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)10.2.236.0/23

network10.2.236.0/23

broadcast10.2.237.255

first host10.2.236.1

last host10.2.237.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.236.0/23

address00001010.00000010.11101100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.11101100.00000000

broadcast00001010.00000010.11101101.11111111

green = network part, grey = host part

hex0x0a02ec00

decimal167963648

reverse dns0.236.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:ec00

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.236.0/29	10.2.236.1 – 10.2.236.6	10.2.236.7
2	10.2.236.8/29	10.2.236.9 – 10.2.236.14	10.2.236.15
3	10.2.236.16/29	10.2.236.17 – 10.2.236.22	10.2.236.23
4	10.2.236.24/29	10.2.236.25 – 10.2.236.30	10.2.236.31
5	10.2.236.32/29	10.2.236.33 – 10.2.236.38	10.2.236.39
6	10.2.236.40/29	10.2.236.41 – 10.2.236.46	10.2.236.47
7	10.2.236.48/29	10.2.236.49 – 10.2.236.54	10.2.236.55
8	10.2.236.56/29	10.2.236.57 – 10.2.236.62	10.2.236.63
9	10.2.236.64/29	10.2.236.65 – 10.2.236.70	10.2.236.71
10	10.2.236.72/29	10.2.236.73 – 10.2.236.78	10.2.236.79
11	10.2.236.80/29	10.2.236.81 – 10.2.236.86	10.2.236.87
12	10.2.236.88/29	10.2.236.89 – 10.2.236.94	10.2.236.95
13	10.2.236.96/29	10.2.236.97 – 10.2.236.102	10.2.236.103
14	10.2.236.104/29	10.2.236.105 – 10.2.236.110	10.2.236.111
15	10.2.236.112/29	10.2.236.113 – 10.2.236.118	10.2.236.119
16	10.2.236.120/29	10.2.236.121 – 10.2.236.126	10.2.236.127
17	10.2.236.128/29	10.2.236.129 – 10.2.236.134	10.2.236.135
18	10.2.236.136/29	10.2.236.137 – 10.2.236.142	10.2.236.143
19	10.2.236.144/29	10.2.236.145 – 10.2.236.150	10.2.236.151
20	10.2.236.152/29	10.2.236.153 – 10.2.236.158	10.2.236.159
21	10.2.236.160/29	10.2.236.161 – 10.2.236.166	10.2.236.167
22	10.2.236.168/29	10.2.236.169 – 10.2.236.174	10.2.236.175
23	10.2.236.176/29	10.2.236.177 – 10.2.236.182	10.2.236.183
24	10.2.236.184/29	10.2.236.185 – 10.2.236.190	10.2.236.191
25	10.2.236.192/29	10.2.236.193 – 10.2.236.198	10.2.236.199
26	10.2.236.200/29	10.2.236.201 – 10.2.236.206	10.2.236.207
27	10.2.236.208/29	10.2.236.209 – 10.2.236.214	10.2.236.215
28	10.2.236.216/29	10.2.236.217 – 10.2.236.222	10.2.236.223
29	10.2.236.224/29	10.2.236.225 – 10.2.236.230	10.2.236.231
30	10.2.236.232/29	10.2.236.233 – 10.2.236.238	10.2.236.239
31	10.2.236.240/29	10.2.236.241 – 10.2.236.246	10.2.236.247
32	10.2.236.248/29	10.2.236.249 – 10.2.236.254	10.2.236.255
33	10.2.237.0/29	10.2.237.1 – 10.2.237.6	10.2.237.7
34	10.2.237.8/29	10.2.237.9 – 10.2.237.14	10.2.237.15
35	10.2.237.16/29	10.2.237.17 – 10.2.237.22	10.2.237.23
36	10.2.237.24/29	10.2.237.25 – 10.2.237.30	10.2.237.31
37	10.2.237.32/29	10.2.237.33 – 10.2.237.38	10.2.237.39
38	10.2.237.40/29	10.2.237.41 – 10.2.237.46	10.2.237.47
39	10.2.237.48/29	10.2.237.49 – 10.2.237.54	10.2.237.55
40	10.2.237.56/29	10.2.237.57 – 10.2.237.62	10.2.237.63
41	10.2.237.64/29	10.2.237.65 – 10.2.237.70	10.2.237.71
42	10.2.237.72/29	10.2.237.73 – 10.2.237.78	10.2.237.79
43	10.2.237.80/29	10.2.237.81 – 10.2.237.86	10.2.237.87
44	10.2.237.88/29	10.2.237.89 – 10.2.237.94	10.2.237.95
45	10.2.237.96/29	10.2.237.97 – 10.2.237.102	10.2.237.103
46	10.2.237.104/29	10.2.237.105 – 10.2.237.110	10.2.237.111
47	10.2.237.112/29	10.2.237.113 – 10.2.237.118	10.2.237.119
48	10.2.237.120/29	10.2.237.121 – 10.2.237.126	10.2.237.127
49	10.2.237.128/29	10.2.237.129 – 10.2.237.134	10.2.237.135
50	10.2.237.136/29	10.2.237.137 – 10.2.237.142	10.2.237.143
51	10.2.237.144/29	10.2.237.145 – 10.2.237.150	10.2.237.151
52	10.2.237.152/29	10.2.237.153 – 10.2.237.158	10.2.237.159
53	10.2.237.160/29	10.2.237.161 – 10.2.237.166	10.2.237.167
54	10.2.237.168/29	10.2.237.169 – 10.2.237.174	10.2.237.175
55	10.2.237.176/29	10.2.237.177 – 10.2.237.182	10.2.237.183
56	10.2.237.184/29	10.2.237.185 – 10.2.237.190	10.2.237.191
57	10.2.237.192/29	10.2.237.193 – 10.2.237.198	10.2.237.199
58	10.2.237.200/29	10.2.237.201 – 10.2.237.206	10.2.237.207
59	10.2.237.208/29	10.2.237.209 – 10.2.237.214	10.2.237.215
60	10.2.237.216/29	10.2.237.217 – 10.2.237.222	10.2.237.223
61	10.2.237.224/29	10.2.237.225 – 10.2.237.230	10.2.237.231
62	10.2.237.232/29	10.2.237.233 – 10.2.237.238	10.2.237.239
63	10.2.237.240/29	10.2.237.241 – 10.2.237.246	10.2.237.247
64	10.2.237.248/29	10.2.237.249 – 10.2.237.254	10.2.237.255

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 /23
/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	1
/24	255.255.255.0	256	254	2 split →
/25	255.255.255.128	128	126	4 split →
/26	255.255.255.192	64	62	8 split →
/27	255.255.255.224	32	30	16 split →
/28	255.255.255.240	16	14	32 split →
/29	255.255.255.248	8	6	64 split →
/30	255.255.255.252	4	2	128 split →
/31	255.255.255.254	2	2	256 split →
/32	255.255.255.255	1	1	512 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 →