NumberResearchRecent prefix assignments
347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026
The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.
Most active assignees, last 30 days
New assignments by month
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Quick find in this area code:
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 423-339 | none assigned yet which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CLEVELAND | TN |
| — | 423-340 | 3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → | SUNCOM DBA T-MOBILE USA | 8645 | BRISTOL | TN |
| — | 423-341 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | BRISTOL | TN |
| — | 423-343 | 2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | KINGSPORT | TN |
| — | 423-344 | not yet reported which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| — | 423-345 | 1XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | SURGOINSVL | TN |
| — | 423-346 | not yet reported which blocks → | HIGHLAND TEL. COOP, INC. | 0565 | WARTBURG | TN |
| — | 423-347 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → | BANDWIDTH.COM CLEC, LLC - TN | 124F | ROGERSVL | TN |
| — | 423-348 | not yet reported which blocks → | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | FALLBRANCH | TN |
| — | 423-349 | 3XXX8XXX · 2 holders which blocks → | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | SULIVNGDNS | TN |
| — | 423-351 | 5XXX which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | SWEETWATER | TN |
| — | 423-352 | 0XXX2XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | PAETEC ITEL, LLC | 829J | LAFOLLETTE | TN |
| — | 423-354 | 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | BLOUNTVL | TN |
| — | 423-355 | 5XXX8XXX · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | CHATTNOOGA | TN |
| — | 423-357 | not yet reported which blocks → | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | CHURCHHILL | TN |
| — | 423-360 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | MIDWAY SUL | TN |
| — | 423-361 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | MIDWAY SUL | TN |
| — | 423-362 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | CHATTNOOGA | TN |
| — | 423-364 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | CHATTNOOGA | TN |
| — | 423-365 | not yet reported which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | SPRINGCITY | TN |
| — | 423-366 | 4XXX5XXX6XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | BRISTOL | TN |
| — | 423-367 | 5XXX9XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | KINGSPORT | TN |
| — | 423-368 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN | 6673 | ATHENS | TN |
| — | 423-369 | not yet reported which blocks → | HIGHLAND TEL. COOP, INC. | 0565 | OAKDALE | TN |
| — | 423-370 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | ONVOY, LLC - TN | 525E | ATHENS | TN |
| — | 423-371 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | POWERTEL NASHVILLE LICENSES, INC. | 7476 | SWEETWATER | TN |
| — | 423-372 | 2XXX6XXX8XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - TN | 4806 | JELLICO | TN |
| — | 423-373 | 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | ONVOY, LLC - TN | 525E | BULLS GAP | TN |
| — | 423-374 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | ONVOY, LLC - TN | 525E | LAFOLLETTE | TN |
| — | 423-376 | 1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | ONVOY, LLC - TN | 525E | MADISONVL | TN |
| — | 423-377 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → | UNITED STATES CELLULAR - TN | 6278 | LAFOLLETTE | TN |
| — | 423-378 | not yet reported which blocks → | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | KINGSPORT | TN |
| — | 423-379 | 0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | ONVOY, LLC - TN | 525E | NEWPORT | TN |
| — | 423-380 | 0–9 XXXall 10 · 4 holders which blocks → | BANDWIDTH.COM CLEC, LLC - TN | 124F | CLEVELAND | TN |
| — | 423-381 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | POWERTEL NASHVILLE LICENSES, INC. | 7476 | ATHENS | TN |
| — | 423-382 | 1XXX2XXX4XXX6XXX7XXX8XXX · 6 holders which blocks → | ONVOY, LLC - TN | 525E | SNEEDVILLE | TN |
| — | 423-385 | 0XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → | PAETEC ITEL, LLC | 829J | CHATTNOOGA | TN |
| — | 423-386 | 5XXX which blocks → | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | CHATTNOOGA | TN |
| — | 423-391 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | BLUFF CITY | TN |
| — | 423-392 | not yet reported which blocks → | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | KINGSPORT | TN |
| — | 423-393 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | BULLS GAP | TN |
| — | 423-394 | 2XXX3XXX6XXX7XXX9XXX which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | CHATTNOOGA | TN |
| — | 423-396 | 0XXX1XXX6XXX which blocks → | BRIGHTSPEED OF SOUTHERN TENNESSEE, LC | 0574 | COLLEGEDL | TN |
| — | 423-400 | none assigned yet which blocks → | POWERTEL ATLANTA LICENSES, INC. | 7473 | CHATTNOOGA | TN |
| — | 423-401 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | PAETEC ITEL, LLC | 829J | SODDYDAISY | TN |
| — | 423-404 | 0XXX1XXX2XXX6XXX9XXX · 2 holders which blocks → | NEW CINGULAR WIRELESS PCS, LLC - GA | 6214 | MADISONVL | TN |
| — | 423-409 | not yet reported which blocks → | SPOK, INC. | 6630 | BULLS GAP | TN |
| — | 423-410 | not yet reported which blocks → | UNITED TELEPHONE-SOUTHEAST-TN DBA CENTURYLINK - TN | 4510 | JOHNSON CY | TN |
| — | 423-411 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | TN |
| — | 423-412 | not yet reported which blocks → | SPOK, INC. | 6630 | JOHNSON CY | TN |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.