terminal services license types - tslic

A02-5.00-S - Windows 2000 TS temporary or permanent CAL
A02-5.02-S - Windows 2003 TS temporary or permanent CAT
A02-5.00-EX - Windows 2000 TS CAL from the built-in pool
C50-6.02-S - Windows 2012 or Windows 2012r2
C50-6.00-S - Windows 2008 or Windows 2008r2
C50-10.00-S - ?
C50-10.01-S - ?
C50-10.02-S - ?

tsctst utility

msTSLicenseVersion - 655360
msTSLicenseVersion2 - 7
msTSLicenseVersion3 - C50-10.00-S
msTSLicenseVersion4 - (empty/null at my environment)
msTSMangingLS - server with licensing service installed - source of license - like xxxxx-xxxxx-xxxxx-xxxxx

default ttl dns records on Windows

The 20 minute TTL is default with self update

The default of 20 minutes - set by DWORD named DefaultRegistrationTTL in HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters (the value should be in seconds). A reboot or ipconfig /registerdns.