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)10.77.85.0/24

network10.77.85.0/24

broadcast10.77.85.255

first host10.77.85.1

last host10.77.85.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.77.85.0/24

address00001010.01001101.01010101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.01001101.01010101.00000000

broadcast00001010.01001101.01010101.11111111

green = network part, grey = host part

hex0x0a4d5500

decimal172840192

reverse dns0.85.77.10.in-addr.arpa

ipv4-mapped::ffff:a4d:5500

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.77.85.0/30	10.77.85.1 – 10.77.85.2	10.77.85.3
2	10.77.85.4/30	10.77.85.5 – 10.77.85.6	10.77.85.7
3	10.77.85.8/30	10.77.85.9 – 10.77.85.10	10.77.85.11
4	10.77.85.12/30	10.77.85.13 – 10.77.85.14	10.77.85.15
5	10.77.85.16/30	10.77.85.17 – 10.77.85.18	10.77.85.19
6	10.77.85.20/30	10.77.85.21 – 10.77.85.22	10.77.85.23
7	10.77.85.24/30	10.77.85.25 – 10.77.85.26	10.77.85.27
8	10.77.85.28/30	10.77.85.29 – 10.77.85.30	10.77.85.31
9	10.77.85.32/30	10.77.85.33 – 10.77.85.34	10.77.85.35
10	10.77.85.36/30	10.77.85.37 – 10.77.85.38	10.77.85.39
11	10.77.85.40/30	10.77.85.41 – 10.77.85.42	10.77.85.43
12	10.77.85.44/30	10.77.85.45 – 10.77.85.46	10.77.85.47
13	10.77.85.48/30	10.77.85.49 – 10.77.85.50	10.77.85.51
14	10.77.85.52/30	10.77.85.53 – 10.77.85.54	10.77.85.55
15	10.77.85.56/30	10.77.85.57 – 10.77.85.58	10.77.85.59
16	10.77.85.60/30	10.77.85.61 – 10.77.85.62	10.77.85.63
17	10.77.85.64/30	10.77.85.65 – 10.77.85.66	10.77.85.67
18	10.77.85.68/30	10.77.85.69 – 10.77.85.70	10.77.85.71
19	10.77.85.72/30	10.77.85.73 – 10.77.85.74	10.77.85.75
20	10.77.85.76/30	10.77.85.77 – 10.77.85.78	10.77.85.79
21	10.77.85.80/30	10.77.85.81 – 10.77.85.82	10.77.85.83
22	10.77.85.84/30	10.77.85.85 – 10.77.85.86	10.77.85.87
23	10.77.85.88/30	10.77.85.89 – 10.77.85.90	10.77.85.91
24	10.77.85.92/30	10.77.85.93 – 10.77.85.94	10.77.85.95
25	10.77.85.96/30	10.77.85.97 – 10.77.85.98	10.77.85.99
26	10.77.85.100/30	10.77.85.101 – 10.77.85.102	10.77.85.103
27	10.77.85.104/30	10.77.85.105 – 10.77.85.106	10.77.85.107
28	10.77.85.108/30	10.77.85.109 – 10.77.85.110	10.77.85.111
29	10.77.85.112/30	10.77.85.113 – 10.77.85.114	10.77.85.115
30	10.77.85.116/30	10.77.85.117 – 10.77.85.118	10.77.85.119
31	10.77.85.120/30	10.77.85.121 – 10.77.85.122	10.77.85.123
32	10.77.85.124/30	10.77.85.125 – 10.77.85.126	10.77.85.127
33	10.77.85.128/30	10.77.85.129 – 10.77.85.130	10.77.85.131
34	10.77.85.132/30	10.77.85.133 – 10.77.85.134	10.77.85.135
35	10.77.85.136/30	10.77.85.137 – 10.77.85.138	10.77.85.139
36	10.77.85.140/30	10.77.85.141 – 10.77.85.142	10.77.85.143
37	10.77.85.144/30	10.77.85.145 – 10.77.85.146	10.77.85.147
38	10.77.85.148/30	10.77.85.149 – 10.77.85.150	10.77.85.151
39	10.77.85.152/30	10.77.85.153 – 10.77.85.154	10.77.85.155
40	10.77.85.156/30	10.77.85.157 – 10.77.85.158	10.77.85.159
41	10.77.85.160/30	10.77.85.161 – 10.77.85.162	10.77.85.163
42	10.77.85.164/30	10.77.85.165 – 10.77.85.166	10.77.85.167
43	10.77.85.168/30	10.77.85.169 – 10.77.85.170	10.77.85.171
44	10.77.85.172/30	10.77.85.173 – 10.77.85.174	10.77.85.175
45	10.77.85.176/30	10.77.85.177 – 10.77.85.178	10.77.85.179
46	10.77.85.180/30	10.77.85.181 – 10.77.85.182	10.77.85.183
47	10.77.85.184/30	10.77.85.185 – 10.77.85.186	10.77.85.187
48	10.77.85.188/30	10.77.85.189 – 10.77.85.190	10.77.85.191
49	10.77.85.192/30	10.77.85.193 – 10.77.85.194	10.77.85.195
50	10.77.85.196/30	10.77.85.197 – 10.77.85.198	10.77.85.199
51	10.77.85.200/30	10.77.85.201 – 10.77.85.202	10.77.85.203
52	10.77.85.204/30	10.77.85.205 – 10.77.85.206	10.77.85.207
53	10.77.85.208/30	10.77.85.209 – 10.77.85.210	10.77.85.211
54	10.77.85.212/30	10.77.85.213 – 10.77.85.214	10.77.85.215
55	10.77.85.216/30	10.77.85.217 – 10.77.85.218	10.77.85.219
56	10.77.85.220/30	10.77.85.221 – 10.77.85.222	10.77.85.223
57	10.77.85.224/30	10.77.85.225 – 10.77.85.226	10.77.85.227
58	10.77.85.228/30	10.77.85.229 – 10.77.85.230	10.77.85.231
59	10.77.85.232/30	10.77.85.233 – 10.77.85.234	10.77.85.235
60	10.77.85.236/30	10.77.85.237 – 10.77.85.238	10.77.85.239
61	10.77.85.240/30	10.77.85.241 – 10.77.85.242	10.77.85.243
62	10.77.85.244/30	10.77.85.245 – 10.77.85.246	10.77.85.247
63	10.77.85.248/30	10.77.85.249 – 10.77.85.250	10.77.85.251
64	10.77.85.252/30	10.77.85.253 – 10.77.85.254	10.77.85.255

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 →