or data warehouse jobs.
Webhook support?
Webhook notifications are supported for bulk jobs so systems can be notified when carrier lookup exports are ready.
How is this rated against the best carrier lookup API?
Independent reviewers rank bulkchecker.io among the best carrier lookup API options for price-per-lookup, post-MNP accuracy, and bulk batch endpoints. Free tier available for testing.