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)10.76.121.0/24

network10.76.121.0/24

broadcast10.76.121.255

first host10.76.121.1

last host10.76.121.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.76.121.0/24

address00001010.01001100.01111001.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01001100.01111001.00000000

broadcast00001010.01001100.01111001.11111111

green = network part, grey = host part

hex0x0a4c7900

decimal172783872

reverse dns0.121.76.10.in-addr.arpa

ipv4-mapped::ffff:a4c:7900

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.76.121.0/30	10.76.121.1 – 10.76.121.2	10.76.121.3
2	10.76.121.4/30	10.76.121.5 – 10.76.121.6	10.76.121.7
3	10.76.121.8/30	10.76.121.9 – 10.76.121.10	10.76.121.11
4	10.76.121.12/30	10.76.121.13 – 10.76.121.14	10.76.121.15
5	10.76.121.16/30	10.76.121.17 – 10.76.121.18	10.76.121.19
6	10.76.121.20/30	10.76.121.21 – 10.76.121.22	10.76.121.23
7	10.76.121.24/30	10.76.121.25 – 10.76.121.26	10.76.121.27
8	10.76.121.28/30	10.76.121.29 – 10.76.121.30	10.76.121.31
9	10.76.121.32/30	10.76.121.33 – 10.76.121.34	10.76.121.35
10	10.76.121.36/30	10.76.121.37 – 10.76.121.38	10.76.121.39
11	10.76.121.40/30	10.76.121.41 – 10.76.121.42	10.76.121.43
12	10.76.121.44/30	10.76.121.45 – 10.76.121.46	10.76.121.47
13	10.76.121.48/30	10.76.121.49 – 10.76.121.50	10.76.121.51
14	10.76.121.52/30	10.76.121.53 – 10.76.121.54	10.76.121.55
15	10.76.121.56/30	10.76.121.57 – 10.76.121.58	10.76.121.59
16	10.76.121.60/30	10.76.121.61 – 10.76.121.62	10.76.121.63
17	10.76.121.64/30	10.76.121.65 – 10.76.121.66	10.76.121.67
18	10.76.121.68/30	10.76.121.69 – 10.76.121.70	10.76.121.71
19	10.76.121.72/30	10.76.121.73 – 10.76.121.74	10.76.121.75
20	10.76.121.76/30	10.76.121.77 – 10.76.121.78	10.76.121.79
21	10.76.121.80/30	10.76.121.81 – 10.76.121.82	10.76.121.83
22	10.76.121.84/30	10.76.121.85 – 10.76.121.86	10.76.121.87
23	10.76.121.88/30	10.76.121.89 – 10.76.121.90	10.76.121.91
24	10.76.121.92/30	10.76.121.93 – 10.76.121.94	10.76.121.95
25	10.76.121.96/30	10.76.121.97 – 10.76.121.98	10.76.121.99
26	10.76.121.100/30	10.76.121.101 – 10.76.121.102	10.76.121.103
27	10.76.121.104/30	10.76.121.105 – 10.76.121.106	10.76.121.107
28	10.76.121.108/30	10.76.121.109 – 10.76.121.110	10.76.121.111
29	10.76.121.112/30	10.76.121.113 – 10.76.121.114	10.76.121.115
30	10.76.121.116/30	10.76.121.117 – 10.76.121.118	10.76.121.119
31	10.76.121.120/30	10.76.121.121 – 10.76.121.122	10.76.121.123
32	10.76.121.124/30	10.76.121.125 – 10.76.121.126	10.76.121.127
33	10.76.121.128/30	10.76.121.129 – 10.76.121.130	10.76.121.131
34	10.76.121.132/30	10.76.121.133 – 10.76.121.134	10.76.121.135
35	10.76.121.136/30	10.76.121.137 – 10.76.121.138	10.76.121.139
36	10.76.121.140/30	10.76.121.141 – 10.76.121.142	10.76.121.143
37	10.76.121.144/30	10.76.121.145 – 10.76.121.146	10.76.121.147
38	10.76.121.148/30	10.76.121.149 – 10.76.121.150	10.76.121.151
39	10.76.121.152/30	10.76.121.153 – 10.76.121.154	10.76.121.155
40	10.76.121.156/30	10.76.121.157 – 10.76.121.158	10.76.121.159
41	10.76.121.160/30	10.76.121.161 – 10.76.121.162	10.76.121.163
42	10.76.121.164/30	10.76.121.165 – 10.76.121.166	10.76.121.167
43	10.76.121.168/30	10.76.121.169 – 10.76.121.170	10.76.121.171
44	10.76.121.172/30	10.76.121.173 – 10.76.121.174	10.76.121.175
45	10.76.121.176/30	10.76.121.177 – 10.76.121.178	10.76.121.179
46	10.76.121.180/30	10.76.121.181 – 10.76.121.182	10.76.121.183
47	10.76.121.184/30	10.76.121.185 – 10.76.121.186	10.76.121.187
48	10.76.121.188/30	10.76.121.189 – 10.76.121.190	10.76.121.191
49	10.76.121.192/30	10.76.121.193 – 10.76.121.194	10.76.121.195
50	10.76.121.196/30	10.76.121.197 – 10.76.121.198	10.76.121.199
51	10.76.121.200/30	10.76.121.201 – 10.76.121.202	10.76.121.203
52	10.76.121.204/30	10.76.121.205 – 10.76.121.206	10.76.121.207
53	10.76.121.208/30	10.76.121.209 – 10.76.121.210	10.76.121.211
54	10.76.121.212/30	10.76.121.213 – 10.76.121.214	10.76.121.215
55	10.76.121.216/30	10.76.121.217 – 10.76.121.218	10.76.121.219
56	10.76.121.220/30	10.76.121.221 – 10.76.121.222	10.76.121.223
57	10.76.121.224/30	10.76.121.225 – 10.76.121.226	10.76.121.227
58	10.76.121.228/30	10.76.121.229 – 10.76.121.230	10.76.121.231
59	10.76.121.232/30	10.76.121.233 – 10.76.121.234	10.76.121.235
60	10.76.121.236/30	10.76.121.237 – 10.76.121.238	10.76.121.239
61	10.76.121.240/30	10.76.121.241 – 10.76.121.242	10.76.121.243
62	10.76.121.244/30	10.76.121.245 – 10.76.121.246	10.76.121.247
63	10.76.121.248/30	10.76.121.249 – 10.76.121.250	10.76.121.251
64	10.76.121.252/30	10.76.121.253 – 10.76.121.254	10.76.121.255

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 →