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 610
New assignments by month
Sep 2026
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Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 610-505 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | PHPHSBZN30 | PA |
| — | 610-506 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | PHPHSBZN30 | PA |
| — | 610-507 | not yet reported which blocks → | D&E/OMNIPOINT WIREL JOINT VENT LP DBA PCS ONE | 6846 | READING | PA |
| — | 610-508 | 2XXX4XXX6XXX9XXX · 3 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | ALLENTOWN | PA |
| — | 610-509 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | ALLENTOWN | PA |
| — | 610-511 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | PA |
| — | 610-512 | not yet reported which blocks → | REDI-CALL COMMUNICATIONS CO. | 6810 | ALLENTOWN | PA |
| — | 610-513 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | PHPHSBZN30 | PA |
| — | 610-514 | 1XXX2XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DOWNINGTN | PA |
| — | 610-515 | 3XXX4XXX5XXX which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | EASTON | PA |
| — | 610-516 | 0XXX1XXX3XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → | CORE COMMUNICATIONS, INC. - PA | 3806 | LENAPE | PA |
| — | 610-517 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | PHPHSBZN23 | PA |
| — | 610-518 | 8XXX which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | DOWNINGTN | PA |
| — | 610-519 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN25 | PA |
| — | 610-520 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN25 | PA |
| — | 610-521 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN14 | PA |
| — | 610-522 | 3XXX7XXX · 2 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN14 | PA |
| — | 610-523 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - PA | 7434 | PHPHSBZN25 | PA |
| — | 610-524 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | EXTON | PA |
| — | 610-525 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN25 | PA |
| — | 610-526 | 3XXX4XXX8XXX · 3 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN25 | PA |
| — | 610-527 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN25 | PA |
| — | 610-528 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - PA | 7309 | CENTER PT | PA |
| — | 610-529 | none assigned yet which blocks → | OMNIPOINT COMMUNICATIONS ENTERPRISES, LP | 6626 | PHPHSBZN24 | PA |
| — | 610-530 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | ALLENTOWN | PA |
| — | 610-531 | not yet reported which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - PA | 7309 | PHPHSBZN30 | PA |
| — | 610-532 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN14 | PA |
| — | 610-533 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | ALLENTOWN | PA |
| — | 610-534 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN14 | PA |
| — | 610-535 | 1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → | PAETEC ITEL, LLC | 829J | PHPHSBZN26 | PA |
| — | 610-536 | 2XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - PA | 7309 | PHPHSBZN21 | PA |
| — | 610-537 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - PA | 7309 | PHPHSBZN14 | PA |
| — | 610-538 | 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - PA | 7309 | PHPHSBZN23 | PA |
| — | 610-539 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN30 | PA |
| — | 610-540 | 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - PA | 7434 | PHPHSBZN28 | PA |
| — | 610-541 | 2XXX3XXX5XXX8XXX9XXX · 3 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN13 | PA |
| — | 610-542 | 0XXX4XXX6XXX8XXX9XXX · 2 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - PA | 7309 | PHPHSBZN25 | PA |
| — | 610-543 | 9XXX which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN13 | PA |
| — | 610-544 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN13 | PA |
| — | 610-545 | 0–9 XXXall 10 · 4 holders which blocks → | ONVOY, LLC - PA | 547E | PHPHSBZN10 | PA |
| — | 610-546 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - PA | 7309 | PHPHSBZN11 | PA |
| — | 610-547 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | PHPHSBZN30 | PA |
| — | 610-548 | 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - PA | 7309 | PHPHSBZN12 | PA |
| — | 610-549 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - PA | 7309 | PHPHSBZN13 | PA |
| — | 610-552 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHPHSBZN24 | PA |
| — | 610-553 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 8 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - PA | 7309 | PHPHSBZN17 | PA |
| — | 610-554 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | ALLENTOWN | PA |
| — | 610-555 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | DIR ASST | PA |
| — | 610-557 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC - PA | 7309 | PHPHSBZN22 | PA |
| — | 610-558 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN10 | PA |
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.