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)10.3.4.128/26

network10.3.4.128/26

broadcast10.3.4.191

first host10.3.4.129

last host10.3.4.190

subnet mask255.255.255.192

wildcard0.0.0.63

addresses64

usable hosts62

classA

ipcalc 10.3.4.128/26

address00001010.00000011.00000100.10000000

subnet mask11111111.11111111.11111111.11000000

network00001010.00000011.00000100.10000000

broadcast00001010.00000011.00000100.10111111

green = network part, grey = host part

hex0x0a030480

decimal167969920

reverse dns128.4.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:480

/26 split into /31 · 32 subnets

close ×

#	network	host range	broadcast
1	10.3.4.128/31	10.3.4.128 – 10.3.4.129	10.3.4.129
2	10.3.4.130/31	10.3.4.130 – 10.3.4.131	10.3.4.131
3	10.3.4.132/31	10.3.4.132 – 10.3.4.133	10.3.4.133
4	10.3.4.134/31	10.3.4.134 – 10.3.4.135	10.3.4.135
5	10.3.4.136/31	10.3.4.136 – 10.3.4.137	10.3.4.137
6	10.3.4.138/31	10.3.4.138 – 10.3.4.139	10.3.4.139
7	10.3.4.140/31	10.3.4.140 – 10.3.4.141	10.3.4.141
8	10.3.4.142/31	10.3.4.142 – 10.3.4.143	10.3.4.143
9	10.3.4.144/31	10.3.4.144 – 10.3.4.145	10.3.4.145
10	10.3.4.146/31	10.3.4.146 – 10.3.4.147	10.3.4.147
11	10.3.4.148/31	10.3.4.148 – 10.3.4.149	10.3.4.149
12	10.3.4.150/31	10.3.4.150 – 10.3.4.151	10.3.4.151
13	10.3.4.152/31	10.3.4.152 – 10.3.4.153	10.3.4.153
14	10.3.4.154/31	10.3.4.154 – 10.3.4.155	10.3.4.155
15	10.3.4.156/31	10.3.4.156 – 10.3.4.157	10.3.4.157
16	10.3.4.158/31	10.3.4.158 – 10.3.4.159	10.3.4.159
17	10.3.4.160/31	10.3.4.160 – 10.3.4.161	10.3.4.161
18	10.3.4.162/31	10.3.4.162 – 10.3.4.163	10.3.4.163
19	10.3.4.164/31	10.3.4.164 – 10.3.4.165	10.3.4.165
20	10.3.4.166/31	10.3.4.166 – 10.3.4.167	10.3.4.167
21	10.3.4.168/31	10.3.4.168 – 10.3.4.169	10.3.4.169
22	10.3.4.170/31	10.3.4.170 – 10.3.4.171	10.3.4.171
23	10.3.4.172/31	10.3.4.172 – 10.3.4.173	10.3.4.173
24	10.3.4.174/31	10.3.4.174 – 10.3.4.175	10.3.4.175
25	10.3.4.176/31	10.3.4.176 – 10.3.4.177	10.3.4.177
26	10.3.4.178/31	10.3.4.178 – 10.3.4.179	10.3.4.179
27	10.3.4.180/31	10.3.4.180 – 10.3.4.181	10.3.4.181
28	10.3.4.182/31	10.3.4.182 – 10.3.4.183	10.3.4.183
29	10.3.4.184/31	10.3.4.184 – 10.3.4.185	10.3.4.185
30	10.3.4.186/31	10.3.4.186 – 10.3.4.187	10.3.4.187
31	10.3.4.188/31	10.3.4.188 – 10.3.4.189	10.3.4.189
32	10.3.4.190/31	10.3.4.190 – 10.3.4.191	10.3.4.191

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 →