# how many end devices we can add to a coordinator or router utmost in XBee s2 pro??

**URL:** <https://forums.digi.com/t/how-many-end-devices-we-can-add-to-a-coordinator-or-router-utmost-in-xbee-s2-pro/15479>\
**Category:** XBee - 802.15.4\
**Tags:** pro, s2, xbee\
**Created:** [September 30, 2015, 10:17am UTC](https://forums.digi.com/t/how-many-end-devices-we-can-add-to-a-coordinator-or-router-utmost-in-xbee-s2-pro/15479 "2015-09-30T10:17:51Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![subbanarasaiah](https://avatars.discourse-cdn.com/v4/letter/s/e36b37/32.png) [@subbanarasaiah](https://forums.digi.com/u/subbanarasaiah)\
**Post date:** [September 30, 2015, 10:17am UTC](https://forums.digi.com/t/how-many-end-devices-we-can-add-to-a-coordinator-or-router-utmost-in-xbee-s2-pro/15479/1 "2015-09-30T10:17:51Z")

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why we cant increase the no of end device to big numbers like 50 or 100??  
is there any reason w.r.to 802.15.4??  
or anything else??  
because i am using an application which requires 50 end devices and one coordinator only??  
how can i make it??  
is there any way to achieve it with out using routers in between?? 🙂🙂

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**Author:** ![mvut](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.digi.com/mvut/32/31_2.png) [@mvut](https://forums.digi.com/u/mvut)\
**Post date:** [September 30, 2015, 4:30pm UTC](https://forums.digi.com/t/how-many-end-devices-we-can-add-to-a-coordinator-or-router-utmost-in-xbee-s2-pro/15479/2 "2015-09-30T16:30:41Z")

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What you are describing would be best done under an 802.15.41 network and NOT a zigbee network.

In a Zigbee network, an End device populates a table that is stored in the modules Flash. Since the module has Limited memory, there are only so many entries or End devices you can have.

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<div class="post-metadata">

**Author:** ![subbanarasaiah](https://avatars.discourse-cdn.com/v4/letter/s/e36b37/32.png) [@subbanarasaiah](https://forums.digi.com/u/subbanarasaiah)\
**Post date:** [October 1, 2015, 9:17am UTC](https://forums.digi.com/t/how-many-end-devices-we-can-add-to-a-coordinator-or-router-utmost-in-xbee-s2-pro/15479/3 "2015-10-01T09:17:49Z")

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thanks for your reply but i want to increase no of children by using ZigBee only is there anyway of doing if??

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<div class="post-metadata">

**Author:** ![mvut](https://sea2.discourse-cdn.com/flex016/user_avatar/forums.digi.com/mvut/32/31_2.png) [@mvut](https://forums.digi.com/u/mvut)\
**Post date:** [October 1, 2015, 9:26am UTC](https://forums.digi.com/t/how-many-end-devices-we-can-add-to-a-coordinator-or-router-utmost-in-xbee-s2-pro/15479/4 "2015-10-01T09:26:18Z")

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Without wiring your own firmware, re-certifying with the FCC and CE, it is not possible to increase the number of end device children supported on a XBee ZB coordinator.