NumberingData
Verified Nov 1, 2026 · Source: NANPA CO Code Assignment Records

PORTLUDLOW prefixes in area code 360

NANPA records 4 assigned NXX blocks to rate center PORTLUDLOW in area code 360, 0.5% of the 786 blocks assigned in the code. A rate center is the billing geography a block is allocated to – NANPA truncates the name to ten characters, so read it as a NANPA label rather than a town. 3 holders hold those blocks, the largest being QWEST CORPORATION (2), LEVEL 3 COMMUNICATIONS, LLC - WA (1), TELEPORT COMMUNICATIONS AMERICA, LLC - WA (1). The earliest assignment on record here is 2016-01-06 and the most recent 2016-01-06. 4 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots.

4 assigned blocks – 0.5% of 360
3 holders of record
4 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
360-215 Lumen LEVEL 3 COMMUNICATIONS, LLC - WA – yes yes
360-343 AT&T TELEPORT COMMUNICATIONS AMERICA, LLC - WA – yes yes
360-437 Lumen QWEST CORPORATION – yes yes
360-745 Lumen QWEST CORPORATION 2016-01-06 yes yes

The holder is who received the block from the numbering administrator. It is not necessarily the carrier serving a given number: numbers move with their owners, and a pooled block is shared.

Who holds the blocks

HolderBrandBlocksShare here
QWEST CORPORATION Lumen 2 50%
LEVEL 3 COMMUNICATIONS, LLC - WA Lumen 1 25%
TELEPORT COMMUNICATIONS AMERICA, LLC - WA AT&T 1 25%

Frequently asked

Which prefixes belong to PORTLUDLOW in area code 360?

4 blocks: 215, 343, 437, 745. The table above gives the holder of each.

Which carriers have numbers in PORTLUDLOW?

QWEST CORPORATION (2 blocks), LEVEL 3 COMMUNICATIONS, LLC - WA (1 block), TELEPORT COMMUNICATIONS AMERICA, LLC - WA (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is PORTLUDLOW a city?

It is a rate center – the unit NANPA allocates number blocks to. Its name is abbreviated to ten characters and is not necessarily a settlement: we print it as recorded rather than guess at the full name.

Other rate centers in 360

All 786 prefixes in 360