# query the upper and lower MAC address on XBee 900HP using SL and SH

**URL:** <https://forums.digi.com/t/query-the-upper-and-lower-mac-address-on-xbee-900hp-using-sl-and-sh/20581>\
**Category:** XBee - DigiMesh\
**Tags:** mac-address, api-mode, xbee\
**Created:** [June 24, 2019, 4:17pm UTC](https://forums.digi.com/t/query-the-upper-and-lower-mac-address-on-xbee-900hp-using-sl-and-sh/20581 "2019-06-24T16:17:15Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![curryte](https://avatars.discourse-cdn.com/v4/letter/c/8edcca/32.png) [@curryte](https://forums.digi.com/u/curryte)\
**Post date:** [June 24, 2019, 4:17pm UTC](https://forums.digi.com/t/query-the-upper-and-lower-mac-address-on-xbee-900hp-using-sl-and-sh/20581/1 "2019-06-24T16:17:15Z")

</div>

I need to request the lower and upper 64 bit MAC address that is on the under side label of the XBEE900HP. I am in API mode, not AT. Here is my attempt but I get back an echo of the original message. Maybe I should be using a different ‘at command’

the entire message is 7e00050801534c:

the breakdown is:  
7e - frame delimter  
00 - len hi  
05 - len lo  
08 - at command (or should I use transmit request 0x10)?  
01 - please ack  
53 - S  
4c - L  
57 - checksum