NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/26/2026
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
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| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 610-539 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN30 | PA |
| — | 610-541 | 2XXX3XXX5XXX8XXX9XXX · 3 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN13 | 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 |
| — | 610-558 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN10 | PA |
| — | 610-559 | 4XXX which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | EASTON | PA |
| — | 610-562 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | HAMBURG | PA |
| — | 610-565 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN12 | PA |
| — | 610-566 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN12 | PA |
| — | 610-567 | 7XXX8XXX · 2 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN31 | PA |
| — | 610-576 | 0XXX8XXX9XXX · 2 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN28 | PA |
| — | 610-578 | 2XXX which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN28 | PA |
| — | 610-581 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN25 | PA |
| — | 610-583 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN14 | PA |
| — | 610-584 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | CENTER PT | PA |
| — | 610-586 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN14 | PA |
| — | 610-594 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | EXTON | PA |
| — | 610-595 | 4XXX5XXX7XXX9XXX · 3 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN14 | PA |
| — | 610-603 | 2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | READING | PA |
| — | 610-604 | 2XXX6XXX8XXX which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN13 | PA |
| — | 610-606 | 1XXX5XXX6XXX8XXX · 4 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | ALLENTOWN | PA |
| — | 610-607 | 0XXX2XXX3XXX4XXX5XXX7XXX9XXX · 3 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | READING | PA |
| — | 610-614 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | NAZARETH | PA |
| — | 610-617 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN23 | PA |
| — | 610-622 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN17 | PA |
| — | 610-623 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN17 | PA |
| — | 610-626 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN17 | PA |
| — | 610-627 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN12 | PA |
| — | 610-629 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN31 | PA |
| — | 610-630 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN30 | PA |
| — | 610-631 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN30 | PA |
| — | 610-632 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN23 | PA |
| — | 610-635 | 5XXX6XXX8XXX9XXX which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN30 | PA |
| — | 610-640 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN28 | PA |
| — | 610-642 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN24 | PA |
| — | 610-644 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN28 | PA |
| — | 610-645 | 2XXX which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN24 | PA |
| — | 610-647 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN28 | PA |
| — | 610-648 | 2XXX which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN28 | PA |
| — | 610-649 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN24 | PA |
| — | 610-650 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN29 | PA |
| — | 610-651 | 3XXX which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN28 | PA |
| — | 610-655 | 5XXX7XXX which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | READING | PA |
| — | 610-658 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN24 | PA |
| — | 610-660 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN23 | PA |
| — | 610-661 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN22 | PA |
| — | 610-663 | 0XXX1XXX2XXX4XXX5XXX7XXX · 2 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | ALLENTOWN | PA |
| — | 610-664 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN23 | PA |
| — | 610-666 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN29 | PA |
| — | 610-667 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN23 | PA |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.