How to remotely find the server’s vendor, model name etc.?

Using the dmidecode utility:

[john@moon 10:25:45 ~]$ sudo dmidecode -s system-manufacturer

Supermicro

[john@moon 10:25:47 ~]$ sudo dmidecode -s system-product-name

SYS-2028TP-DNCR

[john@moon 10:25:55 ~]$ sudo dmidecode -s system-version

0123456789

[john@moon 10:26:01 ~]$ sudo dmidecode -s baseboard-product-name

X10DRT-P