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)10.149.13.0/24

network10.149.13.0/24

broadcast10.149.13.255

first host10.149.13.1

last host10.149.13.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.149.13.0/24

address00001010.10010101.00001101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10010101.00001101.00000000

broadcast00001010.10010101.00001101.11111111

green = network part, grey = host part

hex0x0a950d00

decimal177540352

reverse dns0.13.149.10.in-addr.arpa

ipv4-mapped::ffff:a95:d00

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.149.13.0/30	10.149.13.1 – 10.149.13.2	10.149.13.3
2	10.149.13.4/30	10.149.13.5 – 10.149.13.6	10.149.13.7
3	10.149.13.8/30	10.149.13.9 – 10.149.13.10	10.149.13.11
4	10.149.13.12/30	10.149.13.13 – 10.149.13.14	10.149.13.15
5	10.149.13.16/30	10.149.13.17 – 10.149.13.18	10.149.13.19
6	10.149.13.20/30	10.149.13.21 – 10.149.13.22	10.149.13.23
7	10.149.13.24/30	10.149.13.25 – 10.149.13.26	10.149.13.27
8	10.149.13.28/30	10.149.13.29 – 10.149.13.30	10.149.13.31
9	10.149.13.32/30	10.149.13.33 – 10.149.13.34	10.149.13.35
10	10.149.13.36/30	10.149.13.37 – 10.149.13.38	10.149.13.39
11	10.149.13.40/30	10.149.13.41 – 10.149.13.42	10.149.13.43
12	10.149.13.44/30	10.149.13.45 – 10.149.13.46	10.149.13.47
13	10.149.13.48/30	10.149.13.49 – 10.149.13.50	10.149.13.51
14	10.149.13.52/30	10.149.13.53 – 10.149.13.54	10.149.13.55
15	10.149.13.56/30	10.149.13.57 – 10.149.13.58	10.149.13.59
16	10.149.13.60/30	10.149.13.61 – 10.149.13.62	10.149.13.63
17	10.149.13.64/30	10.149.13.65 – 10.149.13.66	10.149.13.67
18	10.149.13.68/30	10.149.13.69 – 10.149.13.70	10.149.13.71
19	10.149.13.72/30	10.149.13.73 – 10.149.13.74	10.149.13.75
20	10.149.13.76/30	10.149.13.77 – 10.149.13.78	10.149.13.79
21	10.149.13.80/30	10.149.13.81 – 10.149.13.82	10.149.13.83
22	10.149.13.84/30	10.149.13.85 – 10.149.13.86	10.149.13.87
23	10.149.13.88/30	10.149.13.89 – 10.149.13.90	10.149.13.91
24	10.149.13.92/30	10.149.13.93 – 10.149.13.94	10.149.13.95
25	10.149.13.96/30	10.149.13.97 – 10.149.13.98	10.149.13.99
26	10.149.13.100/30	10.149.13.101 – 10.149.13.102	10.149.13.103
27	10.149.13.104/30	10.149.13.105 – 10.149.13.106	10.149.13.107
28	10.149.13.108/30	10.149.13.109 – 10.149.13.110	10.149.13.111
29	10.149.13.112/30	10.149.13.113 – 10.149.13.114	10.149.13.115
30	10.149.13.116/30	10.149.13.117 – 10.149.13.118	10.149.13.119
31	10.149.13.120/30	10.149.13.121 – 10.149.13.122	10.149.13.123
32	10.149.13.124/30	10.149.13.125 – 10.149.13.126	10.149.13.127
33	10.149.13.128/30	10.149.13.129 – 10.149.13.130	10.149.13.131
34	10.149.13.132/30	10.149.13.133 – 10.149.13.134	10.149.13.135
35	10.149.13.136/30	10.149.13.137 – 10.149.13.138	10.149.13.139
36	10.149.13.140/30	10.149.13.141 – 10.149.13.142	10.149.13.143
37	10.149.13.144/30	10.149.13.145 – 10.149.13.146	10.149.13.147
38	10.149.13.148/30	10.149.13.149 – 10.149.13.150	10.149.13.151
39	10.149.13.152/30	10.149.13.153 – 10.149.13.154	10.149.13.155
40	10.149.13.156/30	10.149.13.157 – 10.149.13.158	10.149.13.159
41	10.149.13.160/30	10.149.13.161 – 10.149.13.162	10.149.13.163
42	10.149.13.164/30	10.149.13.165 – 10.149.13.166	10.149.13.167
43	10.149.13.168/30	10.149.13.169 – 10.149.13.170	10.149.13.171
44	10.149.13.172/30	10.149.13.173 – 10.149.13.174	10.149.13.175
45	10.149.13.176/30	10.149.13.177 – 10.149.13.178	10.149.13.179
46	10.149.13.180/30	10.149.13.181 – 10.149.13.182	10.149.13.183
47	10.149.13.184/30	10.149.13.185 – 10.149.13.186	10.149.13.187
48	10.149.13.188/30	10.149.13.189 – 10.149.13.190	10.149.13.191
49	10.149.13.192/30	10.149.13.193 – 10.149.13.194	10.149.13.195
50	10.149.13.196/30	10.149.13.197 – 10.149.13.198	10.149.13.199
51	10.149.13.200/30	10.149.13.201 – 10.149.13.202	10.149.13.203
52	10.149.13.204/30	10.149.13.205 – 10.149.13.206	10.149.13.207
53	10.149.13.208/30	10.149.13.209 – 10.149.13.210	10.149.13.211
54	10.149.13.212/30	10.149.13.213 – 10.149.13.214	10.149.13.215
55	10.149.13.216/30	10.149.13.217 – 10.149.13.218	10.149.13.219
56	10.149.13.220/30	10.149.13.221 – 10.149.13.222	10.149.13.223
57	10.149.13.224/30	10.149.13.225 – 10.149.13.226	10.149.13.227
58	10.149.13.228/30	10.149.13.229 – 10.149.13.230	10.149.13.231
59	10.149.13.232/30	10.149.13.233 – 10.149.13.234	10.149.13.235
60	10.149.13.236/30	10.149.13.237 – 10.149.13.238	10.149.13.239
61	10.149.13.240/30	10.149.13.241 – 10.149.13.242	10.149.13.243
62	10.149.13.244/30	10.149.13.245 – 10.149.13.246	10.149.13.247
63	10.149.13.248/30	10.149.13.249 – 10.149.13.250	10.149.13.251
64	10.149.13.252/30	10.149.13.253 – 10.149.13.254	10.149.13.255

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 →