For agents, agencies and lead buyers
Check every purchased, aged or quote-form lead before it reaches your dialer: whether the carrier deactivated the number, mobile or landline after porting, a known TCPA litigator, on a state do-not-call list, with a timestamped result you can keep with the lead.
| Number | The lookup says | Do this |
|---|---|---|
| (813) 555-0124 | Mobile, can take texts | Call or text |
| (402) 555-0178 | Deactivated by the carrier Sep 28 | Return to vendor |
| (512) 555-0193 | Known TCPA litigator | Reject |
| (317) 555-0146 | Landline, can't take texts | Call only |
| (404) 555-0110 | Georgia area code, form says Ohio | Review |
Fictional 555 numbers.
A number reassigned since the lead opted in reaches someone who never consented, and the reassigned-number safe harbor only covers the FCC's database. deactivationDate flags carrier deactivations from the last 45 days.
47 CFR 64.1200(m) · ecfr.gov
deactivationDatereason A consumer can sue for $500 per violation of the TCPA robocall rules, or up to three times that if it was willful or knowing. The litigator scrub flags known TCPA litigators for 1 extra credit.
47 U.S.C. 227(b)(3) · law.cornell.edu
litigatorlitigator_type About 32% of the numbers we look up are landline or VoIP. The live carrier dip says mobile or landline after porting, and smsEligible marks the numbers that can take a text.
Source: CheckThatPhone lookup data
nanpTypedipCarrierTypesmsEligible Prior express written consent is a written agreement, signed by the person, that authorizes the seller to make autodialed or prerecorded marketing calls to that number. A phone lookup can tell you which leads are cell phones, not whether that agreement exists.
47 CFR 64.1200(f)(9) · ecfr.gov
nanpTypedipCarrierType A vendor post, a ping-post buy, an aged batch, or a submit on your own quote form.
One API call on the lead post, webhook or form submit, before the lead is routed. Aged batches go through CSV upload (deduplicated, up to 1,000,000 rows).
Keep optDate and reason with the lead record, so a return request has a timestamped result behind it.
Read these fields from every response. Absent DNC fields mean the check didn't run, not that the number is clear.
| If the response shows | Field | Do this |
|---|---|---|
| Deactivated by the carrier recently | deactivationDatereason | Don't dial. A candidate for a return request. |
| Known TCPA litigator | litigatorlitigator_type | Reject the lead, or send it to manual review. |
| Mobile that can take a text | nanpType = mobilesmsEligible | Call or text, within the consent the lead carries. |
| Landline | nanpTypedipCarrierType | Call. Text it only if the landline SMS check returns smsEligible: "true". |
| VoIP | dipCarrierSubType = IPES | Tag it. Use it as a lead-quality input when you score vendors. |
| On our internal blacklist | blackList | Reject. A litigator match also sets it; reason tells you which. |
| On a state do-not-call list | dncStateResult = STATE DNC | Suppress unless you hold consent. |
| State check absent (CO, FL, IN, LA, MA, MS, MO, OK, PA, TN, TX and WY) | dncStateChecked | Not checked. Use your own scrub for that state. |
| State differs from the one on the form | geoStategeoSource | Flag it for review. geoState comes from the IP you pass or from the area code, not from where the lead lives. |
| Every lookup | optDatereason | Store both with the lead: a timestamped record for vendor disputes. |
A purchased lead whose number the carrier deactivated on September 28. optDate timestamps the check and reason names the carrier id and date: the record you keep for a return request.
Highlighted fields: optDate, reason, deactivationDate, nanpType, litigator.
{
"success": true,
"credits_used": 2,
"data": {
"subscriber": "4025550178",
"optDate": "2026-10-09T13:12:44.581Z",
"action": "unsubscribe",
"deliverable": "false",
"reason": "Number deactivated by carrier id 6010 on 2026-09-28",
"deactivationDate": "2026-09-28",
"nanpType": "mobile",
"blackList": "false",
"dip": "success",
"dipLrn": "4025550178",
"dipPorted": "false",
"dipOcn": "6010",
"dipCarrierSubType": "WIRELESS",
"dipCarrier": "AT&T",
"dipCarrierType": "mobile",
"litigator": "false",
"litigator_type": "",
"litigator_name": "",
"geoState": "NE",
"geoCity": "omaha",
"geoCountry": "US",
"timezone": "America/Chicago",
"tzOffset": 6,
"geoSource": "area-code",
"error": "false",
"doNotSms": "true"
}
}Monthly cost, with the TCPA litigator scrub (+1 credit per number):
State DNC and complainer checks never add credits. The landline SMS check adds 1 credit per landline; mobiles are not charged.
optDate)Not legal advice.
dncStateChecked is left out for them, so "not checked" never reads as clear.deactivationDate: data refreshed daily, with a 1 to 7 day lag, and entries expire after 45 days. It is not a reassigned-number check.No. Autodialed or prerecorded marketing calls to a cell phone need prior express written consent: a written agreement, signed by the person, that authorizes the seller to call that number (47 CFR 64.1200(f)(9)). That record lives with your lead source, not in a phone lookup.
The Eleventh Circuit vacated it on January 24, 2025 (Insurance Marketing Coalition v. FCC), and it never took effect. Prior express written consent under 47 CFR 64.1200(a)(2) still applies to autodialed or prerecorded marketing calls to cell phones. This is not legal advice.
It gives you a record: optDate timestamps the lookup, and a deactivated number comes back with a reason like "Number deactivated by carrier id 6010 on 2026-09-28". Whether that earns a credit or a replacement is up to your contract with the vendor.
No. geoState comes from the IP you pass with the request or, without one, from the area code, which is where the number was issued. A mismatch with the state on the form is a reason to review the lead, not proof of fraud.
No. It runs the state do-not-call check for 38 states plus DC and screens our national complainer list. Get national registry access from the FTC at telemarketing.donotcall.gov; the FCC's safe harbor expects a copy no more than 31 days old (47 CFR 64.1200(c)(2)(i)(D)).
1 extra credit per number. It flags numbers tied to known TCPA litigators (litigator, litigator_type) from data refreshed daily, and a match sets action to "unsubscribe". About 1.5% of the numbers we check come back flagged when the scrub is on.
500 free lookups a month. Call the API on every lead post, or upload an aged batch as a CSV.