192.168.0.0/16

Answer

192.168.0.0/16 is the smallest of the three RFC 1918 private ranges: 192.168.0.0 to 192.168.255.255, 65,536 addresses. Home routers almost always hand out a /24 from it, typically 192.168.0.0/24 or 192.168.1.0/24.

192.168.0.0/16 is 65,536 addresses: 192.168.0.0 to 192.168.255.255. 65,534 usable for hosts (the first is the network address, the last is broadcast).

1921100000016810101000000000000000000000

16 network bits 16 host bits

Network: 192.168.0.0
First usable: 192.168.0.1
Last usable: 192.168.255.254
Broadcast: 192.168.255.255
Addresses: 65,536
Usable hosts: 65,534
Netmask: 255.255.0.0
Wildcard (ACL) mask: 0.0.255.255
Historic class: C
Range type: Private network · not routed on the internet

Special-purpose range

Private network 192.168.0.0/16 RFC 1918
The private range most home routers use (192.168.0.x, 192.168.1.x).

Split it into subnets

4 subnets.

Subnet	Usable range	Hosts	Broadcast
`192.168.0.0/18`	`192.168.0.1` – `192.168.63.254`	16,382	`192.168.63.255`
`192.168.64.0/18`	`192.168.64.1` – `192.168.127.254`	16,382	`192.168.127.255`
`192.168.128.0/18`	`192.168.128.1` – `192.168.191.254`	16,382	`192.168.191.255`
`192.168.192.0/18`	`192.168.192.1` – `192.168.255.254`	16,382	`192.168.255.255`

Is this IP in the range?

Range to CIDR blocks

What to know

Because so many home and small-office networks use the same few /24s, 192.168.0.x and 192.168.1.x are the worst choices for any network you might later connect by VPN. Remote workers on 192.168.1.0/24 at home cannot reach an office LAN that also uses 192.168.1.0/24.

If you control the router, pick a less common /24 such as 192.168.73.0/24, or move to a block from 10.0.0.0/8.

Gotchas

192.168.0.0/16 is private, but 192.169.x.x and 192.167.x.x are public addresses.
Docker falls back to 192.168.0.0/16 (in /20 blocks) once its default 172.x pools are used, which can collide with a home LAN.

Related explainers

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