Recent prefix assignments
375 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/30/2026
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.
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 413-420 | 3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → | PAETEC ITEL, LLC | 829J | HOLYOKE | MA |
| — | 413-424 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → | VERIZON NEW ENGLAND INC. | 9102 | MONROE BDG | MA |
| — | 413-425 | 3XXX9XXX · 2 holders which blocks → | PAETEC ITEL, LLC | 829J | HOLYOKE | MA |
| — | 413-426 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → | VERIZON NEW ENGLAND INC. | 9102 | SPRINGFLD | MA |
| — | 413-427 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | HOLYOKE | MA |
| — | 413-429 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | TC SYSTEMS, INC. | 7135 | GREATBNGTN | MA |
| — | 413-430 | 0–9 XXXall 10 · 5 holders which blocks → | NUSO, LLC | 732J | HOLYOKE | MA |
| — | 413-431 | not yet reported which blocks → | PAETEC ITEL, LLC | 829J | LUDLOW | MA |
| — | 413-433 | not yet reported which blocks → | OMNIPOINT MIAMI E LICENSE, LLC | 6889 | SPRINGFLD | MA |
| — | 413-436 | 2XXX6XXX8XXX · 3 holders which blocks → | VERIZON NEW ENGLAND INC. | 9102 | WARREN | MA |
| — | 413-437 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → | PAETEC ITEL, LLC | 829J | HOLYOKE | MA |
| — | 413-439 | 3XXX5XXX · 2 holders which blocks → | PAETEC ITEL, LLC | 829J | SPRINGFLD | MA |
| — | 413-441 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | PITTSFIELD | MA |
| — | 413-442 | not yet reported which blocks → | VERIZON NEW ENGLAND INC. | 9102 | PITTSFIELD | MA |
| — | 413-443 | not yet reported which blocks → | VERIZON NEW ENGLAND INC. | 9102 | PITTSFIELD | MA |
| — | 413-444 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | ONVOY, LLC - MA | 892D | BERNARDSTN | MA |
| — | 413-445 | 1XXX which blocks → | VERIZON NEW ENGLAND INC. | 9102 | PITTSFIELD | MA |
| — | 413-446 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | PITTSFIELD | MA |
| — | 413-447 | none assigned yet which blocks → | VERIZON NEW ENGLAND INC. | 9102 | PITTSFIELD | MA |
| — | 413-448 | none assigned yet which blocks → | VERIZON NEW ENGLAND INC. | 9102 | PITTSFIELD | MA |
| — | 413-449 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | TC SYSTEMS, INC. | 7135 | PITTSFIELD | MA |
| — | 413-451 | not yet reported which blocks → | PAETEC ITEL, LLC | 829J | LONGMEADOW | MA |
| — | 413-452 | 8XXX which blocks → | VERIZON NEW ENGLAND INC. | 9102 | SPRINGFLD | MA |
| — | 413-453 | 1XXX6XXX · 2 holders which blocks → | BANDWIDTH.COM CLEC, LLC - MA | 990E | SO DEERFLD | MA |
| — | 413-454 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → | PAETEC ITEL, LLC | 829J | WESTFIELD | MA |
| — | 413-458 | 6XXX which blocks → | VERIZON NEW ENGLAND INC. | 9102 | WILLIAMSTN | MA |
| — | 413-459 | 1XXX3XXX5XXX6XXX7XXX8XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | CHICOPEE | MA |
| — | 413-460 | not yet reported which blocks → | PAETEC ITEL, LLC | 829J | BELCHERTN | MA |
| — | 413-461 | 1XXX3XXX5XXX6XXX8XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | AMHERST | MA |
| — | 413-467 | not yet reported which blocks → | GRANBY TELEPHONE LLC | 0036 | GRANBY | MA |
| — | 413-470 | not yet reported which blocks → | VERIZON NEW ENGLAND INC. | 9102 | XXXXXXXXXX | MA |
| — | 413-471 | 3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | CHESTERFLD | MA |
| — | 413-473 | not yet reported which blocks → | PAETEC ITEL, LLC | 829J | NORTHADAMS | MA |
| — | 413-474 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → | PAETEC ITEL, LLC | 829J | CHICOPEE | MA |
| — | 413-475 | 0–9 XXXall 10 · 7 holders which blocks → | TC SYSTEMS, INC. | 7135 | GREENFIELD | MA |
| — | 413-477 | 1XXX4XXX5XXX7XXX · 4 holders which blocks → | VERIZON NEW ENGLAND INC. | 9102 | GILBERTVL | MA |
| — | 413-478 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | SPRINGFLD | MA |
| — | 413-480 | not yet reported which blocks → | PAETEC ITEL, LLC | 829J | WESTFIELD | MA |
| — | 413-485 | 4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | PAETEC ITEL, LLC | 829J | WESTFIELD | MA |
| — | 413-486 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | PAETEC ITEL, LLC | 829J | ELONGMEDOW | MA |
| — | 413-487 | not yet reported which blocks → | PAETEC ITEL, LLC | 829J | WARREN | MA |
| — | 413-493 | 5XXX6XXX · 2 holders which blocks → | VERIZON NEW ENGLAND INC. | 9102 | HOLYOKE | MA |
| — | 413-494 | 0XXX1XXX · 2 holders which blocks → | VERIZON NEW ENGLAND INC. | 9102 | PITTSFIELD | MA |
| — | 413-495 | 1XXX2XXX · 2 holders which blocks → | PAETEC ITEL, LLC | 829J | SPRINGFLD | MA |
| — | 413-496 | 1XXX3XXX4XXX5XXX7XXX · 3 holders which blocks → | VERIZON NEW ENGLAND INC. | 9102 | PITTSFIELD | MA |
| — | 413-498 | 1XXX which blocks → | VERIZON NEW ENGLAND INC. | 9102 | NORTHFIELD | MA |
| — | 413-499 | not yet reported which blocks → | VERIZON NEW ENGLAND INC. | 9102 | PITTSFIELD | MA |
| — | 413-500 | 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | ONVOY, LLC - MA | 892D | MONROE BDG | MA |
| — | 413-502 | not yet reported which blocks → | PAETEC ITEL, LLC | 829J | WILLIAMSBG | MA |
| — | 413-504 | 2XXX3XXX8XXX9XXX · 2 holders which blocks → | TC SYSTEMS, INC. | 7135 | SPRINGFLD | MA |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.