NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026
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, all time — NPA 781
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| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2004-09-02 | 781-214 | 0–9 XXXall 10 · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | HULL | MA |
| 2001-04-11 | 781-995 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WOBURN | MA |
| 2001-02-23 | 781-518 | 0–9 XXXall 10 · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | MEDFORD | MA |
| 2001-02-23 | 781-626 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WEYMOUTH | MA |
| 2001-01-12 | 781-390 | 0XXX1XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | RANDOLPH | MA |
| — | 781-210 | 1XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | COHASSET | MA |
| — | 781-215 | 0XXX1XXX2XXX3XXX4XXX6XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | LYNN | MA |
| — | 781-253 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | SHARON | MA |
| — | 781-277 | 1XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WEYMOUTH | MA |
| — | 781-287 | 2XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WOBURN | MA |
| — | 781-312 | 1XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | HANOVER | MA |
| — | 781-323 | 0XXX3XXX6XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | LEXINGTON | MA |
| — | 781-325 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | LEXINGTON | MA |
| — | 781-328 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | BURLINGTON | MA |
| — | 781-336 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | KINGSTON | MA |
| — | 781-343 | 1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | NEEDHAM | MA |
| — | 781-353 | 0XXX1XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | BRAINTREE | MA |
| — | 781-399 | 0XXX1XXX2XXX5XXX7XXX8XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | MALDEN | MA |
| — | 781-426 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | REVERE | MA |
| — | 781-476 | 0–9 XXXall 10 · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | MARBLEHEAD | MA |
| — | 781-479 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | LYNN | MA |
| — | 781-497 | 4XXX5XXX6XXX8XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WOBURN | MA |
| — | 781-507 | 1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | STONEHAM | MA |
| — | 781-519 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | BRAINTREE | MA |
| — | 781-538 | 1XXX2XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | LEXINGTON | MA |
| — | 781-549 | 0XXX3XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | REVERE | MA |
| — | 781-577 | 3XXX4XXX5XXX8XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WALTHAM | MA |
| — | 781-583 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | ARLINGTON | MA |
| — | 781-625 | 1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WINCHESTER | MA |
| — | 781-651 | 0XXX1XXX2XXX5XXX6XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | LYNNFIELD | MA |
| — | 781-679 | 1XXX3XXX4XXX5XXX7XXX8XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | KINGSTON | MA |
| — | 781-683 | 0XXX1XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WAKEFIELD | MA |
| — | 781-688 | 3XXX4XXX6XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | NORWOOD | MA |
| — | 781-694 | 1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WELLESLEY | MA |
| — | 781-695 | 0XXX1XXX6XXX7XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | STOUGHTON | MA |
| — | 781-708 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | DEDHAM | MA |
| — | 781-713 | 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | CANTON | MA |
| — | 781-730 | 2XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | BURLINGTON | MA |
| — | 781-734 | 6XXX7XXX9XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | LEXINGTON | MA |
| — | 781-742 | 0XXX1XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | DEDHAM | MA |
| — | 781-752 | 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | DEDHAM | MA |
| — | 781-753 | 0XXX1XXX5XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | ROCKLAND | MA |
| — | 781-770 | 1XXX4XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | CANTON | MA |
| — | 781-780 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | LYNN | MA |
| — | 781-785 | 1XXX2XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | RANDOLPH | MA |
| — | 781-786 | 1XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WALTHAM | MA |
| — | 781-791 | 3XXX4XXX6XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | BURLINGTON | MA |
| — | 781-795 | 0XXX2XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | WALTHAM | MA |
| — | 781-818 | 0XXX1XXX3XXX5XXX6XXX8XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | STOUGHTON | MA |
| — | 781-827 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - MA | 4018 | MEDFORD | MA |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.