Real-time carrier DIP, line type, portability, deliverability, and geolocation in one POST. Optional TCPA litigator filter and landline SMS reachability — two add-ons no marketplace API gives you.
Starting at $0.001 per call — Free tier: 500 lookups/month, no credit card
Try It Free
Enable litigatorFilter on any lookup and we check the number against our TCPA
litigator database. We return litigator, litigator_type, and
litigator_name so you can route the contact out of your campaign automatically
— before legal does it for you.
{
"phone": "8016667777",
"litigatorFilter": true
}
A growing slice of landlines are SMS-enabled through providers like Bandwidth, Google Voice,
and Twilio. Set landlineSmsLookup: true and we check messaging eligibility per
number — mobile numbers are skipped, so you only pay the extra credit when the lookup
actually applies.
{
"phone": "8016667777",
"landlineSmsLookup": true
} Capabilities
Know if a number is mobile, landline, or VoIP. Filter invalid numbers before contact attempts.
Direct carrier lookup returns the operating carrier name and OCN identifier code.
Up-to-date number portability status. Know if a number has been ported to another carrier.
Determine instantly whether a phone number is reachable and can receive calls or SMS.
City, country, and metro area data based on the area code. Precise timezone information.
Provide an IP with your request and get precise timezone and location data for the phone owner.
Local Routing Number (LRN) — the most accurate data used for call and SMS routing.
Check against our internal platform blacklist for flagged numbers. An extra signal for your filtering logic.
Optional add-on. Check every number against our TCPA litigator database — returns three dedicated litigator fields. +1 credit per lookup.
Optional add-on. Detect SMS-eligible landlines via their messaging provider. Mobile numbers skipped — pay only when applied.
Example Response
/v1/lookup · standard call {
"success": true,
"credits_used": 1,
"data": {
"subscriber": "8182925409",
"optDate": "2026-05-21T18:55:56.532Z",
"action": "send",
"deliverable": "true",
"reason": "",
"nanpType": "mobile",
"nanpCarrier": "verizon",
"blackList": "false",
"ipResult": "valid-v4",
"dip": "success",
"dipLrn": "8182925409",
"dipPorted": "false",
"dipOcn": "6010",
"dipCarrier": "AT&T",
"dipCarrierSubType": "WIRELESS",
"dipCarrierType": "mobile",
"geoCountry": "US",
"geoState": "CA",
"geoCity": "Riverside",
"geoMetro": 803,
"geoSource": "ip",
"timezone": "America/Los_Angeles",
"tzOffset": 8
}
}/v1/lookup · with both add-ons enabled {
"success": true,
"credits_used": 3,
"data": {
"subscriber": "2627834719",
"optDate": "2026-05-22T14:30:29.735Z",
"action": "unsubscribe",
"deliverable": "false",
"reason": "Associated with TCPA Litigator DO NOT CONTACT",
"nanpType": "mobile",
"blackList": "true",
"dip": "success",
"dipLrn": "2627834719",
"dipPorted": "false",
"dipOcn": "9327",
"dipCarrier": "AT&T Wisconsin",
"dipCarrierSubType": "RBOC",
"dipCarrierType": "landline",
"dipMessagingLookup": "false",
"dipMessagingEnabled": "false",
"litigator": "true",
"litigator_type": "litigator",
"litigator_name": "Jean Zoulek",
"geoCountry": "US",
"geoState": "WI",
"geoCity": "kenosha",
"geoSource": "area-code",
"timezone": "America/Chicago",
"tzOffset": 6
}
}success, credits_used, and data. The X-Credits-Used response header mirrors the count.
Authoritative carrier name and type, OCN, LRN, and porting status — sourced directly from carrier records.
action, deliverable, reason, nanpType, deactivation, age, and blacklist signals in one place.
Country, state, city, metro, timezone, and UTC offset — resolved from the supplied IP or the area code.
Set litigatorFilter: true and you get three TCPA litigator fields plus an action of unsubscribe on a match.
Set landlineSmsLookup: true and we add five dipMessaging* fields for landlines that can actually receive SMS.
Why CheckThatPhone
One API call returns carrier, line type, portability, geo, and routing data. No need for multiple providers.
Sourced directly from carrier records and the Mobile Switching Center. Not cached, not stale.
From $0.001 per call on metered plans, even less on custom plans. Free tier available.
We don't store your data. It is deleted right after your request is processed. Zero retention.
We don't make a TCPA determination for you, but we ship the litigatorFilter add-on so you can scrub against our internal litigator database before contact. Our carrier data and action recommendations are advisory; final outreach decisions belong to you and your consent records.
Real-time carrier DIP on every lookup, unless the same number was queried in the last 24 hours — in which case we serve a cached result and no credit is charged. The upstream feed is sourced directly from carrier records, not a stale scrape.
Paid plans (1K, 10K, 100K, and Pay As You Go) have no hard limit — overage is billed at the per-credit rate shown on the pricing page. The Free plan is hard-capped at 500 lookups per month for abuse prevention.
A { success, credits_used, data } envelope. Inside data you get up to 25+ fields covering carrier DIP, line type, deliverability, geolocation, and — when their flags are enabled — litigator and landline-messaging fields. The full reference lives in the docs.
Yes, from your dashboard. Paid access continues to the end of the current billing period; we do not refund the unused portion. The Free plan can be deleted immediately.
500 lookups per month, hard-capped, no credit card required. Sign up and your API key is issued in seconds.
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