NumberResearchRecent prefix assignments
334 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/28/2026
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
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| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 610-421 | 0XXX1XXX2XXX3XXX4XXX5XXX9XXX · 4 holders which blocks → | RCN TELECOM SERVICES OF PENNSYLVANIA, INC. | 7615 | EMMAUS | PA |
| — | 610-422 | 1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - PA | 7309 | PHOENIXVL | PA |
| — | 610-423 | 0XXX1XXX2XXX3XXX5XXX7XXX9XXX · 2 holders which blocks → | PAETEC ITEL, LLC | 829J | EXTON | PA |
| — | 610-425 | 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | W CHESTER | PA |
| — | 610-426 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - PA | 7309 | KUTZTOWN | PA |
| — | 610-427 | 0–9 XXXall 10 · 8 holders which blocks → | AT&T - LOCAL | 7421 | POTTSTOWN | PA |
| — | 610-428 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA | 6392 | BETHLEHEM | PA |
| — | 610-429 | 7XXX which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | W CHESTER | PA |
| — | 610-430 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | W CHESTER | PA |
| — | 610-431 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | W CHESTER | PA |
| — | 610-432 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | ALLENTOWN | PA |
| — | 610-433 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | ALLENTOWN | PA |
| — | 610-434 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | ALLENTOWN | PA |
| — | 610-435 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | ALLENTOWN | PA |
| — | 610-436 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | W CHESTER | PA |
| — | 610-437 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | ALLENTOWN | PA |
| — | 610-438 | 7XXX which blocks → | RCN TELECOM SERVICES OF PENNSYLVANIA, INC. | 7615 | EASTON | PA |
| — | 610-439 | 9XXX which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | ALLENTOWN | PA |
| — | 610-440 | 3XXX4XXX7XXX · 2 holders which blocks → | RCN TELECOM SERVICES OF PENNSYLVANIA, INC. | 7615 | NORTHAMPTN | PA |
| — | 610-441 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → | RCN TELECOM SERVICES OF PENNSYLVANIA, INC. | 7615 | W CHESTER | PA |
| — | 610-442 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA | 6392 | BETHLEHEM | PA |
| — | 610-443 | 4XXX which blocks → | RCN TELECOM SERVICES OF PENNSYLVANIA, INC. | 7615 | CATASAUQUA | PA |
| — | 610-444 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | KENNETT SQ | PA |
| — | 610-446 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN21 | PA |
| — | 610-447 | 4XXX9XXX · 2 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN11 | PA |
| — | 610-448 | not yet reported which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - PA | 7434 | PHPHSBZN28 | PA |
| — | 610-449 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN21 | PA |
| — | 610-450 | 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | EXTON | PA |
| — | 610-451 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | READING | PA |
| — | 610-453 | none assigned yet which blocks → | OMNIPOINT COMMUNICATIONS ENTERPRISES, LP | 6626 | PHPHSBZN24 | PA |
| — | 610-454 | 3XXX5XXX8XXX · 3 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | COLLEGEVL | PA |
| — | 610-455 | 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | WESTTOWN | PA |
| — | 610-456 | 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HELLERTOWN | PA |
| — | 610-457 | not yet reported which blocks → | OMNIPOINT COMMUNICATIONS ENTERPRISES, LP | 6626 | PHPHSBZN26 | PA |
| — | 610-458 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | EAGLE | PA |
| — | 610-459 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN10 | PA |
| — | 610-461 | 9XXX which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN14 | PA |
| — | 610-462 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | ALLENTOWN | PA |
| — | 610-463 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | AT&T - LOCAL | 7421 | READING | PA |
| — | 610-464 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | PHPHSBZN23 | PA |
| — | 610-465 | 1XXX2XXX3XXX4XXX6XXX · 2 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | CATASAUQUA | PA |
| — | 610-466 | 5XXX8XXX · 2 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | COATESVL | PA |
| — | 610-468 | not yet reported which blocks → | LIMITLESS MOBILE, LLC | 6921 | READING | PA |
| — | 610-469 | 3XXX4XXX · 2 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PUGHTOWN | PA |
| — | 610-470 | 2XXX which blocks → | OMNIPOINT COMMUNICATIONS ENTERPRISES, LP | 6626 | AVONDALE | PA |
| — | 610-471 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHPHSBZN11 | PA |
| — | 610-473 | not yet reported which blocks → | WINDSTREAM CONESTOGA, INC. | 0162 | BOYERTOWN | PA |
| — | 610-474 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | BLOCK LINE SYSTEMS, LLC - PA | 784E | ROYERSFORD | PA |
| — | 610-475 | not yet reported which blocks → | SPOK, INC. | 6630 | PHPHSBZN31 | PA |
| — | 610-476 | none assigned yet which blocks → | OMNIPOINT COMMUNICATIONS ENTERPRISES, LP | 6626 | PHPHSBZN31 | PA |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/28/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.