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
— 918-789 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → SOUTHWESTERN BELL 9533 CHELSEA OK
— 918-791 0XXX2XXX3XXX4XXX5XXX6XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 GROVE OK
— 918-793 not yet reported which blocks → SHIDLER TEL. CO. 2023 SHIDLER OK
— 918-794 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → COMCAST IP PHONE, LLC 318J TULSA OK
— 918-796 0XXX1XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → ONVOY, LLC - OK 409F TULSA OK
— 918-797 none assigned yet which blocks → OKLAHOMA WINDSTREAM, INC. 2011 STILWELL OK
— 918-798 none assigned yet which blocks → UNITED STATES CELLULAR - OK 6272 TULSA OK
— 918-799 not yet reported which blocks → CROSS TEL. CO. 1985 ENTERPRISE OK
— 918-801 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GROVE OK
— 918-808 none assigned yet which blocks → T-MOBILE USA, INC. 6529 TULSA OK
— 918-809 none assigned yet which blocks → T-MOBILE USA, INC. 6529 TULSA OK
— 918-810 none assigned yet which blocks → T-MOBILE USA, INC. 6529 TULSA OK
— 918-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 918-812 not yet reported which blocks → T-MOBILE USA, INC. 6529 TULSA OK
— 918-813 4XXX5XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 TULSA OK
— 918-814 1XXX which blocks → T-MOBILE USA, INC. 6529 TULSA OK
— 918-815 1XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 BARTLESVL OK
— 918-816 2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 MUSKOGEE OK
— 918-823 not yet reported which blocks → OKLATEL COMMUNICATIONS, INC. 2013 INDIANOLA OK
— 918-824 0XXX3XXX5XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 PRYOR OK
— 918-825 not yet reported which blocks → SOUTHWESTERN BELL 9533 PRYOR OK
— 918-826 not yet reported which blocks → OKLATEL COMMUNICATIONS, INC. 2013 SCIPIO OK
— 918-827 8XXX9XXX · 2 holders which blocks → OKLAHOMA COMMUNICATION SYSTEM, INC. 1984 MOUNDS OK
— 918-828 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-830 none assigned yet which blocks → T-MOBILE USA, INC. 6529 TULSA OK
— 918-831 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-832 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-833 0XXX1XXX2XXX4XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-834 0XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-835 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-836 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-838 2XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-840 1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MUSKOGEE OK
— 918-841 3XXX4XXX5XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 BARTLESVL OK
— 918-843 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 CHECOTAH OK
— 918-846 not yet reported which blocks → SHIDLER TEL. CO. 2023 WYNONA OK
— 918-847 0XXX which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 BARNSDALL OK
— 918-850 not yet reported which blocks → T-MOBILE USA, INC. 6529 TULSA OK
— 918-851 not yet reported which blocks → T-MOBILE USA, INC. 6529 TULSA OK
— 918-852 not yet reported which blocks → T-MOBILE USA, INC. 6529 TULSA OK
— 918-853 not yet reported which blocks → T-MOBILE USA, INC. 6529 TULSA OK
— 918-854 not yet reported which blocks → OZARK TELEPHONE COMPANY 1866 SOWESTCITY OK
— 918-855 none assigned yet which blocks → UNITED STATES CELLULAR - OK 6272 TULSA OK
— 918-856 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → UNITED STATES CELLULAR - OK 6272 TULSA OK
— 918-857 none assigned yet which blocks → UNITED STATES CELLULAR - OK 6272 TULSA OK
— 918-858 not yet reported which blocks → LEVEL 3 TELECOM OF OKLAHOMA, LLC - OK 7632 TULSA OK
— 918-862 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 OILTON OK
— 918-865 not yet reported which blocks → CIMARRON TEL. CO. 1982 MANNFORD OK
— 918-866 not yet reported which blocks → CENTRAL OKLAHOMA TELEPHONE CO., L.L.C. 1977 SPARKS OK
— 918-867 none assigned yet which blocks → WINDSTREAM OKLAHOMA, INC. 1965 ASHLAND 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.