Find the original carrier behind a number, in real time

Submit one number and the same response returns its original allocation: carrier, line type, country and allocation region. Explore the fields before you integrate.

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Real-time carrier lookup

Illustrative sample · not a live lookup

Original carrierT-Mobile

Number: +12345678900
Number type: Fixed Line or Mobile
Country: US
Region: OH
City: AKRON

Where does one carrier lookup fit into real work?

The same number can raise different questions for sales operations, messaging, risk, and telecom data teams. Here is what this result can help each team do.

The fields teams actually receive

Add carrier, country, region, and line-type context to an existing record. Sales, messaging, and risk teams can use the same result to spot mismatches, prioritize review, and choose the next step.

From a fixed CarrierLookup test sample; unavailable fields are marked as not returned.

identifier: +12345678900
carrier: T-Mobile
underlying_carrier: Not returned
number_type: Fixed Line or Mobile
country_code: US
region: OH
city: AKRON

Four teams, four next steps

The same lookup fields can move four different teams forward once they become part of a working record. These are illustrative business workflows.

Give sales a more complete lead record

A campaign lead gives Canada in the form and leaves this phone number. Before handoff, the CRM needs the submitted details and number context on the same record.

Use the result
Keep Canada as the submitted country. Add T-Mobile, US, OH and AKRON to separate number-context fields so sales can decide how to route and approach the lead.
Record the next step
Save the lookup source and time with the handoff. Sales can clarify the market during first contact and update lead ownership without overwriting the customer’s answer.

Try a number View full scenario

Your working recordCRM lead · before handoff

Team record

Phone number: +12345678900
Form country: Canada

Lookup fields used here

Original carrier: T-Mobile
Allocation country: US
Region / city: OH · AKRON

Team next stepSales to review lead details

At handoff, sales compares the submitted Canada value with allocation country US, confirms the target market and owner, then keeps both values and the lookup time on the CRM lead before updating its assignment.

Lookup fields come from a real test sample. Existing team data and follow-up actions illustrate possible workflows.

Classify numbers before they enter a sending list

A notification list is about to enter a sending platform. This number returns “Fixed Line or Mobile”, so operations needs a clear next check before import.

Use the result
Mark the number “line type to review” in the import list, keep the returned value, and send it to a more specific line-type or SMS reachability check.
Record the next step
Record the owner and the follow-up result in the import job. Choose a sending list after the check; keep unresolved numbers in the review queue.

Try a number View full scenario

Your working recordNotification list · before import

Team record

Phone number: +12345678900
List purpose: Service notices

Lookup fields used here

Line type: Fixed Line or Mobile
Allocation country: US

Team next stepLine type to review

The import owner keeps this number in line-type review, assigns a dedicated check and records the outcome. Messaging operations moves it to the appropriate sending list only after the follow-up check.

Lookup fields come from a real test sample. Existing team data and follow-up actions illustrate possible workflows.

Add context to registration reviews

The signup form says Canada, but this number’s allocation country returns US. Reviewers need to see that difference on the signup record.

Use the result
Show submitted and allocation countries side by side, with original carrier, line type and region. Existing rules can compare that difference with device, IP and account history.
Record the next step
Send only records meeting existing rules to an extra check or human review. Save the trigger and outcome for later rule review.

Try a number View full scenario

Your working recordSignup record · rule review

Team record

Phone number: +12345678900
Signup country: Canada

Lookup fields used here

Allocation country: US
Original carrier: T-Mobile
Region / city: OH · AKRON

Team next stepRecord difference to review

A reviewer sees Canada beside US and considers device, IP and account history. Extra verification follows only when existing rules call for it; the trigger and outcome stay on the signup record.

Lookup fields come from a real test sample. Existing team data and follow-up actions illustrate possible workflows.

Turn numbers into useful reference data

An analyst spots a discrepancy in one number record and checks that number as a sample before deciding whether to inspect more numbers.

Use the result
Record T-Mobile, US, OH, AKRON and line type field by field for this sample, with original field names, source and lookup date.
Record the next step
Mark each field as matching or needing review. Expand the sample or update the reference after checking the data definition; one number does not represent the whole range.

Try a number View full scenario

Your working recordNumber reference · one sample

Team record

Phone number: +12345678900
Review scope: One number

Lookup fields used here

Original carrier: T-Mobile
Allocation country: US
Region / city: OH · AKRON
Line type: Fixed Line or Mobile

Team next stepSample fields to compare

The analyst compares T-Mobile, US, OH, AKRON and line type with the internal entry, marking differences and saving source and date. After checking definitions, they decide whether to sample more or update the reference.

Lookup fields come from a real test sample. Existing team data and follow-up actions illustrate possible workflows.

From record enrichment to task assignment, these fields help teams spot differences, record the evidence, and move the next review forward.

Explore detailed work examples

What a carrier lookup returns

Use the returned carrier, number type and location fields to organize phone records.

POST /api/v1/check200 OK

identifier

Number

+12345678900

The number as the API returns it, in E.164.

number_type

Number type

Fixed Line or Mobile

Line type as the provider reports it — for US numbers it is usually “Fixed Line or Mobile”, which does not separate the two.

country_code

Country code

Two-letter ISO country code.

carrier

Original carrier

T-Mobile

Carrier the number was originally allocated to. Not the current carrier after porting.

region

Region

Allocation region — a state or province code. Can be empty.

city

City

AKRON

Allocation city as the provider writes it; sometimes an exchange code rather than a place name. Never a live location.

An empty optional field does not make a lookup invalid.See field guidance →

A lookup is only useful when the next step is clear

See one number move from a team discussion into a record with carrier context.

The number is there. The carrier field is empty.

Maya’s team receives a phone list to organize. It contains numbers but little context for the handoff. She checks one number first and places its original carrier and country code beside it so a colleague can continue the review and grouping.

Verified lookup sample

phone: +12345678900
carrier: T-Mobile
country_code: US

What goes into the handoff?

Keep the original number, add carrier and country_code as separate columns, and note the lookup source. The next teammate can see T-Mobile and US before deciding which records need another check.

Read the full story

A new contact needs context

See how a new CRM lead can keep submitted details alongside the number’s carrier, country, and region.

Two country codes disagree

See how a signup country difference is recorded and passed to an existing review process.

How to call the real-time carrier lookup API

Review the single-number request and the typed response, then call the same endpoint with your own API key.

Original allocation only. No current-carrier, reachability or real-time location claim.

Read API documentation

curl "https://carrierlookup.online/api/v1/check" \
  -H "Authorization: Bearer YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"service_type":"carrier",
       "identifier":"+12345678900"}'

Carrier lookup pricing

Pay for what you check — no subscription required. One balance covers every check you run.

Permanent top-up

$19.90

Balance credited$19.90

Balance never expires. Use it across every product in your account.

See all plans →

30-day plans

$9.90

Balance credited$10.40

Same spend, more bonus balance. Renews every 30 days.

See all plans →

Recent carrier lookup guides

Practical articles on carrier lookups, API integration, and reading the allocation fields.

View all articles

CarrierLookup workflow illustration for Landline Carrier Lookup: Reading Fixed-Line Number Results

Verification workflowsNov 1, 2026Landline Carrier Lookup: Reading Fixed-Line Number ResultsLearn what an original carrier lookup may return for a fixed-line number, how to review allocation geography, and how to handle mixed mobile and landline lists.Read article

Verification workflowsNov 1, 2026MVNO Meaning: Brand Carriers, Host Networks and Lookup ResultsMVNO means mobile virtual network operator: a provider that offers mobile service through access to another operator's radio network. The provider.Read article

CarrierLookup workflow illustration for Carrier Lookup by IMEI vs by Phone Number: What Each One Tells You

Verification workflowsOct 31, 2026Carrier Lookup by IMEI vs by Phone Number: What Each One Tells YouA carrier lookup by IMEI and a carrier lookup by phone number start with different identifiers and answer different questions. An IMEI identifies cellular.Read article

CarrierLookup workflow illustration for Russia Phone Number Carrier Lookup for +7 Lists

Verification workflowsOct 30, 2026Russia Phone Number Carrier Lookup for +7 ListsLearn russia phone number carrier lookup with correct number formatting, original allocation context, and practical single or list-check workflows.Read article

CarrierLookup workflow illustration for Normalizing Phone Numbers to E.164 in BigQuery for Lookup

Verification workflowsOct 29, 2026Normalizing Phone Numbers to E.164 in BigQuery for LookupTo normalize phone numbers to E.164 in BigQuery before a carrier lookup, preserve the raw column, strip presentation characters in a working column, and adRead article

CarrierLookup workflow illustration for Why Prospect Phone Numbers from Contact Data Tools Are Inaccurate

Verification workflowsOct 29, 2026Why Prospect Phone Numbers from Contact Data Tools Are InaccurateInaccurate prospect phone numbers often reflect a data-handling problem before they reflect anything about the person: missing country context, malformed fRead article

Carrier lookup FAQ

Answers on carrier data, balance, API access, and failed lookups.

How do I find out which carrier a number belongs to?

Submit one number in E.164 form and CarrierLookup returns the network it was originally allocated to in the same response, as top-level fields of the result. There is no task queue, no polling and no callbacks. Nothing is ever sent to the number.

Is the carrier lookup real time?

The lookup is real time; the data is original allocation — keep the two apart. Once a number is submitted, the result comes back in the same HTTP response as top-level fields, with no task queue, no polling and no callbacks. What it returns is the network that number range was originally allocated to. It does not follow number portability, so it is not necessarily the carrier serving the number today, and it says nothing about whether the number is reachable. The dashboard, the single-number API and the synchronous multi-number API all return the same fields.

How is balance charged?

Permanent balance is a one-time purchase and does not renew. 30-day plan balance is valid for 30 days from payment; unused balance expires at the end of the current cycle. Plans renew automatically every 30 days until you turn off auto-renewal. Turning it off stops future charges; the current plan stays usable until it expires. Checks that fail or are undetermined are refunded to the relevant wallet.

How do I get the 100 free checks?

Create a free account and contact support to get 100 free checks. You can top up at any time.

Which payment methods are supported?

Permanent top-ups can be paid by credit card, other supported card payments, or cryptocurrency. 30-day plans use secure hosted card checkout and renew every 30 days. Card payments carry no extra fee. Cryptocurrency may include a service fee, shown at checkout.

How do I call the CarrierLookup API?

Create an API key in Settings, then call /api/v1/check with the X-API-Key header, a number and service_type=carrier. The carrier data comes back in that same JSON response as top-level fields — carrier, underlying_carrier, number_type, country_code, region and city; several numbers can be sent together through the synchronous multi endpoint.

Does a carrier result mean the number is active and reachable?

No. A result only reports the network a number was originally allocated to. It does not follow number portability and does not mean the number is currently reachable. You remain responsible for consent and applicable rules before contacting anyone.

What one carrier result can unlock

Create a free account Explore the API →

Find the original carrier behind a number, in real time

Real-time carrier lookup

NETWORK COVERAGE

Where does one carrier lookup fit into real work?

The fields teams actually receive

Four teams, four next steps

Give sales a more complete lead record

Use the result

Record the next step

What a carrier lookup returns

Number

Number type

Country code

Original carrier

Region

City

A lookup is only useful when the next step is clear

The number is there. The carrier field is empty.

How to call the real-time carrier lookup API

Carrier lookup pricing

$19.90

$9.90

Recent carrier lookup guides

Carrier lookup FAQ

What one carrier result can unlock