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

AUMSVLTRNR prefixes in area code 503

NANPA records 3 assigned NXX blocks to rate center AUMSVLTRNR in area code 503, 0.4% of the 784 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. 2 holders hold those blocks, the largest being ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER (2), SCS COMMUNICATIONS AND SECURITY, INC. - OR (1). 2 of them are in thousands-block pooling, so those prefixes are shared between carriers in 1,000-number lots. The same rate center name also appears in area code 971 – overlay codes cover the same geography, so a rate center is served by all of them.

3 assigned blocks – 0.4% of 503
2 holders of record
2 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
503-448 SCS COMMUNICATIONS AND SECURITY, INC. - OR – no yes
503-743 Ziply Fiber ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER – yes yes
503-749 Ziply Fiber ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER – 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
ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER Ziply Fiber 2 66.7%
SCS COMMUNICATIONS AND SECURITY, INC. - OR – 1 33.3%

Frequently asked

Which prefixes belong to AUMSVLTRNR in area code 503?

3 blocks: 448, 743, 749. The table above gives the holder of each.

Which carriers have numbers in AUMSVLTRNR?

ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER (2 blocks), SCS COMMUNICATIONS AND SECURITY, INC. - OR (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is AUMSVLTRNR 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 503

All 784 prefixes in 503