Prefix 317-478 — Indianapolis, IN

NANPA CO code assignment, current as of July 28, 2026.

Area code
317
Prefix (NXX)
478
Rate center
Indianapolis
State
Indiana
Time zone
Eastern
Code holder
NEW CINGULAR WIRELESS PCS, LLC - IL
OCN
6534
Pooled
Yes (thousands-block pooling)
Assigned
2011-09-15
LATA
336

Numbers in the 317-478 prefix are registered to the Indianapolis rate center in IN, inside area code 317. The prefix is the second block of a ten-digit US number (317-478-XXXX) and pins the number to a billing locality.

Code-holder of record: NEW CINGULAR WIRELESS PCS, LLC - IL (OCN 6534), assigned September 15, 2011. The prefix is pooled: its ten thousands-blocks can be shared among several carriers, so different 317-478 numbers may be served by different companies.

The rate center lies in the Indianapolis-Carmel-Greenwood, IN Metropolitan Statistical Area. The serving LATA is 336. Local time follows the Eastern zone.

Spoofing means this prefix on your screen doesn't guarantee a Indianapolis caller. Verify independently before trusting a request for money or data.

Neighboring prefixes

Prefixes adjacent to 317-478
PrefixRate centerCode holder
317-475 Indianapolis INDIANA BELL TEL CO INC
317-476 Indianapolis NEW CINGULAR WIRELESS PCS, LLC - IL
317-477 Greenfield HANCOCK COMMUNICATIONS, INC. - IN
317-479 Indianapolis INDIANA BELL TEL CO INC
317-480 Fairland OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC
317-481 Indianapolis INDIANA BELL TEL CO INC

FAQ

Where is 317-478 located?

The prefix is assigned to the Indianapolis rate center in IN, area code 317. It is part of the Indianapolis-Carmel-Greenwood, IN Metropolitan Statistical Area.

Which company owns 317-478 numbers?

NEW CINGULAR WIRELESS PCS, LLC - IL 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 317-478 safe to answer?

The prefix itself says nothing about the caller. Legitimate Indianapolis businesses and spoofed robocalls can both display it. Never share personal data with an unverified inbound caller.