This is a common problem with people running more than one subnet. For simplicity-sake home users should only run 1 subnet. A typical scenario, separate subnet is created every time a WIFI router is added. A typical wiring I see very often:
ISP ---> Modem/Router ---> SWITCH ---> WIFI ROUTER ---> LAN.
Most of the clients are "behind" the WIFI router, on LAN. Then a PC is hooked up by the SWITCH. A PC here does not know how to get to LAN. In this scenario, you are advised to reconfigure your WIFI router as Access Point,
HERE.
If this is not your scenario, draw a diagram of all your main pieces, with Make/Model and post. Do another IPCONFIG for one of your other PC and also post.
Here is the results of my ipconfig command for my primary Win to system, The others should be similar
Windows IP Configuration
Host Name . . . . . . . . . . . . : Tom--Desktop
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
Ethernet adapter Ethernet:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Realtek PCIe GBE Family Controller
Physical Address. . . . . . . . . : 8C-89-A5-DB-F3-75
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::cdd8:9217:cabf:deee%11(Preferred)
IPv4 Address. . . . . . . . . . . : 10.0.0.2(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : Tuesday, July 9, 2019 10:06:21 PM
Lease Expires . . . . . . . . . . : Thursday, July 18, 2019 2:48:45 AM
Default Gateway . . . . . . . . . : 10.0.0.1
DHCP Server . . . . . . . . . . . : 10.0.0.1
DHCPv6 IAID . . . . . . . . . . . : 59541925
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-22-45-F6-DD-8C-89-A5-DB-F3-75
DNS Servers . . . . . . . . . . . : 10.0.0.1
NetBIOS over Tcpip. . . . . . . . : Enabled
Ethernet adapter Bluetooth Network Connection:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Bluetooth Device (Personal Area Network)
Physical Address. . . . . . . . . : 00-15-83-16-C0-DC
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
I will have to do some research to map out the whole network.