Learning IPv4

Total IPs	32768	16384	8192	4096	2048	1024	512	256	128	64	32	16	8	4	2	1
Usable IPs	32766	16382	8190	4094	2046	1022	510	254	126	62	30	14	6	2	N/A	N/A
Netmask	/17	/18	/19	/20	/21	/22	/23	/24	/25	/26	/27	/28	/29	/30	/31	/32
Octet	3rd	3rd	3rd	3rd	3rd	3rd	3rd	3rd	4th	4th	4th	4th	4th	4th	4th	4th
Subnet	.128	.192	.224	.240	.248	.252	.254	.255	.128	.192	.224	.240	.248	.252	.254	.255
IPv4	128	64	32	16	8	4	2	1	128	64	32	16	8	4	2	1

192.168.0.0/24 has 256 IP addresses, one of those addresses is allocated to the Network ID, which is the first IP in the given network and another is allocated to the Broadcast, which is the last IP within the given network. Leaving 254 usuable IPv4 addresses.

Network ID: 192.168.0.0
Hosts: 192.168.0.1-254
Broadcast: 192.168.0.255
Subnet: 255.255.255.0

next Network ID: 192.168.1.0

192.168.0.0/30 has 4 IP addresses, one of those addresses is allocated to the Network ID, which is the first IP in the given network and another is allocated to the Broadcast, which is the last IP within the given network. Leaving 2 usuable IPv4 addresses.

Network ID: 192.168.0.0
Hosts: 192.168.0.1-2
Broadcast: 192.168.0.3
Subnet: 255.255.255.252

next Network ID: 192.168.0.4

192.168.0.128/30 has 4 IP addresses, one of those addresses is allocated to the Network ID, which is the first IP in the given network and another is allocated to the Broadcast, which is the last IP within the given network. Leaving 2 usuable IPv4 addresses.

Network ID: 192.168.0.128
Hosts: 192.168.0.129-130
Broadcast: 192.168.0.131
Subnet: 255.255.255.252

next Network ID: 192.168.0.132

192.168.0.0/20 has 4096 IP addresses, one of those addresses is allocated to the Network ID, which is the first IP in the given network and another is allocated to the Broadcast, which is the last IP within the given network. Leaving 4094 usuable IPv4 addresses.

Network ID: 192.168.0.0
Hosts: 192.168.0.1-15.254
Broadcast: 192.168.15.255
Subnet: 255.255.240.0

next Network ID: 192.168.16.0

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