OS is a read-only String property that represents the Operating System name for the host server as indicated in the resource record. OS will contain one of the standard values described in RFC 1010, including:
- AEGIS
- APOLLO
- BS-2000
- CEDAR
- CGW
- CHRYSALIS
- CMOS
- CMS
- COS
- CPIX
- CTOS
- CTSS
- DCN
- DDNOS
- DOMAIN
- EDX
- ELF
- EMBOS
- EMMOS
- EPOS
- FOONEX
- FUZZ
- GCOS
- GPOS
- HDOS
- IMAGEN
- INTERCOM
- IMPRESS
- INTERLISP
- IOS
- ITS
- LISP
- LISPM
- LOCUS
- MINOS
- MOS
- MPE5
- MSDOS
- MULTICS
- MVS
- MVS/SP
- NEXUS
- NMS
- NONSTOP
- NOS-2
- OS/DDP
- OS4
- OS8d6
- OSX
- PCDOS
- PERQ/OS
- PLI
- PSDOS/MIT
- PRIMOS
- RMX/RDOS
- ROS
- RSX11M
- SATOPS
- SCS
- SIMP
- SWIFT
- TAC
- TANDEM
- TENEX
- TOPS10
- TOPS20
- TP3010
- TRSDOS
- ULTRIX
- UNIX
- UT2D
- V
- VM
- VM/370
- VM/CMS
- VM/SP
- VMS
- VMS/EUNICE
- VRTX
- WAITS
- WANG
- XDE
- XENIX