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
2001-04-12 918-403 8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 TULSA OK
2001-04-10 918-402 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
2001-04-05 918-806 1XXX2XXX6XXX8XXX which blocks → LEVEL 3 TELECOM OF OKLAHOMA, LLC - OK 7632 BROKENARRW OK
2001-03-26 918-308 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HARTSHORNE OK
2001-03-21 918-277 none assigned yet which blocks → UNITED STATES CELLULAR - OK 6272 TULSA OK
2001-03-21 918-378 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
2001-03-19 918-239 4XXX5XXX6XXX which blocks → CROSS WIRELESS, L.L.C. 148G TAHLEQUAH OK
2001-03-05 918-282 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
2001-03-02 918-214 8XXX which blocks → UNITED STATES CELLULAR - OK 6272 BARTLESVL OK
2001-01-16 918-734 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
— 918-200 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA OK - LLC 530C TULSA OK
— 918-201 0–9 XXXall 10 · 4 holders which blocks → CSC VOICE, LLC 612K WAGONER OK
— 918-202 3XXX4XXX5XXX6XXX8XXX9XXX which blocks → ONVOY, LLC - OK 409F CATOOSA OK
— 918-203 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 FORTGIBSON OK
— 918-204 1XXX2XXX3XXX4XXX8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-205 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - OK 409F COLLINSVL OK
— 918-207 2XXX5XXX6XXX7XXX8XXX9XXX which blocks → SOUTHWESTERN BELL 9533 TAHLEQUAH OK
— 918-208 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SALLISAW OK
— 918-209 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - OK 119F JENKS OK
— 918-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 918-212 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - OK 409F OWASSO OK
— 918-213 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 BARTLESVL OK
— 918-215 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - OK 409F SAND SPG OK
— 918-216 0XXX1XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - OK 409F SAPULPA OK
— 918-217 2XXX4XXX8XXX · 3 holders which blocks → ONVOY, LLC - OK 409F SKIATOOK OK
— 918-218 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - OK 409F SPERRY OK
— 918-219 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 AFTON OK
— 918-220 not yet reported which blocks → SPOK, INC. 6630 MCALESTER OK
— 918-221 0–9 XXXall 10 · 3 holders which blocks → NORTHEAST RURAL SERVICES, INC. - OK 945H TULSA OK
— 918-223 1XXX3XXX4XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 CUSHING OK
— 918-224 not yet reported which blocks → SOUTHWESTERN BELL 9533 SAPULPA OK
— 918-225 not yet reported which blocks → SOUTHWESTERN BELL 9533 CUSHING OK
— 918-227 not yet reported which blocks → SOUTHWESTERN BELL 9533 SAPULPA OK
— 918-228 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - OK 409F ALLUWE OK
— 918-229 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J SPERRY OK
— 918-230 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
— 918-231 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
— 918-232 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
— 918-233 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 SO CHETOPA OK
— 918-234 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-235 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 SALLISAW OK
— 918-237 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-238 0–9 XXXall 10 · 4 holders which blocks → TELNYX LLC 073H MIAMI OK
— 918-241 not yet reported which blocks → SOUTHWESTERN BELL 9533 SAND SPG OK
— 918-242 none assigned yet which blocks → CIMARRON TEL. CO. 1982 PRUE OK
— 918-243 not yet reported which blocks → CIMARRON TEL. CO. 1982 KEYSTONE OK
— 918-244 none assigned yet which blocks → UNITED STATES CELLULAR - OK 6272 VINITA OK
— 918-245 not yet reported which blocks → SOUTHWESTERN BELL 9533 SAND SPG OK
— 918-246 5XXX6XXX7XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 SAND SPG OK
— 918-247 8XXX9XXX · 2 holders which blocks → OKLAHOMA COMMUNICATION SYSTEM, INC. 1984 KELLYVILLE 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.