NumberResearch Membership · Data 09/21/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

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 518
VERIZON NEW YORK, INC. 225
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2009-04-17 518-621 0–9 XXXall 10 · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 ALBANY NY
2002-04-18 518-379 0XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 SCHENCTADY NY
— 518-218 4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 COLONIE NY
— 518-220 1XXX which blocks → VERIZON NEW YORK, INC. 9104 COLONIE NY
— 518-226 1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 SARATOGSPG NY
— 518-233 4XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 TROY NY
— 518-234 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 COBLESKILL NY
— 518-235 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 TROY NY
— 518-237 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 TROY NY
— 518-238 3XXX5XXX6XXX8XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 TROY NY
— 518-239 0XXX1XXX2XXX3XXX5XXX7XXX · 6 holders which blocks → VERIZON NEW YORK, INC. 9104 OAK HILL NY
— 518-254 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → VERIZON NEW YORK, INC. 9104 COBLESKILL NY
— 518-257 0XXX2XXX6XXX9XXX which blocks → VERIZON NEW YORK, INC. 9104 ALBANY NY
— 518-262 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 ALBANY NY
— 518-263 0XXX1XXX2XXX3XXX6XXX7XXX8XXX · 6 holders which blocks → VERIZON NEW YORK, INC. 9104 HUNTER NY
— 518-266 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 TROY NY
— 518-270 7XXX which blocks → VERIZON NEW YORK, INC. 9104 TROY NY
— 518-271 2XXX which blocks → VERIZON NEW YORK, INC. 9104 TROY NY
— 518-272 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 TROY NY
— 518-273 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 TROY NY
— 518-274 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 TROY NY
— 518-279 2XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 TROY NY
— 518-282 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 HAMPTON NY
— 518-283 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 TROY NY
— 518-284 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 SHARON SPG NY
— 518-285 0XXX1XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 TROY NY
— 518-286 0XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 TROY NY
— 518-293 0XXX2XXX3XXX4XXX5XXX9XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 SARANAC NY
— 518-294 0XXX1XXX3XXX4XXX5XXX7XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 RICHMONDVL NY
— 518-299 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 PRATTSVL NY
— 518-344 0XXX1XXX4XXX6XXX8XXX9XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 SCHENCTADY NY
— 518-346 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SCHENCTADY NY
— 518-347 7XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 SCHENCTADY NY
— 518-348 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 SCHENCTADY NY
— 518-355 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SCHENCTADY NY
— 518-356 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SCHENCTADY NY
— 518-357 3XXX7XXX8XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 SCHENCTADY NY
— 518-358 0XXX1XXX5XXX7XXX8XXX · 5 holders which blocks → VERIZON NEW YORK, INC. 9104 FTCOVINGTN NY
— 518-359 0XXX1XXX5XXX6XXX · 3 holders which blocks → VERIZON NEW YORK, INC. 9104 TUPPERLAKE NY
— 518-363 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON NEW YORK, INC. 9104 BALLSTNSPA NY
— 518-367 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 ALBANY NY
— 518-370 6XXX which blocks → VERIZON NEW YORK, INC. 9104 SCHENCTADY NY
— 518-371 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SCHENCTADY NY
— 518-372 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SCHENCTADY NY
— 518-373 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SCHENCTADY NY
— 518-374 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SCHENCTADY NY
— 518-377 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SCHENCTADY NY
— 518-381 0XXX which blocks → VERIZON NEW YORK, INC. 9104 SCHENCTADY NY
— 518-382 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SCHENCTADY NY
— 518-383 not yet reported which blocks → VERIZON NEW YORK, INC. 9104 SCHENCTADY NY

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.