NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 918
SOUTHWESTERN BELL 236
NEW CINGULAR WIRELESS PCS, LLC - IL 93
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 50
T-MOBILE USA, INC. 49
VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 36
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
— 918-303 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - OK 409F PAWNEE OK
— 918-304 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 OKMULGEE OK
— 918-307 not yet reported which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 BROKENARRW OK
— 918-309 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → UNITED STATES CELLULAR - OK 6272 MIAMI OK
— 918-310 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → UNITED STATES CELLULAR - OK 6272 MUSKOGEE OK
— 918-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 918-317 0XXX1XXX3XXX · 3 holders which blocks → ONVOY, LLC - OK 409F BROKENARRW OK
— 918-318 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MCALESTER OK
— 918-319 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HENRYETTA OK
— 918-320 1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MIAMI OK
— 918-321 0XXX2XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 KIEFER OK
— 918-322 0XXX1XXX2XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 KIEFER OK
— 918-323 1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 VINITA OK
— 918-324 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 DEPEW OK
— 918-326 5XXX which blocks → BRIGHTSPEED OF NORTHWEST ARKANSAS, LLC 1142 COLCORD OK
— 918-327 2XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 BARTLESVL OK
— 918-328 0XXX2XXX3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - OK 409F RALSTON OK
— 918-329 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 MCALESTER OK
— 918-330 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 BARTLESVL OK
— 918-331 none assigned yet which blocks → SOUTHWESTERN BELL 9533 BARTLESVL OK
— 918-332 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 BARTLESVL OK
— 918-333 not yet reported which blocks → SOUTHWESTERN BELL 9533 BARTLESVL OK
— 918-334 not yet reported which blocks → CANADIAN VALLEY TEL. CO. 1974 CROWDER OK
— 918-335 not yet reported which blocks → SOUTHWESTERN BELL 9533 BARTLESVL OK
— 918-336 not yet reported which blocks → SOUTHWESTERN BELL 9533 BARTLESVL OK
— 918-337 not yet reported which blocks → SOUTHWESTERN BELL 9533 BARTLESVL OK
— 918-338 6XXX which blocks → SOUTHWESTERN BELL 9533 BARTLESVL OK
— 918-339 not yet reported which blocks → CANADIAN VALLEY TEL. CO. 1974 CANADIAN OK
— 918-340 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 TULSA OK
— 918-341 not yet reported which blocks → SOUTHWESTERN BELL 9533 CLAREMORE OK
— 918-342 not yet reported which blocks → SOUTHWESTERN BELL 9533 CLAREMORE OK
— 918-343 2XXX which blocks → SOUTHWESTERN BELL 9533 CLAREMORE OK
— 918-344 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
— 918-346 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J TULSA OK
— 918-347 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J SAPULPA OK
— 918-349 none assigned yet which blocks → TOTAH COMMUNICATIONS, INC. 2030 SOUTHELGIN OK
— 918-350 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BARTLESVL OK
— 918-351 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → METROPCS, INC. 5562 MUSKOGEE OK
— 918-352 5XXX6XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 DRUMRIGHT OK
— 918-353 6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 JAY OK
— 918-354 not yet reported which blocks → CIMARRON TEL. CO. 1982 OSAGE OK
— 918-355 not yet reported which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 BROKENARRW OK
— 918-356 not yet reported which blocks → CIMARRON TEL. CO. 1982 HALLETT OK
— 918-357 not yet reported which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 BROKENARRW OK
— 918-358 0XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 CLEVELAND OK
— 918-359 not yet reported which blocks → ONVOY, LLC - OK 409F TULSA OK
— 918-360 none assigned yet which blocks → T-MOBILE USA, INC. 6529 MUSKOGEE OK
— 918-361 0XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 TULSA OK
— 918-362 none assigned yet which blocks → ONVOY, LLC - OK 409F BROKENARRW OK
— 918-363 not yet reported which blocks → CIMARRON TEL. CO. 1982 MANNFORD E OK

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.