AS206633 consists of:
Honorable mention: IP over Bluetooth PAN.
The internal network uses 10.147.0.0/16 and occassionally 2a06:e881:108::/48, which is also 1:1 NATed to the dn42 prefix fd42:2606:32f4::/48. A few hosts also have X.25 addresses in the Telebahn network, and GlobalTalk is eventually planned.
Nullroute also encompasses a Kerberos realm intertwined with an LDAP directory, which internal services use for authentication, and which I also use to store miscellaneous information that would go into a Computer Phone Directory.
Depending on mood. I'm willing to set up all kinds of weird connections (be it IPsec or X.25 or Kerberos or whatever), but won't commit to providing a service for extended periods of time. There is no SLA whatsoever.