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For minimal operation, outbound UDP on port 9993 (and reply packets) should be allowed to ZeroTIer's root servers. Allowing other UDP is ideal since it allows peer to peer connectivity, but these IPs on 9993 are the minimal requirement for ZeroTier to work:

root-ams-01.zerotier.com has address 195.181.173.159
root-ams-01.zerotier.com has IPv6 address 2a02:6ea0:c024::
root-sea-01.zerotier.com has address 50.7.73.34
root-sea-01.zerotier.com has IPv6 address 2001:49f0:d002:6::2
root-mia-01.zerotier.com has address 103.195.103.66
root-mia-01.zerotier.com has IPv6 address 2605:9880:400:c3:254:f2bc:a1f7:19
root-sgp-01.zerotier.com has address 50.7.252.138
root-sgp-01.zerotier.com has IPv6 address 2001:49f0:d0db:2::2
root-alice-sfo-01.zerotier.com has address 107.170.197.14
root-alice-sfo-01.zerotier.com has IPv6 address 2604:a880:1:20::200:e001

These are Amsterdam, Seattle, Miami, and Singapore. SFO still exists to point very old nodes to the newer roots.


We've also created a DNS record:

host root.zerotier.com


These IPs are subject to change and new root points of presence could be added or removed.

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