TIN Lookup
Identify the type and geographic origin of US Taxpayer Identification Numbers. Determines whether a TIN is an SSN, EIN, or ITIN and returns the issuing state/campus. Uses publicly documented SSA area number tables and IRS prefix assignments. No personal information is accessed or returned.
TIN Identification
GET /api/v1/pro/tin/lookup Requires API key Pass any 9-digit TIN. Returns the type (SSN/EIN/ITIN) and geographic info. The full TIN is never stored or logged — only the prefix is analyzed.
| tin | 9-digit TIN (dashes stripped automatically) |
curl -H "Authorization: Bearer pro_YOUR_KEY" \
"https://api.verilexdata.com/api/v1/pro/tin/lookup?tin=531234567"Response (SSN example)
{
"dataset": "tin",
"type": "ssn",
"data": {
"tin_masked": "531-XX-XXXX",
"digits_analyzed": 9,
"tin_type": "SSN",
"description": "Social Security Number",
"area_number": 531,
"issuing_authority": "SSA",
"issuing_state": "WA",
"issuing_state_name": "Washington",
"randomization_note": "SSN area numbers reflect the state of issuance for SSNs assigned before June 25, 2011."
}
}SSN Area Number Lookup
GET /api/v1/pro/tin/ssn-area Requires API key | area | 3-digit area number (first 3 digits of SSN) |
| state | Two-letter state code (returns all area ranges for that state) |
EIN Prefix Lookup
GET /api/v1/pro/tin/ein-prefix Requires API key | prefix | 2-digit EIN prefix |
| state | State code (returns all prefixes for that state's IRS campus) |
curl -H "Authorization: Bearer pro_YOUR_KEY" \
"https://api.verilexdata.com/api/v1/pro/tin/ein-prefix?prefix=30"Response
{
"dataset": "tin",
"type": "ein_prefix",
"count": 1,
"data": [
{ "prefix": "30", "campus": "Cincinnati", "state": "OH" }
]
}Privacy & compliance
This endpoint analyzes the prefix only (first 2-3 digits) of a TIN against publicly documented government tables. No personal information is accessed, stored, or returned. The full TIN is never logged. SSA area number mappings are from the official Social Security Administration publication. EIN prefix mappings are from IRS documentation.