NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

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

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, last 30 days
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 27
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
New assignments by month Oct 2026 Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 518-200 not yet reported which blocks → CONTACT COMMUNICATIONS, INC. 4721 PLATTSBG NY
— 518-201 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K PAULSMITHS NY
— 518-202 2XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 GLEN NY
— 518-203 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 TROY NY
— 518-204 1XXX4XXX5XXX9XXX · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K MOOERS NY
— 518-205 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 HOOSICKFLS NY
— 518-206 1XXX4XXX5XXX9XXX · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K ROUSES PT NY
— 518-207 0XXX2XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 ALBANY NY
— 518-208 1XXX2XXX4XXX7XXX9XXX · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K CHAMPLAIN NY
— 518-209 none assigned yet which blocks → METROPCS, INC. 5562 ALBANY NY
— 518-210 0XXX which blocks → METROPCS, INC. 5562 ALBANY NY
— 518-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NY
— 518-212 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 AMSTERDAM NY
— 518-213 2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 TELECOM OF NEW YORK, LP - NY 8473 COLONIE NY
— 518-214 1XXX4XXX · 2 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K ROTERDMJCT NY
— 518-215 0XXX1XXX4XXX5XXX · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K CHAZY NY
— 518-216 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K CROWNPOINT NY
— 518-217 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → TC SYSTEMS, INC. - NY 7140 ELIZABTHTN 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
— 518-221 none assigned yet which blocks → METROPCS, INC. 5562 ALBANY NY
— 518-223 0XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 GLENSFALLS NY
— 518-224 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GLOVERSVL NY
— 518-225 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ALBANY NY
— 518-226 1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → VERIZON NEW YORK, INC. 9104 SARATOGSPG NY
— 518-228 not yet reported which blocks → SPOK, INC. 6630 COLONIE NY
— 518-229 none assigned yet which blocks → METROPCS, INC. 5562 ALBANY NY
— 518-230 not yet reported which blocks → SPOK, INC. 6630 COLONIE NY
— 518-231 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CENTRALBDG NY
— 518-232 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 GLENSFALLS 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
— 518-236 not yet reported which blocks → CHAMPLAIN TEL. CO. 0077 MOOERS 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
— 518-240 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 BOLTON LDG NY
— 518-241 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. - NY 7140 LAKEPLACID NY
— 518-242 0XXX6XXX7XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. - NY 7140 ALBANY NY
— 518-243 0XXX8XXX · 2 holders which blocks → TC SYSTEMS, INC. - NY 7140 SCHENCTADY NY
— 518-244 0XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 TROY NY
— 518-245 0XXX3XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. - NY 7140 SARATOGSPG NY
— 518-246 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 AMSTERDAM NY
— 518-247 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. - NY 7140 PLATTSBG NY
— 518-248 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ALBANY NY
— 518-249 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 HUDSON NY
— 518-250 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J COLONIE NY
— 518-251 1XXX6XXX7XXX8XXX · 4 holders which blocks → CITIZENS TELECOMM CO OF NY DBA FRONTIER COMM OF NY 0096 NORTHCREEK NY
— 518-252 0XXX1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 CAMBRIDGE NY

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.