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)10.149.253.0/24

network10.149.253.0/24

broadcast10.149.253.255

first host10.149.253.1

last host10.149.253.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.149.253.0/24

address00001010.10010101.11111101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10010101.11111101.00000000

broadcast00001010.10010101.11111101.11111111

green = network part, grey = host part

hex0x0a95fd00

decimal177601792

reverse dns0.253.149.10.in-addr.arpa

ipv4-mapped::ffff:a95:fd00

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.149.253.0/30	10.149.253.1 – 10.149.253.2	10.149.253.3
2	10.149.253.4/30	10.149.253.5 – 10.149.253.6	10.149.253.7
3	10.149.253.8/30	10.149.253.9 – 10.149.253.10	10.149.253.11
4	10.149.253.12/30	10.149.253.13 – 10.149.253.14	10.149.253.15
5	10.149.253.16/30	10.149.253.17 – 10.149.253.18	10.149.253.19
6	10.149.253.20/30	10.149.253.21 – 10.149.253.22	10.149.253.23
7	10.149.253.24/30	10.149.253.25 – 10.149.253.26	10.149.253.27
8	10.149.253.28/30	10.149.253.29 – 10.149.253.30	10.149.253.31
9	10.149.253.32/30	10.149.253.33 – 10.149.253.34	10.149.253.35
10	10.149.253.36/30	10.149.253.37 – 10.149.253.38	10.149.253.39
11	10.149.253.40/30	10.149.253.41 – 10.149.253.42	10.149.253.43
12	10.149.253.44/30	10.149.253.45 – 10.149.253.46	10.149.253.47
13	10.149.253.48/30	10.149.253.49 – 10.149.253.50	10.149.253.51
14	10.149.253.52/30	10.149.253.53 – 10.149.253.54	10.149.253.55
15	10.149.253.56/30	10.149.253.57 – 10.149.253.58	10.149.253.59
16	10.149.253.60/30	10.149.253.61 – 10.149.253.62	10.149.253.63
17	10.149.253.64/30	10.149.253.65 – 10.149.253.66	10.149.253.67
18	10.149.253.68/30	10.149.253.69 – 10.149.253.70	10.149.253.71
19	10.149.253.72/30	10.149.253.73 – 10.149.253.74	10.149.253.75
20	10.149.253.76/30	10.149.253.77 – 10.149.253.78	10.149.253.79
21	10.149.253.80/30	10.149.253.81 – 10.149.253.82	10.149.253.83
22	10.149.253.84/30	10.149.253.85 – 10.149.253.86	10.149.253.87
23	10.149.253.88/30	10.149.253.89 – 10.149.253.90	10.149.253.91
24	10.149.253.92/30	10.149.253.93 – 10.149.253.94	10.149.253.95
25	10.149.253.96/30	10.149.253.97 – 10.149.253.98	10.149.253.99
26	10.149.253.100/30	10.149.253.101 – 10.149.253.102	10.149.253.103
27	10.149.253.104/30	10.149.253.105 – 10.149.253.106	10.149.253.107
28	10.149.253.108/30	10.149.253.109 – 10.149.253.110	10.149.253.111
29	10.149.253.112/30	10.149.253.113 – 10.149.253.114	10.149.253.115
30	10.149.253.116/30	10.149.253.117 – 10.149.253.118	10.149.253.119
31	10.149.253.120/30	10.149.253.121 – 10.149.253.122	10.149.253.123
32	10.149.253.124/30	10.149.253.125 – 10.149.253.126	10.149.253.127
33	10.149.253.128/30	10.149.253.129 – 10.149.253.130	10.149.253.131
34	10.149.253.132/30	10.149.253.133 – 10.149.253.134	10.149.253.135
35	10.149.253.136/30	10.149.253.137 – 10.149.253.138	10.149.253.139
36	10.149.253.140/30	10.149.253.141 – 10.149.253.142	10.149.253.143
37	10.149.253.144/30	10.149.253.145 – 10.149.253.146	10.149.253.147
38	10.149.253.148/30	10.149.253.149 – 10.149.253.150	10.149.253.151
39	10.149.253.152/30	10.149.253.153 – 10.149.253.154	10.149.253.155
40	10.149.253.156/30	10.149.253.157 – 10.149.253.158	10.149.253.159
41	10.149.253.160/30	10.149.253.161 – 10.149.253.162	10.149.253.163
42	10.149.253.164/30	10.149.253.165 – 10.149.253.166	10.149.253.167
43	10.149.253.168/30	10.149.253.169 – 10.149.253.170	10.149.253.171
44	10.149.253.172/30	10.149.253.173 – 10.149.253.174	10.149.253.175
45	10.149.253.176/30	10.149.253.177 – 10.149.253.178	10.149.253.179
46	10.149.253.180/30	10.149.253.181 – 10.149.253.182	10.149.253.183
47	10.149.253.184/30	10.149.253.185 – 10.149.253.186	10.149.253.187
48	10.149.253.188/30	10.149.253.189 – 10.149.253.190	10.149.253.191
49	10.149.253.192/30	10.149.253.193 – 10.149.253.194	10.149.253.195
50	10.149.253.196/30	10.149.253.197 – 10.149.253.198	10.149.253.199
51	10.149.253.200/30	10.149.253.201 – 10.149.253.202	10.149.253.203
52	10.149.253.204/30	10.149.253.205 – 10.149.253.206	10.149.253.207
53	10.149.253.208/30	10.149.253.209 – 10.149.253.210	10.149.253.211
54	10.149.253.212/30	10.149.253.213 – 10.149.253.214	10.149.253.215
55	10.149.253.216/30	10.149.253.217 – 10.149.253.218	10.149.253.219
56	10.149.253.220/30	10.149.253.221 – 10.149.253.222	10.149.253.223
57	10.149.253.224/30	10.149.253.225 – 10.149.253.226	10.149.253.227
58	10.149.253.228/30	10.149.253.229 – 10.149.253.230	10.149.253.231
59	10.149.253.232/30	10.149.253.233 – 10.149.253.234	10.149.253.235
60	10.149.253.236/30	10.149.253.237 – 10.149.253.238	10.149.253.239
61	10.149.253.240/30	10.149.253.241 – 10.149.253.242	10.149.253.243
62	10.149.253.244/30	10.149.253.245 – 10.149.253.246	10.149.253.247
63	10.149.253.248/30	10.149.253.249 – 10.149.253.250	10.149.253.251
64	10.149.253.252/30	10.149.253.253 – 10.149.253.254	10.149.253.255

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 →