CDXStreamer Technologies
Free Quick Lookup

Address Verification & Zip+4 Lookup

Enter a US street address to instantly get the USPS-standardized address with ZIP + 4, county, congressional district, and delivery point. No signup, no upload.

Enter the full street address. City + state or ZIP help, but aren't required. US addresses only.

Have a whole list? Address Verification corrects and standardizes thousands of addresses from a spreadsheet at once.

Bulk verify

Frequently Asked Questions

Is the address verification really free?

Yes — no signup or payment to verify individual addresses. There's a generous daily limit per visitor; verified accounts get a higher limit, and the bulk file tool handles unlimited lists.

What does it check?

We standardize the address against USPS data and return the corrected street address, ZIP + 4, county, congressional district, delivery point barcode (DPBC), and address type.

Does it support international or Canadian addresses?

Not yet — verification currently covers US addresses only.

What if I have a whole list of addresses?

Use the bulk Address Verification tool — upload a spreadsheet and get every address corrected and standardized at once, downloadable as CSV, Excel, or PDF.