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.
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 508-282 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → | RCN TELECOM SERVICES, INC. - MA | 7619 | MILFORD | MA |
| — | 508-315 | 1XXX2XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → | RCN TELECOM SERVICES, INC. - MA | 7619 | NATICK | MA |
| — | 508-392 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → | RCN TELECOM SERVICES, INC. - MA | 7619 | CATAUMET | MA |
| — | 508-405 | 5XXX6XXX7XXX9XXX · 2 holders which blocks → | RCN TELECOM SERVICES, INC. - MA | 7619 | FRAMINGHAM | MA |
| — | 508-425 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → | RCN TELECOM SERVICES, INC. - MA | 7619 | WORCESTER | MA |
| — | 508-439 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → | RCN TELECOM SERVICES, INC. - MA | 7619 | WESTBORO | MA |
| — | 508-440 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → | RCN TELECOM SERVICES, INC. - MA | 7619 | FRANKLIN | MA |
| — | 508-461 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → | RCN TELECOM SERVICES, INC. - MA | 7619 | WEBSTER | MA |
| — | 508-510 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → | RCN TELECOM SERVICES, INC. - MA | 7619 | BROCKTON | MA |
| — | 508-525 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → | RCN TELECOM SERVICES, INC. - MA | 7619 | NEWBEDFORD | MA |
| — | 508-815 | 0–9 XXXall 10 · 6 holders which blocks → | RCN TELECOM SERVICES, INC. - MA | 7619 | HYANNIS | 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.