# PB sending UDP packets to 255.255.255.255:1889? **URL:** \ **Category:** Troubleshooting\ **Created:** [August 3, 2021, 8:24pm UTC](https://forum.electromage.com/t/pb-sending-udp-packets-to-255-255-255-255-1889/1451 "2021-08-03T20:24:26Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![mgrusin](https://forum.electromage.com/letter_avatar_proxy/v4/letter/m/47e85d/32.png) [@mgrusin](https://forum.electromage.com/u/mgrusin)\ **Post date:** [August 3, 2021, 8:24pm UTC](https://forum.electromage.com/t/pb-sending-udp-packets-to-255-255-255-255-1889/1451/1 "2021-08-03T20:24:26Z")
I was taking a look at my router’s connections page today and noticed that my Pixelblaze V2 is continuously sending UDP packets to 255.255.255.255:1889. It’s responsive to its web interface. I did have a power outage this morning. I’m not worried but is this normal? Weird? Thanks! ---
**Author:** ![zranger1](https://forum.electromage.com/user_avatar/forum.electromage.com/zranger1/32/301_2.png) [@zranger1](https://forum.electromage.com/u/zranger1)\ **Post date:** [August 3, 2021, 8:41pm UTC](https://forum.electromage.com/t/pb-sending-udp-packets-to-255-255-255-255-1889/1451/2 "2021-08-03T20:41:41Z")
It’s normal – 255.255.255.255 is the “limited broadcast” address - meant to be receivable by all devices on the local network, and port 1889 is Pixelblaze’s discovery/time sync port. The Pixelblaze sends and listens for these packets to enable programs like Firestorm to tightly synchronize clocks between Pixelblazes on a network, which allows synchronization of patterns running on multiple Pixelblazes. ---
**Author:** ![mgrusin](https://forum.electromage.com/letter_avatar_proxy/v4/letter/m/47e85d/32.png) [@mgrusin](https://forum.electromage.com/u/mgrusin)\ **Post date:** [August 3, 2021, 8:53pm UTC](https://forum.electromage.com/t/pb-sending-udp-packets-to-255-255-255-255-1889/1451/3 "2021-08-03T20:53:47Z")
Cool! Thank you very much for the explanation, I appreciate it. Have a great day.