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)10.167.34.0/23

network10.167.34.0/23

broadcast10.167.35.255

first host10.167.34.1

last host10.167.35.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.167.34.0/23

address00001010.10100111.00100010.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.10100111.00100010.00000000

broadcast00001010.10100111.00100011.11111111

green = network part, grey = host part

hex0x0aa72200

decimal178725376

reverse dns0.34.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:2200

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.167.34.0/29	10.167.34.1 – 10.167.34.6	10.167.34.7
2	10.167.34.8/29	10.167.34.9 – 10.167.34.14	10.167.34.15
3	10.167.34.16/29	10.167.34.17 – 10.167.34.22	10.167.34.23
4	10.167.34.24/29	10.167.34.25 – 10.167.34.30	10.167.34.31
5	10.167.34.32/29	10.167.34.33 – 10.167.34.38	10.167.34.39
6	10.167.34.40/29	10.167.34.41 – 10.167.34.46	10.167.34.47
7	10.167.34.48/29	10.167.34.49 – 10.167.34.54	10.167.34.55
8	10.167.34.56/29	10.167.34.57 – 10.167.34.62	10.167.34.63
9	10.167.34.64/29	10.167.34.65 – 10.167.34.70	10.167.34.71
10	10.167.34.72/29	10.167.34.73 – 10.167.34.78	10.167.34.79
11	10.167.34.80/29	10.167.34.81 – 10.167.34.86	10.167.34.87
12	10.167.34.88/29	10.167.34.89 – 10.167.34.94	10.167.34.95
13	10.167.34.96/29	10.167.34.97 – 10.167.34.102	10.167.34.103
14	10.167.34.104/29	10.167.34.105 – 10.167.34.110	10.167.34.111
15	10.167.34.112/29	10.167.34.113 – 10.167.34.118	10.167.34.119
16	10.167.34.120/29	10.167.34.121 – 10.167.34.126	10.167.34.127
17	10.167.34.128/29	10.167.34.129 – 10.167.34.134	10.167.34.135
18	10.167.34.136/29	10.167.34.137 – 10.167.34.142	10.167.34.143
19	10.167.34.144/29	10.167.34.145 – 10.167.34.150	10.167.34.151
20	10.167.34.152/29	10.167.34.153 – 10.167.34.158	10.167.34.159
21	10.167.34.160/29	10.167.34.161 – 10.167.34.166	10.167.34.167
22	10.167.34.168/29	10.167.34.169 – 10.167.34.174	10.167.34.175
23	10.167.34.176/29	10.167.34.177 – 10.167.34.182	10.167.34.183
24	10.167.34.184/29	10.167.34.185 – 10.167.34.190	10.167.34.191
25	10.167.34.192/29	10.167.34.193 – 10.167.34.198	10.167.34.199
26	10.167.34.200/29	10.167.34.201 – 10.167.34.206	10.167.34.207
27	10.167.34.208/29	10.167.34.209 – 10.167.34.214	10.167.34.215
28	10.167.34.216/29	10.167.34.217 – 10.167.34.222	10.167.34.223
29	10.167.34.224/29	10.167.34.225 – 10.167.34.230	10.167.34.231
30	10.167.34.232/29	10.167.34.233 – 10.167.34.238	10.167.34.239
31	10.167.34.240/29	10.167.34.241 – 10.167.34.246	10.167.34.247
32	10.167.34.248/29	10.167.34.249 – 10.167.34.254	10.167.34.255
33	10.167.35.0/29	10.167.35.1 – 10.167.35.6	10.167.35.7
34	10.167.35.8/29	10.167.35.9 – 10.167.35.14	10.167.35.15
35	10.167.35.16/29	10.167.35.17 – 10.167.35.22	10.167.35.23
36	10.167.35.24/29	10.167.35.25 – 10.167.35.30	10.167.35.31
37	10.167.35.32/29	10.167.35.33 – 10.167.35.38	10.167.35.39
38	10.167.35.40/29	10.167.35.41 – 10.167.35.46	10.167.35.47
39	10.167.35.48/29	10.167.35.49 – 10.167.35.54	10.167.35.55
40	10.167.35.56/29	10.167.35.57 – 10.167.35.62	10.167.35.63
41	10.167.35.64/29	10.167.35.65 – 10.167.35.70	10.167.35.71
42	10.167.35.72/29	10.167.35.73 – 10.167.35.78	10.167.35.79
43	10.167.35.80/29	10.167.35.81 – 10.167.35.86	10.167.35.87
44	10.167.35.88/29	10.167.35.89 – 10.167.35.94	10.167.35.95
45	10.167.35.96/29	10.167.35.97 – 10.167.35.102	10.167.35.103
46	10.167.35.104/29	10.167.35.105 – 10.167.35.110	10.167.35.111
47	10.167.35.112/29	10.167.35.113 – 10.167.35.118	10.167.35.119
48	10.167.35.120/29	10.167.35.121 – 10.167.35.126	10.167.35.127
49	10.167.35.128/29	10.167.35.129 – 10.167.35.134	10.167.35.135
50	10.167.35.136/29	10.167.35.137 – 10.167.35.142	10.167.35.143
51	10.167.35.144/29	10.167.35.145 – 10.167.35.150	10.167.35.151
52	10.167.35.152/29	10.167.35.153 – 10.167.35.158	10.167.35.159
53	10.167.35.160/29	10.167.35.161 – 10.167.35.166	10.167.35.167
54	10.167.35.168/29	10.167.35.169 – 10.167.35.174	10.167.35.175
55	10.167.35.176/29	10.167.35.177 – 10.167.35.182	10.167.35.183
56	10.167.35.184/29	10.167.35.185 – 10.167.35.190	10.167.35.191
57	10.167.35.192/29	10.167.35.193 – 10.167.35.198	10.167.35.199
58	10.167.35.200/29	10.167.35.201 – 10.167.35.206	10.167.35.207
59	10.167.35.208/29	10.167.35.209 – 10.167.35.214	10.167.35.215
60	10.167.35.216/29	10.167.35.217 – 10.167.35.222	10.167.35.223
61	10.167.35.224/29	10.167.35.225 – 10.167.35.230	10.167.35.231
62	10.167.35.232/29	10.167.35.233 – 10.167.35.238	10.167.35.239
63	10.167.35.240/29	10.167.35.241 – 10.167.35.246	10.167.35.247
64	10.167.35.248/29	10.167.35.249 – 10.167.35.254	10.167.35.255

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 →