IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

Try:192.168.1.10/24 10.0.0.0/8 172.16.5.4/20 203.0.113.9/29

IPv6 calculator →

private IP (RFC 1918)10.2.65.128/26

network10.2.65.128/26

broadcast10.2.65.191

first host10.2.65.129

last host10.2.65.190

subnet mask255.255.255.192

wildcard0.0.0.63

addresses64

usable hosts62

classA

ipcalc 10.2.65.128/26

address00001010.00000010.01000001.10000000

subnet mask11111111.11111111.11111111.11000000

network00001010.00000010.01000001.10000000

broadcast00001010.00000010.01000001.10111111

green = network part, grey = host part

hex0x0a024180

decimal167920000

reverse dns128.65.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:4180

/26 split into /32 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.65.128/32	10.2.65.128 – 10.2.65.128	10.2.65.128
2	10.2.65.129/32	10.2.65.129 – 10.2.65.129	10.2.65.129
3	10.2.65.130/32	10.2.65.130 – 10.2.65.130	10.2.65.130
4	10.2.65.131/32	10.2.65.131 – 10.2.65.131	10.2.65.131
5	10.2.65.132/32	10.2.65.132 – 10.2.65.132	10.2.65.132
6	10.2.65.133/32	10.2.65.133 – 10.2.65.133	10.2.65.133
7	10.2.65.134/32	10.2.65.134 – 10.2.65.134	10.2.65.134
8	10.2.65.135/32	10.2.65.135 – 10.2.65.135	10.2.65.135
9	10.2.65.136/32	10.2.65.136 – 10.2.65.136	10.2.65.136
10	10.2.65.137/32	10.2.65.137 – 10.2.65.137	10.2.65.137
11	10.2.65.138/32	10.2.65.138 – 10.2.65.138	10.2.65.138
12	10.2.65.139/32	10.2.65.139 – 10.2.65.139	10.2.65.139
13	10.2.65.140/32	10.2.65.140 – 10.2.65.140	10.2.65.140
14	10.2.65.141/32	10.2.65.141 – 10.2.65.141	10.2.65.141
15	10.2.65.142/32	10.2.65.142 – 10.2.65.142	10.2.65.142
16	10.2.65.143/32	10.2.65.143 – 10.2.65.143	10.2.65.143
17	10.2.65.144/32	10.2.65.144 – 10.2.65.144	10.2.65.144
18	10.2.65.145/32	10.2.65.145 – 10.2.65.145	10.2.65.145
19	10.2.65.146/32	10.2.65.146 – 10.2.65.146	10.2.65.146
20	10.2.65.147/32	10.2.65.147 – 10.2.65.147	10.2.65.147
21	10.2.65.148/32	10.2.65.148 – 10.2.65.148	10.2.65.148
22	10.2.65.149/32	10.2.65.149 – 10.2.65.149	10.2.65.149
23	10.2.65.150/32	10.2.65.150 – 10.2.65.150	10.2.65.150
24	10.2.65.151/32	10.2.65.151 – 10.2.65.151	10.2.65.151
25	10.2.65.152/32	10.2.65.152 – 10.2.65.152	10.2.65.152
26	10.2.65.153/32	10.2.65.153 – 10.2.65.153	10.2.65.153
27	10.2.65.154/32	10.2.65.154 – 10.2.65.154	10.2.65.154
28	10.2.65.155/32	10.2.65.155 – 10.2.65.155	10.2.65.155
29	10.2.65.156/32	10.2.65.156 – 10.2.65.156	10.2.65.156
30	10.2.65.157/32	10.2.65.157 – 10.2.65.157	10.2.65.157
31	10.2.65.158/32	10.2.65.158 – 10.2.65.158	10.2.65.158
32	10.2.65.159/32	10.2.65.159 – 10.2.65.159	10.2.65.159
33	10.2.65.160/32	10.2.65.160 – 10.2.65.160	10.2.65.160
34	10.2.65.161/32	10.2.65.161 – 10.2.65.161	10.2.65.161
35	10.2.65.162/32	10.2.65.162 – 10.2.65.162	10.2.65.162
36	10.2.65.163/32	10.2.65.163 – 10.2.65.163	10.2.65.163
37	10.2.65.164/32	10.2.65.164 – 10.2.65.164	10.2.65.164
38	10.2.65.165/32	10.2.65.165 – 10.2.65.165	10.2.65.165
39	10.2.65.166/32	10.2.65.166 – 10.2.65.166	10.2.65.166
40	10.2.65.167/32	10.2.65.167 – 10.2.65.167	10.2.65.167
41	10.2.65.168/32	10.2.65.168 – 10.2.65.168	10.2.65.168
42	10.2.65.169/32	10.2.65.169 – 10.2.65.169	10.2.65.169
43	10.2.65.170/32	10.2.65.170 – 10.2.65.170	10.2.65.170
44	10.2.65.171/32	10.2.65.171 – 10.2.65.171	10.2.65.171
45	10.2.65.172/32	10.2.65.172 – 10.2.65.172	10.2.65.172
46	10.2.65.173/32	10.2.65.173 – 10.2.65.173	10.2.65.173
47	10.2.65.174/32	10.2.65.174 – 10.2.65.174	10.2.65.174
48	10.2.65.175/32	10.2.65.175 – 10.2.65.175	10.2.65.175
49	10.2.65.176/32	10.2.65.176 – 10.2.65.176	10.2.65.176
50	10.2.65.177/32	10.2.65.177 – 10.2.65.177	10.2.65.177
51	10.2.65.178/32	10.2.65.178 – 10.2.65.178	10.2.65.178
52	10.2.65.179/32	10.2.65.179 – 10.2.65.179	10.2.65.179
53	10.2.65.180/32	10.2.65.180 – 10.2.65.180	10.2.65.180
54	10.2.65.181/32	10.2.65.181 – 10.2.65.181	10.2.65.181
55	10.2.65.182/32	10.2.65.182 – 10.2.65.182	10.2.65.182
56	10.2.65.183/32	10.2.65.183 – 10.2.65.183	10.2.65.183
57	10.2.65.184/32	10.2.65.184 – 10.2.65.184	10.2.65.184
58	10.2.65.185/32	10.2.65.185 – 10.2.65.185	10.2.65.185
59	10.2.65.186/32	10.2.65.186 – 10.2.65.186	10.2.65.186
60	10.2.65.187/32	10.2.65.187 – 10.2.65.187	10.2.65.187
61	10.2.65.188/32	10.2.65.188 – 10.2.65.188	10.2.65.188
62	10.2.65.189/32	10.2.65.189 – 10.2.65.189	10.2.65.189
63	10.2.65.190/32	10.2.65.190 – 10.2.65.190	10.2.65.190
64	10.2.65.191/32	10.2.65.191 – 10.2.65.191	10.2.65.191

01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefix	subnet mask	addresses	hosts	in your /26
/0	0.0.0.0	4,294,967,296	4,294,967,294	-
/1	128.0.0.0	2,147,483,648	2,147,483,646	-
/2	192.0.0.0	1,073,741,824	1,073,741,822	-
/3	224.0.0.0	536,870,912	536,870,910	-
/4	240.0.0.0	268,435,456	268,435,454	-
/5	248.0.0.0	134,217,728	134,217,726	-
/6	252.0.0.0	67,108,864	67,108,862	-
/7	254.0.0.0	33,554,432	33,554,430	-
/8	255.0.0.0	16,777,216	16,777,214	-
/9	255.128.0.0	8,388,608	8,388,606	-
/10	255.192.0.0	4,194,304	4,194,302	-
/11	255.224.0.0	2,097,152	2,097,150	-
/12	255.240.0.0	1,048,576	1,048,574	-
/13	255.248.0.0	524,288	524,286	-
/14	255.252.0.0	262,144	262,142	-
/15	255.254.0.0	131,072	131,070	-
/16	255.255.0.0	65,536	65,534	-
/17	255.255.128.0	32,768	32,766	-
/18	255.255.192.0	16,384	16,382	-
/19	255.255.224.0	8,192	8,190	-
/20	255.255.240.0	4,096	4,094	-
/21	255.255.248.0	2,048	2,046	-
/22	255.255.252.0	1,024	1,022	-
/23	255.255.254.0	512	510	-
/24	255.255.255.0	256	254	-
/25	255.255.255.128	128	126	-
/26	255.255.255.192	64	62	1
/27	255.255.255.224	32	30	2 split →
/28	255.255.255.240	16	14	4 split →
/29	255.255.255.248	8	6	8 split →
/30	255.255.255.252	4	2	16 split →
/31	255.255.255.254	2	2	32 split →
/32	255.255.255.255	1	1	64 split →

02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →