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)10.63.43.0/24

network10.63.43.0/24

broadcast10.63.43.255

first host10.63.43.1

last host10.63.43.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.63.43.0/24

address00001010.00111111.00101011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00111111.00101011.00000000

broadcast00001010.00111111.00101011.11111111

green = network part, grey = host part

hex0x0a3f2b00

decimal171911936

reverse dns0.43.63.10.in-addr.arpa

ipv4-mapped::ffff:a3f:2b00

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.63.43.0/30	10.63.43.1 – 10.63.43.2	10.63.43.3
2	10.63.43.4/30	10.63.43.5 – 10.63.43.6	10.63.43.7
3	10.63.43.8/30	10.63.43.9 – 10.63.43.10	10.63.43.11
4	10.63.43.12/30	10.63.43.13 – 10.63.43.14	10.63.43.15
5	10.63.43.16/30	10.63.43.17 – 10.63.43.18	10.63.43.19
6	10.63.43.20/30	10.63.43.21 – 10.63.43.22	10.63.43.23
7	10.63.43.24/30	10.63.43.25 – 10.63.43.26	10.63.43.27
8	10.63.43.28/30	10.63.43.29 – 10.63.43.30	10.63.43.31
9	10.63.43.32/30	10.63.43.33 – 10.63.43.34	10.63.43.35
10	10.63.43.36/30	10.63.43.37 – 10.63.43.38	10.63.43.39
11	10.63.43.40/30	10.63.43.41 – 10.63.43.42	10.63.43.43
12	10.63.43.44/30	10.63.43.45 – 10.63.43.46	10.63.43.47
13	10.63.43.48/30	10.63.43.49 – 10.63.43.50	10.63.43.51
14	10.63.43.52/30	10.63.43.53 – 10.63.43.54	10.63.43.55
15	10.63.43.56/30	10.63.43.57 – 10.63.43.58	10.63.43.59
16	10.63.43.60/30	10.63.43.61 – 10.63.43.62	10.63.43.63
17	10.63.43.64/30	10.63.43.65 – 10.63.43.66	10.63.43.67
18	10.63.43.68/30	10.63.43.69 – 10.63.43.70	10.63.43.71
19	10.63.43.72/30	10.63.43.73 – 10.63.43.74	10.63.43.75
20	10.63.43.76/30	10.63.43.77 – 10.63.43.78	10.63.43.79
21	10.63.43.80/30	10.63.43.81 – 10.63.43.82	10.63.43.83
22	10.63.43.84/30	10.63.43.85 – 10.63.43.86	10.63.43.87
23	10.63.43.88/30	10.63.43.89 – 10.63.43.90	10.63.43.91
24	10.63.43.92/30	10.63.43.93 – 10.63.43.94	10.63.43.95
25	10.63.43.96/30	10.63.43.97 – 10.63.43.98	10.63.43.99
26	10.63.43.100/30	10.63.43.101 – 10.63.43.102	10.63.43.103
27	10.63.43.104/30	10.63.43.105 – 10.63.43.106	10.63.43.107
28	10.63.43.108/30	10.63.43.109 – 10.63.43.110	10.63.43.111
29	10.63.43.112/30	10.63.43.113 – 10.63.43.114	10.63.43.115
30	10.63.43.116/30	10.63.43.117 – 10.63.43.118	10.63.43.119
31	10.63.43.120/30	10.63.43.121 – 10.63.43.122	10.63.43.123
32	10.63.43.124/30	10.63.43.125 – 10.63.43.126	10.63.43.127
33	10.63.43.128/30	10.63.43.129 – 10.63.43.130	10.63.43.131
34	10.63.43.132/30	10.63.43.133 – 10.63.43.134	10.63.43.135
35	10.63.43.136/30	10.63.43.137 – 10.63.43.138	10.63.43.139
36	10.63.43.140/30	10.63.43.141 – 10.63.43.142	10.63.43.143
37	10.63.43.144/30	10.63.43.145 – 10.63.43.146	10.63.43.147
38	10.63.43.148/30	10.63.43.149 – 10.63.43.150	10.63.43.151
39	10.63.43.152/30	10.63.43.153 – 10.63.43.154	10.63.43.155
40	10.63.43.156/30	10.63.43.157 – 10.63.43.158	10.63.43.159
41	10.63.43.160/30	10.63.43.161 – 10.63.43.162	10.63.43.163
42	10.63.43.164/30	10.63.43.165 – 10.63.43.166	10.63.43.167
43	10.63.43.168/30	10.63.43.169 – 10.63.43.170	10.63.43.171
44	10.63.43.172/30	10.63.43.173 – 10.63.43.174	10.63.43.175
45	10.63.43.176/30	10.63.43.177 – 10.63.43.178	10.63.43.179
46	10.63.43.180/30	10.63.43.181 – 10.63.43.182	10.63.43.183
47	10.63.43.184/30	10.63.43.185 – 10.63.43.186	10.63.43.187
48	10.63.43.188/30	10.63.43.189 – 10.63.43.190	10.63.43.191
49	10.63.43.192/30	10.63.43.193 – 10.63.43.194	10.63.43.195
50	10.63.43.196/30	10.63.43.197 – 10.63.43.198	10.63.43.199
51	10.63.43.200/30	10.63.43.201 – 10.63.43.202	10.63.43.203
52	10.63.43.204/30	10.63.43.205 – 10.63.43.206	10.63.43.207
53	10.63.43.208/30	10.63.43.209 – 10.63.43.210	10.63.43.211
54	10.63.43.212/30	10.63.43.213 – 10.63.43.214	10.63.43.215
55	10.63.43.216/30	10.63.43.217 – 10.63.43.218	10.63.43.219
56	10.63.43.220/30	10.63.43.221 – 10.63.43.222	10.63.43.223
57	10.63.43.224/30	10.63.43.225 – 10.63.43.226	10.63.43.227
58	10.63.43.228/30	10.63.43.229 – 10.63.43.230	10.63.43.231
59	10.63.43.232/30	10.63.43.233 – 10.63.43.234	10.63.43.235
60	10.63.43.236/30	10.63.43.237 – 10.63.43.238	10.63.43.239
61	10.63.43.240/30	10.63.43.241 – 10.63.43.242	10.63.43.243
62	10.63.43.244/30	10.63.43.245 – 10.63.43.246	10.63.43.247
63	10.63.43.248/30	10.63.43.249 – 10.63.43.250	10.63.43.251
64	10.63.43.252/30	10.63.43.253 – 10.63.43.254	10.63.43.255

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 →