NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026
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 |
|---|---|---|---|---|---|---|
| 2018-08-02 | 774-374 | 0–9 XXXall 10 · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | MARLBORO | MA |
| 2017-09-07 | 774-350 | 0–9 XXXwhole prefix which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | HOPKINTON | MA |
| 2006-12-21 | 774-538 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | PROVINCETN | MA |
| 2006-05-15 | 774-567 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | DOVER | MA |
| 2002-07-29 | 774-323 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX9XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | BREWSTER | MA |
| 2002-07-29 | 774-450 | 0–9 XXXall 10 · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | W BOYLSTON | MA |
| 2002-07-29 | 774-481 | 0–9 XXXall 10 · 8 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | UXBRIDGE | MA |
| 2002-07-29 | 774-745 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | SPENCER | MA |
| 2002-07-29 | 774-847 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WRENTHAM | MA |
| 2002-07-29 | 774-854 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | MEDWAY | MA |
| 2002-07-29 | 774-901 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | SEEKONK | MA |
| 2002-01-21 | 774-252 | 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | CATAUMET | MA |
| 2001-12-21 | 774-207 | 0–9 XXXall 10 · 8 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | ORLEANS | MA |
| 2001-12-21 | 774-768 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | SIASCONSET | MA |
| 2001-09-24 | 774-214 | 0–9 XXXall 10 · 8 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | SHREWSBURY | MA |
| 2001-07-06 | 774-470 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | HYANNIS | MA |
| 2001-04-19 | 774-206 | 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | NEWBEDFORD | MA |
| 2001-03-20 | 774-330 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | BARNSTABLE | MA |
| 2001-03-20 | 774-763 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | FALMOUTH | MA |
| 2001-03-20 | 774-999 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | FRAMINGHAM | MA |
| — | 774-530 | 0–9 XXXall 10 · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WORCESTER | MA |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.