NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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 443
PAETEC ITEL, LLC 153
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
— 443-216 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J DUNDALK MD
— 443-227 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J PT DEPOSIT MD
— 443-228 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J CHASE MD
— 443-230 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J ODENTON MD
— 443-233 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J VIENNA MD
— 443-234 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J SNOW HILL MD
— 443-238 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J PARKTON MD
— 443-245 2XXX which blocks → PAETEC ITEL, LLC 829J ELKTON MD
— 443-247 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J UNION BDG MD
— 443-256 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J NORTH EAST MD
— 443-270 not yet reported which blocks → PAETEC ITEL, LLC 829J GLENBURNIE MD
— 443-283 not yet reported which blocks → PAETEC ITEL, LLC 829J COLUMBIA MD
— 443-318 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J COCKEYSVL MD
— 443-319 1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J COLUMBIA MD
— 443-321 not yet reported which blocks → PAETEC ITEL, LLC 829J ANNAPOLIS MD
— 443-323 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J SHARPTOWN MD
— 443-325 2XXX3XXX4XXX5XXX6XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J ELLICOTTCY MD
— 443-327 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J ABERDEEN MD
— 443-328 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → PAETEC ITEL, LLC 829J SYKESVILLE MD
— 443-330 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J COCKEYSVL MD
— 443-331 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J TANEYTOWN MD
— 443-338 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J SPARKSGLNC MD
— 443-339 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J SHERWD FOR MD
— 443-342 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J SOLOMONS MD
— 443-347 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J CARDIFF MD
— 443-351 4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J ODENTON MD
— 443-374 1XXX2XXX5XXX7XXX8XXX which blocks → PAETEC ITEL, LLC 829J ABERDEEN MD
— 443-383 0XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J SILVER RUN MD
— 443-384 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J PARKVILLE MD
— 443-409 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J EDGEWOOD MD
— 443-419 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J GLENWOOD MD
— 443-426 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J RANDALLSTN MD
— 443-429 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J WOODLAWN MD
— 443-432 0XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J PRINCEFRCK MD
— 443-451 not yet reported which blocks → PAETEC ITEL, LLC 829J BALTIMORE MD
— 443-459 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J ELKRIDGE MD
— 443-461 4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J PARKVILLE MD
— 443-471 6XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J PIKESVILLE MD
— 443-481 0XXX2XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J ANNAPOLIS MD
— 443-504 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J FALLSTON MD
— 443-508 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → PAETEC ITEL, LLC 829J HAMPSTEAD MD
— 443-514 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J CATONSVL MD
— 443-522 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J REISTERSTN MD
— 443-526 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J HAVREGRACE MD
— 443-530 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J DUNDALK MD
— 443-539 4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J COLUMBIA MD
— 443-541 4XXX5XXX6XXX7XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J COCKEYSVL MD
— 443-549 4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J DUNDALK MD
— 443-561 4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J ELKRIDGE MD
— 443-573 5XXX7XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J BALTIMORE MD

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.