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)10.4.104.0/23

network10.4.104.0/23

broadcast10.4.105.255

first host10.4.104.1

last host10.4.105.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.4.104.0/23

address00001010.00000100.01101000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000100.01101000.00000000

broadcast00001010.00000100.01101001.11111111

green = network part, grey = host part

hex0x0a046800

decimal168060928

reverse dns0.104.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:6800

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.4.104.0/29	10.4.104.1 – 10.4.104.6	10.4.104.7
2	10.4.104.8/29	10.4.104.9 – 10.4.104.14	10.4.104.15
3	10.4.104.16/29	10.4.104.17 – 10.4.104.22	10.4.104.23
4	10.4.104.24/29	10.4.104.25 – 10.4.104.30	10.4.104.31
5	10.4.104.32/29	10.4.104.33 – 10.4.104.38	10.4.104.39
6	10.4.104.40/29	10.4.104.41 – 10.4.104.46	10.4.104.47
7	10.4.104.48/29	10.4.104.49 – 10.4.104.54	10.4.104.55
8	10.4.104.56/29	10.4.104.57 – 10.4.104.62	10.4.104.63
9	10.4.104.64/29	10.4.104.65 – 10.4.104.70	10.4.104.71
10	10.4.104.72/29	10.4.104.73 – 10.4.104.78	10.4.104.79
11	10.4.104.80/29	10.4.104.81 – 10.4.104.86	10.4.104.87
12	10.4.104.88/29	10.4.104.89 – 10.4.104.94	10.4.104.95
13	10.4.104.96/29	10.4.104.97 – 10.4.104.102	10.4.104.103
14	10.4.104.104/29	10.4.104.105 – 10.4.104.110	10.4.104.111
15	10.4.104.112/29	10.4.104.113 – 10.4.104.118	10.4.104.119
16	10.4.104.120/29	10.4.104.121 – 10.4.104.126	10.4.104.127
17	10.4.104.128/29	10.4.104.129 – 10.4.104.134	10.4.104.135
18	10.4.104.136/29	10.4.104.137 – 10.4.104.142	10.4.104.143
19	10.4.104.144/29	10.4.104.145 – 10.4.104.150	10.4.104.151
20	10.4.104.152/29	10.4.104.153 – 10.4.104.158	10.4.104.159
21	10.4.104.160/29	10.4.104.161 – 10.4.104.166	10.4.104.167
22	10.4.104.168/29	10.4.104.169 – 10.4.104.174	10.4.104.175
23	10.4.104.176/29	10.4.104.177 – 10.4.104.182	10.4.104.183
24	10.4.104.184/29	10.4.104.185 – 10.4.104.190	10.4.104.191
25	10.4.104.192/29	10.4.104.193 – 10.4.104.198	10.4.104.199
26	10.4.104.200/29	10.4.104.201 – 10.4.104.206	10.4.104.207
27	10.4.104.208/29	10.4.104.209 – 10.4.104.214	10.4.104.215
28	10.4.104.216/29	10.4.104.217 – 10.4.104.222	10.4.104.223
29	10.4.104.224/29	10.4.104.225 – 10.4.104.230	10.4.104.231
30	10.4.104.232/29	10.4.104.233 – 10.4.104.238	10.4.104.239
31	10.4.104.240/29	10.4.104.241 – 10.4.104.246	10.4.104.247
32	10.4.104.248/29	10.4.104.249 – 10.4.104.254	10.4.104.255
33	10.4.105.0/29	10.4.105.1 – 10.4.105.6	10.4.105.7
34	10.4.105.8/29	10.4.105.9 – 10.4.105.14	10.4.105.15
35	10.4.105.16/29	10.4.105.17 – 10.4.105.22	10.4.105.23
36	10.4.105.24/29	10.4.105.25 – 10.4.105.30	10.4.105.31
37	10.4.105.32/29	10.4.105.33 – 10.4.105.38	10.4.105.39
38	10.4.105.40/29	10.4.105.41 – 10.4.105.46	10.4.105.47
39	10.4.105.48/29	10.4.105.49 – 10.4.105.54	10.4.105.55
40	10.4.105.56/29	10.4.105.57 – 10.4.105.62	10.4.105.63
41	10.4.105.64/29	10.4.105.65 – 10.4.105.70	10.4.105.71
42	10.4.105.72/29	10.4.105.73 – 10.4.105.78	10.4.105.79
43	10.4.105.80/29	10.4.105.81 – 10.4.105.86	10.4.105.87
44	10.4.105.88/29	10.4.105.89 – 10.4.105.94	10.4.105.95
45	10.4.105.96/29	10.4.105.97 – 10.4.105.102	10.4.105.103
46	10.4.105.104/29	10.4.105.105 – 10.4.105.110	10.4.105.111
47	10.4.105.112/29	10.4.105.113 – 10.4.105.118	10.4.105.119
48	10.4.105.120/29	10.4.105.121 – 10.4.105.126	10.4.105.127
49	10.4.105.128/29	10.4.105.129 – 10.4.105.134	10.4.105.135
50	10.4.105.136/29	10.4.105.137 – 10.4.105.142	10.4.105.143
51	10.4.105.144/29	10.4.105.145 – 10.4.105.150	10.4.105.151
52	10.4.105.152/29	10.4.105.153 – 10.4.105.158	10.4.105.159
53	10.4.105.160/29	10.4.105.161 – 10.4.105.166	10.4.105.167
54	10.4.105.168/29	10.4.105.169 – 10.4.105.174	10.4.105.175
55	10.4.105.176/29	10.4.105.177 – 10.4.105.182	10.4.105.183
56	10.4.105.184/29	10.4.105.185 – 10.4.105.190	10.4.105.191
57	10.4.105.192/29	10.4.105.193 – 10.4.105.198	10.4.105.199
58	10.4.105.200/29	10.4.105.201 – 10.4.105.206	10.4.105.207
59	10.4.105.208/29	10.4.105.209 – 10.4.105.214	10.4.105.215
60	10.4.105.216/29	10.4.105.217 – 10.4.105.222	10.4.105.223
61	10.4.105.224/29	10.4.105.225 – 10.4.105.230	10.4.105.231
62	10.4.105.232/29	10.4.105.233 – 10.4.105.238	10.4.105.239
63	10.4.105.240/29	10.4.105.241 – 10.4.105.246	10.4.105.247
64	10.4.105.248/29	10.4.105.249 – 10.4.105.254	10.4.105.255

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 →