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

MOUNT AYR prefixes in area code 641

NANPA records 4 assigned NXX blocks to rate center MOUNT AYR in area code 641, 0.7% of the 584 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. 4 holders hold those blocks, the largest being IOWA RSA 2 LIMITED PARTNERSHIP DBA CHAT MOBILITY (1), CENTURYLINK COMMUNICATIONS, LLC (1), WINDSTREAM IOWA COMMUNICATIONS, INC. (1). The earliest assignment on record here is 2003-09-25 and the most recent 2017-12-12. 3 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 219 – overlay codes cover the same geography, so a rate center is served by all of them.

4 assigned blocks – 0.7% of 641
4 holders of record
3 of them pooled in 1,000-number lots

Prefixes assigned here

PrefixHolder of recordAssignedPooledIn service
641-234 IOWA RSA 2 LIMITED PARTNERSHIP DBA CHAT MOBILITY 2003-09-25 no yes
641-321 Lumen CENTURYLINK COMMUNICATIONS, LLC 2017-12-12 yes yes
641-464 Windstream WINDSTREAM IOWA COMMUNICATIONS, INC. – yes yes
641-503 Onvoy ONVOY, LLC - IA – 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
IOWA RSA 2 LIMITED PARTNERSHIP DBA CHAT MOBILITY – 1 25%
CENTURYLINK COMMUNICATIONS, LLC Lumen 1 25%
WINDSTREAM IOWA COMMUNICATIONS, INC. Windstream 1 25%
ONVOY, LLC - IA Onvoy 1 25%

Frequently asked

Which prefixes belong to MOUNT AYR in area code 641?

4 blocks: 234, 321, 464, 503. The table above gives the holder of each.

Which carriers have numbers in MOUNT AYR?

IOWA RSA 2 LIMITED PARTNERSHIP DBA CHAT MOBILITY (1 block), CENTURYLINK COMMUNICATIONS, LLC (1 block), WINDSTREAM IOWA COMMUNICATIONS, INC. (1 block), ONVOY, LLC - IA (1 block). These are the holders on record; the carrier actually serving a given number can differ, because numbers move with their owners.

Is MOUNT AYR 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 641

All 584 prefixes in 641