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)10.1.126.0/23

network10.1.126.0/23

broadcast10.1.127.255

first host10.1.126.1

last host10.1.127.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.1.126.0/23

address00001010.00000001.01111110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000001.01111110.00000000

broadcast00001010.00000001.01111111.11111111

green = network part, grey = host part

hex0x0a017e00

decimal167869952

reverse dns0.126.1.10.in-addr.arpa

ipv4-mapped::ffff:a01:7e00

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.1.126.0/29	10.1.126.1 – 10.1.126.6	10.1.126.7
2	10.1.126.8/29	10.1.126.9 – 10.1.126.14	10.1.126.15
3	10.1.126.16/29	10.1.126.17 – 10.1.126.22	10.1.126.23
4	10.1.126.24/29	10.1.126.25 – 10.1.126.30	10.1.126.31
5	10.1.126.32/29	10.1.126.33 – 10.1.126.38	10.1.126.39
6	10.1.126.40/29	10.1.126.41 – 10.1.126.46	10.1.126.47
7	10.1.126.48/29	10.1.126.49 – 10.1.126.54	10.1.126.55
8	10.1.126.56/29	10.1.126.57 – 10.1.126.62	10.1.126.63
9	10.1.126.64/29	10.1.126.65 – 10.1.126.70	10.1.126.71
10	10.1.126.72/29	10.1.126.73 – 10.1.126.78	10.1.126.79
11	10.1.126.80/29	10.1.126.81 – 10.1.126.86	10.1.126.87
12	10.1.126.88/29	10.1.126.89 – 10.1.126.94	10.1.126.95
13	10.1.126.96/29	10.1.126.97 – 10.1.126.102	10.1.126.103
14	10.1.126.104/29	10.1.126.105 – 10.1.126.110	10.1.126.111
15	10.1.126.112/29	10.1.126.113 – 10.1.126.118	10.1.126.119
16	10.1.126.120/29	10.1.126.121 – 10.1.126.126	10.1.126.127
17	10.1.126.128/29	10.1.126.129 – 10.1.126.134	10.1.126.135
18	10.1.126.136/29	10.1.126.137 – 10.1.126.142	10.1.126.143
19	10.1.126.144/29	10.1.126.145 – 10.1.126.150	10.1.126.151
20	10.1.126.152/29	10.1.126.153 – 10.1.126.158	10.1.126.159
21	10.1.126.160/29	10.1.126.161 – 10.1.126.166	10.1.126.167
22	10.1.126.168/29	10.1.126.169 – 10.1.126.174	10.1.126.175
23	10.1.126.176/29	10.1.126.177 – 10.1.126.182	10.1.126.183
24	10.1.126.184/29	10.1.126.185 – 10.1.126.190	10.1.126.191
25	10.1.126.192/29	10.1.126.193 – 10.1.126.198	10.1.126.199
26	10.1.126.200/29	10.1.126.201 – 10.1.126.206	10.1.126.207
27	10.1.126.208/29	10.1.126.209 – 10.1.126.214	10.1.126.215
28	10.1.126.216/29	10.1.126.217 – 10.1.126.222	10.1.126.223
29	10.1.126.224/29	10.1.126.225 – 10.1.126.230	10.1.126.231
30	10.1.126.232/29	10.1.126.233 – 10.1.126.238	10.1.126.239
31	10.1.126.240/29	10.1.126.241 – 10.1.126.246	10.1.126.247
32	10.1.126.248/29	10.1.126.249 – 10.1.126.254	10.1.126.255
33	10.1.127.0/29	10.1.127.1 – 10.1.127.6	10.1.127.7
34	10.1.127.8/29	10.1.127.9 – 10.1.127.14	10.1.127.15
35	10.1.127.16/29	10.1.127.17 – 10.1.127.22	10.1.127.23
36	10.1.127.24/29	10.1.127.25 – 10.1.127.30	10.1.127.31
37	10.1.127.32/29	10.1.127.33 – 10.1.127.38	10.1.127.39
38	10.1.127.40/29	10.1.127.41 – 10.1.127.46	10.1.127.47
39	10.1.127.48/29	10.1.127.49 – 10.1.127.54	10.1.127.55
40	10.1.127.56/29	10.1.127.57 – 10.1.127.62	10.1.127.63
41	10.1.127.64/29	10.1.127.65 – 10.1.127.70	10.1.127.71
42	10.1.127.72/29	10.1.127.73 – 10.1.127.78	10.1.127.79
43	10.1.127.80/29	10.1.127.81 – 10.1.127.86	10.1.127.87
44	10.1.127.88/29	10.1.127.89 – 10.1.127.94	10.1.127.95
45	10.1.127.96/29	10.1.127.97 – 10.1.127.102	10.1.127.103
46	10.1.127.104/29	10.1.127.105 – 10.1.127.110	10.1.127.111
47	10.1.127.112/29	10.1.127.113 – 10.1.127.118	10.1.127.119
48	10.1.127.120/29	10.1.127.121 – 10.1.127.126	10.1.127.127
49	10.1.127.128/29	10.1.127.129 – 10.1.127.134	10.1.127.135
50	10.1.127.136/29	10.1.127.137 – 10.1.127.142	10.1.127.143
51	10.1.127.144/29	10.1.127.145 – 10.1.127.150	10.1.127.151
52	10.1.127.152/29	10.1.127.153 – 10.1.127.158	10.1.127.159
53	10.1.127.160/29	10.1.127.161 – 10.1.127.166	10.1.127.167
54	10.1.127.168/29	10.1.127.169 – 10.1.127.174	10.1.127.175
55	10.1.127.176/29	10.1.127.177 – 10.1.127.182	10.1.127.183
56	10.1.127.184/29	10.1.127.185 – 10.1.127.190	10.1.127.191
57	10.1.127.192/29	10.1.127.193 – 10.1.127.198	10.1.127.199
58	10.1.127.200/29	10.1.127.201 – 10.1.127.206	10.1.127.207
59	10.1.127.208/29	10.1.127.209 – 10.1.127.214	10.1.127.215
60	10.1.127.216/29	10.1.127.217 – 10.1.127.222	10.1.127.223
61	10.1.127.224/29	10.1.127.225 – 10.1.127.230	10.1.127.231
62	10.1.127.232/29	10.1.127.233 – 10.1.127.238	10.1.127.239
63	10.1.127.240/29	10.1.127.241 – 10.1.127.246	10.1.127.247
64	10.1.127.248/29	10.1.127.249 – 10.1.127.254	10.1.127.255

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 →