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)10.76.25.0/24

network10.76.25.0/24

broadcast10.76.25.255

first host10.76.25.1

last host10.76.25.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.76.25.0/24

address00001010.01001100.00011001.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01001100.00011001.00000000

broadcast00001010.01001100.00011001.11111111

green = network part, grey = host part

hex0x0a4c1900

decimal172759296

reverse dns0.25.76.10.in-addr.arpa

ipv4-mapped::ffff:a4c:1900

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.76.25.0/30	10.76.25.1 – 10.76.25.2	10.76.25.3
2	10.76.25.4/30	10.76.25.5 – 10.76.25.6	10.76.25.7
3	10.76.25.8/30	10.76.25.9 – 10.76.25.10	10.76.25.11
4	10.76.25.12/30	10.76.25.13 – 10.76.25.14	10.76.25.15
5	10.76.25.16/30	10.76.25.17 – 10.76.25.18	10.76.25.19
6	10.76.25.20/30	10.76.25.21 – 10.76.25.22	10.76.25.23
7	10.76.25.24/30	10.76.25.25 – 10.76.25.26	10.76.25.27
8	10.76.25.28/30	10.76.25.29 – 10.76.25.30	10.76.25.31
9	10.76.25.32/30	10.76.25.33 – 10.76.25.34	10.76.25.35
10	10.76.25.36/30	10.76.25.37 – 10.76.25.38	10.76.25.39
11	10.76.25.40/30	10.76.25.41 – 10.76.25.42	10.76.25.43
12	10.76.25.44/30	10.76.25.45 – 10.76.25.46	10.76.25.47
13	10.76.25.48/30	10.76.25.49 – 10.76.25.50	10.76.25.51
14	10.76.25.52/30	10.76.25.53 – 10.76.25.54	10.76.25.55
15	10.76.25.56/30	10.76.25.57 – 10.76.25.58	10.76.25.59
16	10.76.25.60/30	10.76.25.61 – 10.76.25.62	10.76.25.63
17	10.76.25.64/30	10.76.25.65 – 10.76.25.66	10.76.25.67
18	10.76.25.68/30	10.76.25.69 – 10.76.25.70	10.76.25.71
19	10.76.25.72/30	10.76.25.73 – 10.76.25.74	10.76.25.75
20	10.76.25.76/30	10.76.25.77 – 10.76.25.78	10.76.25.79
21	10.76.25.80/30	10.76.25.81 – 10.76.25.82	10.76.25.83
22	10.76.25.84/30	10.76.25.85 – 10.76.25.86	10.76.25.87
23	10.76.25.88/30	10.76.25.89 – 10.76.25.90	10.76.25.91
24	10.76.25.92/30	10.76.25.93 – 10.76.25.94	10.76.25.95
25	10.76.25.96/30	10.76.25.97 – 10.76.25.98	10.76.25.99
26	10.76.25.100/30	10.76.25.101 – 10.76.25.102	10.76.25.103
27	10.76.25.104/30	10.76.25.105 – 10.76.25.106	10.76.25.107
28	10.76.25.108/30	10.76.25.109 – 10.76.25.110	10.76.25.111
29	10.76.25.112/30	10.76.25.113 – 10.76.25.114	10.76.25.115
30	10.76.25.116/30	10.76.25.117 – 10.76.25.118	10.76.25.119
31	10.76.25.120/30	10.76.25.121 – 10.76.25.122	10.76.25.123
32	10.76.25.124/30	10.76.25.125 – 10.76.25.126	10.76.25.127
33	10.76.25.128/30	10.76.25.129 – 10.76.25.130	10.76.25.131
34	10.76.25.132/30	10.76.25.133 – 10.76.25.134	10.76.25.135
35	10.76.25.136/30	10.76.25.137 – 10.76.25.138	10.76.25.139
36	10.76.25.140/30	10.76.25.141 – 10.76.25.142	10.76.25.143
37	10.76.25.144/30	10.76.25.145 – 10.76.25.146	10.76.25.147
38	10.76.25.148/30	10.76.25.149 – 10.76.25.150	10.76.25.151
39	10.76.25.152/30	10.76.25.153 – 10.76.25.154	10.76.25.155
40	10.76.25.156/30	10.76.25.157 – 10.76.25.158	10.76.25.159
41	10.76.25.160/30	10.76.25.161 – 10.76.25.162	10.76.25.163
42	10.76.25.164/30	10.76.25.165 – 10.76.25.166	10.76.25.167
43	10.76.25.168/30	10.76.25.169 – 10.76.25.170	10.76.25.171
44	10.76.25.172/30	10.76.25.173 – 10.76.25.174	10.76.25.175
45	10.76.25.176/30	10.76.25.177 – 10.76.25.178	10.76.25.179
46	10.76.25.180/30	10.76.25.181 – 10.76.25.182	10.76.25.183
47	10.76.25.184/30	10.76.25.185 – 10.76.25.186	10.76.25.187
48	10.76.25.188/30	10.76.25.189 – 10.76.25.190	10.76.25.191
49	10.76.25.192/30	10.76.25.193 – 10.76.25.194	10.76.25.195
50	10.76.25.196/30	10.76.25.197 – 10.76.25.198	10.76.25.199
51	10.76.25.200/30	10.76.25.201 – 10.76.25.202	10.76.25.203
52	10.76.25.204/30	10.76.25.205 – 10.76.25.206	10.76.25.207
53	10.76.25.208/30	10.76.25.209 – 10.76.25.210	10.76.25.211
54	10.76.25.212/30	10.76.25.213 – 10.76.25.214	10.76.25.215
55	10.76.25.216/30	10.76.25.217 – 10.76.25.218	10.76.25.219
56	10.76.25.220/30	10.76.25.221 – 10.76.25.222	10.76.25.223
57	10.76.25.224/30	10.76.25.225 – 10.76.25.226	10.76.25.227
58	10.76.25.228/30	10.76.25.229 – 10.76.25.230	10.76.25.231
59	10.76.25.232/30	10.76.25.233 – 10.76.25.234	10.76.25.235
60	10.76.25.236/30	10.76.25.237 – 10.76.25.238	10.76.25.239
61	10.76.25.240/30	10.76.25.241 – 10.76.25.242	10.76.25.243
62	10.76.25.244/30	10.76.25.245 – 10.76.25.246	10.76.25.247
63	10.76.25.248/30	10.76.25.249 – 10.76.25.250	10.76.25.251
64	10.76.25.252/30	10.76.25.253 – 10.76.25.254	10.76.25.255

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