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
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| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 610-887 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHPHSBZN17 | PA |
| — | 610-888 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | PHPHSBZN30 | PA |
| — | 610-889 | none assigned yet which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN28 | PA |
| — | 610-891 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN12 | PA |
| — | 610-892 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN12 | PA |
| — | 610-893 | 0XXX5XXX6XXX8XXX · 2 holders which blocks → | AT&T - LOCAL | 7421 | PHPHSBZN28 | PA |
| — | 610-894 | 0XXX1XXX6XXX7XXX9XXX · 4 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | KUTZTOWN | PA |
| — | 610-895 | 0XXX2XXX3XXX4XXX6XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | KUNKLETOWN | PA |
| — | 610-896 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN24 | PA |
| — | 610-897 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - PA | 7434 | PHPHSBZN31 | PA |
| — | 610-898 | 2XXX3XXX4XXX · 3 holders which blocks → | WINDSTREAM D & E SYSTEMS, INC. - PA | 4114 | READING | PA |
| — | 610-900 | 0XXX1XXX4XXX6XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PALMERTON | PA |
| — | 610-902 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN26 | PA |
| — | 610-903 | 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | EXTON | PA |
| — | 610-904 | 0–9 XXXall 10 · 8 holders which blocks → | VERIZON NORTH, INC. - PA (CONTEL) | 0170 | EMMAUS | PA |
| — | 610-905 | not yet reported which blocks → | OMNIPOINT COMMUNICATIONS ENTERPRISES, LP | 6626 | EASTON | PA |
| — | 610-906 | 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | POTTSTOWN | PA |
| — | 610-907 | not yet reported which blocks → | SPOK, INC. | 6630 | PHPHSBZN31 | PA |
| — | 610-908 | 0XXX2XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → | AT&T - LOCAL | 7421 | PHPHSBZN30 | PA |
| — | 610-909 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | PHPHSBZN23 | PA |
| — | 610-910 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | AVONDALE | PA |
| — | 610-911 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | PA |
| — | 610-912 | not yet reported which blocks → | SPOK, INC. | 6630 | ALLENTOWN | PA |
| — | 610-913 | not yet reported which blocks → | WINDSTREAM CONESTOGA, INC. | 0162 | MORGANTOWN | PA |
| — | 610-914 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | READING | PA |
| — | 610-915 | 1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHPHSBZN14 | PA |
| — | 610-916 | not yet reported which blocks → | COMMONWEALTH TELEPHONE COMPANY LLC | 0161 | LEESPORT | PA |
| — | 610-917 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHOENIXVL | PA |
| — | 610-918 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | W CHESTER | PA |
| — | 610-921 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | READING | PA |
| — | 610-922 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → | NETCARRIER TELECOM, INC. - PA | 5494 | PHPHSBZN25 | PA |
| — | 610-923 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | EASTON | PA |
| — | 610-924 | 1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN21 | PA |
| — | 610-925 | 6XXX7XXX8XXX9XXX · 3 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | KENNETT SQ | PA |
| — | 610-926 | not yet reported which blocks → | COMMONWEALTH TELEPHONE COMPANY LLC | 0161 | LEESPORT | PA |
| — | 610-927 | 5XXX6XXX7XXX · 2 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | READING | PA |
| — | 610-928 | 9XXX which blocks → | SERVICE ELECTRIC TELEPHONE COMPANY, LLC | 8320 | EMMAUS | PA |
| — | 610-929 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | READING | PA |
| — | 610-930 | 3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - PA | 7434 | PHPHSBZN30 | PA |
| — | 610-932 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | OXFORD | PA |
| — | 610-933 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHOENIXVL | PA |
| — | 610-934 | 2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PHPHSBZN23 | PA |
| — | 610-935 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHOENIXVL | PA |
| — | 610-937 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA | 6392 | PHPHSBZN30 | PA |
| — | 610-938 | 0XXX1XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN13 | PA |
| — | 610-939 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | READING | PA |
| — | 610-940 | 8XXX which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN31 | PA |
| — | 610-941 | not yet reported which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | PHPHSBZN31 | PA |
| — | 610-942 | 5XXX6XXX8XXX · 2 holders which blocks → | VERIZON PENNSYLVANIA, INC. | 9208 | GLENMOORE | PA |
| — | 610-943 | 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PHPHSBZN31 | 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.