Prefix 512-503 — Austin, TX
Numbers in the 512-503 prefix are registered to the Austin rate center in TX, inside area code 512. The prefix is the second block of a ten-digit US number (512-503-XXXX) and pins the number to a billing locality.
The assigned code holder is ONVOY, LLC - TX, operating company number 903C, assigned April 28, 2022. This is a pooled prefix — expect numbers within it to be split across more than one carrier in 1,000-number blocks.
The rate center lies in the Austin-Round Rock-San Marcos, TX Metropolitan Statistical Area. The serving LATA is 558. Local time follows the Central zone.
Spoofing means this prefix on your screen doesn't guarantee a Austin caller. Verify independently before trusting a request for money or data.
Neighboring prefixes
| Prefix | Rate center | Code holder |
|---|---|---|
| 512-500 | Austin | LEVEL 3 COMMUNICATIONS, LLC - TX |
| 512-501 | Austin | ONVOY, LLC - TX |
| 512-502 | Austin | SOUTHWESTERN BELL |
| 512-504 | Kyle | GRANDE COMMUNICATIONS NETWORKS, INC. - TX |
| 512-505 | Austin | SOUTHWESTERN BELL |
| 512-506 | Austin | SOUTHWESTERN BELL |
FAQ
Where is 512-503 located?
The prefix is assigned to the Austin rate center in TX, area code 512. It is part of the Austin-Round Rock-San Marcos, TX Metropolitan Statistical Area.
Which company owns 512-503 numbers?
ONVOY, LLC - TX holds the code, but the prefix is pooled — individual thousands-blocks can be assigned to other carriers, and numbers may be ported to any provider.
Is a call from 512-503 safe to answer?
The prefix itself says nothing about the caller. Legitimate Austin businesses and spoofed robocalls can both display it. Never share personal data with an unverified inbound caller.