# MAC Filter Limitations?

**URL:** <https://forum.sierrawireless.com/t/mac-filter-limitations/8148>\
**Category:** AirLink routers\
**Created:** [August 27, 2015, 3:48pm UTC](https://forum.sierrawireless.com/t/mac-filter-limitations/8148 "2015-08-27T15:48:22Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![avdevich](https://avatars.discourse-cdn.com/v4/letter/a/a3d4f5/32.png) [@avdevich](https://forum.sierrawireless.com/u/avdevich)\
**Post date:** [August 27, 2015, 3:48pm UTC](https://forum.sierrawireless.com/t/mac-filter-limitations/8148/1 "2015-08-27T15:48:22Z")

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Modem: GX440  
ALEOS: 4.4.2.005  
Carrier: AT&T

Looking to implement MAC Filtering. How many MAC addresses will ALEOS 4.4.2 hold?

Stephen R. Avdevich  
Director of Information and Security Technology  
HIPAA Security Officer  
American Ambulance Service, Inc.  
One American Way  
Norwich, Connecticut 06360

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**Author:** ![avdevich](https://avatars.discourse-cdn.com/v4/letter/a/a3d4f5/32.png) [@avdevich](https://forum.sierrawireless.com/u/avdevich)\
**Post date:** [August 27, 2015, 4:03pm UTC](https://forum.sierrawireless.com/t/mac-filter-limitations/8148/2 "2015-08-27T16:03:31Z")

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I found my answer. The limit is 20 addresses.

Can wildcards be used to specify a particular group of MAC’s?

-Stephen