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 581
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 |
|---|---|---|---|---|---|---|
| 2013-08-23 | 581-334 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Matane | — |
| 2013-08-23 | 581-335 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Amqui | — |
| 2013-08-23 | 581-336 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Val-Brillant | — |
| 2013-08-23 | 581-338 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Sainte-Anne-des-Monts | — |
| 2013-08-23 | 581-340 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Saint-Ulric | — |
| 2013-08-23 | 581-341 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Saint-Rene-de-Matane | — |
| 2013-08-23 | 581-342 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Saint-Leon-le-Grand | — |
| 2013-08-23 | 581-344 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Sainte-Felicite | — |
| 2013-08-23 | 581-345 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Sayabec | — |
| 2013-08-23 | 581-347 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Mont-Louis | — |
| 2013-08-22 | 581-391 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Les Mechins | — |
| 2013-08-22 | 581-392 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Lac-au-Saumon | — |
| 2013-08-22 | 581-393 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | La Martre | — |
| 2013-08-22 | 581-394 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Causapscal | — |
| 2013-08-22 | 581-395 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Cap-Chat | — |
| 2013-08-22 | 581-396 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Baie-des-Sables | — |
| 2012-12-14 | 581-271 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Leeds | — |
| 2012-12-14 | 581-272 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Inverness | — |
| 2012-12-14 | 581-330 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Garthby | — |
| 2012-12-14 | 581-331 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | East Broughton | — |
| 2012-12-13 | 581-266 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Black Lake | — |
| 2012-12-13 | 581-267 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Tring Jonction | — |
| 2012-12-13 | 581-268 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Thetford Mines | — |
| 2012-12-13 | 581-269 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Stratford | — |
| 2012-12-13 | 581-270 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | St-Ferdinand-D'Halifax | — |
| 2012-11-12 | 581-422 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Sainte-Agathe-de-Lotbiniere | — |
| 2012-11-12 | 581-423 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Sainte-Henedine | — |
| 2012-11-12 | 581-424 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Sainte-Marie-de-Beauce | — |
| 2012-11-12 | 581-425 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Vallee-Jonction | — |
| 2012-11-12 | 581-426 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Frampton | — |
| 2012-11-12 | 581-427 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Saint-Bernard-de-Dorchester | — |
| 2012-11-12 | 581-428 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Saint-Joseph-de-Beauce | — |
| 2012-11-12 | 581-429 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Saint-Patrice-de-Beaurivage | — |
| 2012-10-18 | 581-294 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Clarke City | — |
| 2012-10-18 | 581-295 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Chevery | — |
| 2012-10-18 | 581-296 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Bonne-Esperance | — |
| 2012-10-18 | 581-297 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Blanc-Sablon | — |
| 2012-10-18 | 581-298 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Baie-Johan-Beetz | — |
| 2012-10-18 | 581-299 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Aguanish | — |
| 2012-10-18 | 581-301 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Tete-a-la-Baleine | — |
| 2012-10-18 | 581-302 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Saint-Augustin (Duplessis) | — |
| 2012-10-18 | 581-303 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Sept-Iles | — |
| 2012-10-18 | 581-304 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Riviere-au-Tonnerre | — |
| 2012-10-17 | 581-284 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Riviere-Saint-Jean | — |
| 2012-10-17 | 581-285 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Port-Cartier | — |
| 2012-10-17 | 581-286 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Port-Menier | — |
| 2012-10-17 | 581-287 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Pentecote | — |
| 2012-10-17 | 581-288 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Natashquan | — |
| 2012-10-17 | 581-289 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Mutton Bay | — |
| 2012-10-17 | 581-290 | not yet reported which blocks → | Telecommunications Xittel Inc | 247F | Moisie | — |
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.