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)10.30.41.0/24

network10.30.41.0/24

broadcast10.30.41.255

first host10.30.41.1

last host10.30.41.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.30.41.0/24

address00001010.00011110.00101001.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00011110.00101001.00000000

broadcast00001010.00011110.00101001.11111111

green = network part, grey = host part

hex0x0a1e2900

decimal169748736

reverse dns0.41.30.10.in-addr.arpa

ipv4-mapped::ffff:a1e:2900

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.30.41.0/30	10.30.41.1 – 10.30.41.2	10.30.41.3
2	10.30.41.4/30	10.30.41.5 – 10.30.41.6	10.30.41.7
3	10.30.41.8/30	10.30.41.9 – 10.30.41.10	10.30.41.11
4	10.30.41.12/30	10.30.41.13 – 10.30.41.14	10.30.41.15
5	10.30.41.16/30	10.30.41.17 – 10.30.41.18	10.30.41.19
6	10.30.41.20/30	10.30.41.21 – 10.30.41.22	10.30.41.23
7	10.30.41.24/30	10.30.41.25 – 10.30.41.26	10.30.41.27
8	10.30.41.28/30	10.30.41.29 – 10.30.41.30	10.30.41.31
9	10.30.41.32/30	10.30.41.33 – 10.30.41.34	10.30.41.35
10	10.30.41.36/30	10.30.41.37 – 10.30.41.38	10.30.41.39
11	10.30.41.40/30	10.30.41.41 – 10.30.41.42	10.30.41.43
12	10.30.41.44/30	10.30.41.45 – 10.30.41.46	10.30.41.47
13	10.30.41.48/30	10.30.41.49 – 10.30.41.50	10.30.41.51
14	10.30.41.52/30	10.30.41.53 – 10.30.41.54	10.30.41.55
15	10.30.41.56/30	10.30.41.57 – 10.30.41.58	10.30.41.59
16	10.30.41.60/30	10.30.41.61 – 10.30.41.62	10.30.41.63
17	10.30.41.64/30	10.30.41.65 – 10.30.41.66	10.30.41.67
18	10.30.41.68/30	10.30.41.69 – 10.30.41.70	10.30.41.71
19	10.30.41.72/30	10.30.41.73 – 10.30.41.74	10.30.41.75
20	10.30.41.76/30	10.30.41.77 – 10.30.41.78	10.30.41.79
21	10.30.41.80/30	10.30.41.81 – 10.30.41.82	10.30.41.83
22	10.30.41.84/30	10.30.41.85 – 10.30.41.86	10.30.41.87
23	10.30.41.88/30	10.30.41.89 – 10.30.41.90	10.30.41.91
24	10.30.41.92/30	10.30.41.93 – 10.30.41.94	10.30.41.95
25	10.30.41.96/30	10.30.41.97 – 10.30.41.98	10.30.41.99
26	10.30.41.100/30	10.30.41.101 – 10.30.41.102	10.30.41.103
27	10.30.41.104/30	10.30.41.105 – 10.30.41.106	10.30.41.107
28	10.30.41.108/30	10.30.41.109 – 10.30.41.110	10.30.41.111
29	10.30.41.112/30	10.30.41.113 – 10.30.41.114	10.30.41.115
30	10.30.41.116/30	10.30.41.117 – 10.30.41.118	10.30.41.119
31	10.30.41.120/30	10.30.41.121 – 10.30.41.122	10.30.41.123
32	10.30.41.124/30	10.30.41.125 – 10.30.41.126	10.30.41.127
33	10.30.41.128/30	10.30.41.129 – 10.30.41.130	10.30.41.131
34	10.30.41.132/30	10.30.41.133 – 10.30.41.134	10.30.41.135
35	10.30.41.136/30	10.30.41.137 – 10.30.41.138	10.30.41.139
36	10.30.41.140/30	10.30.41.141 – 10.30.41.142	10.30.41.143
37	10.30.41.144/30	10.30.41.145 – 10.30.41.146	10.30.41.147
38	10.30.41.148/30	10.30.41.149 – 10.30.41.150	10.30.41.151
39	10.30.41.152/30	10.30.41.153 – 10.30.41.154	10.30.41.155
40	10.30.41.156/30	10.30.41.157 – 10.30.41.158	10.30.41.159
41	10.30.41.160/30	10.30.41.161 – 10.30.41.162	10.30.41.163
42	10.30.41.164/30	10.30.41.165 – 10.30.41.166	10.30.41.167
43	10.30.41.168/30	10.30.41.169 – 10.30.41.170	10.30.41.171
44	10.30.41.172/30	10.30.41.173 – 10.30.41.174	10.30.41.175
45	10.30.41.176/30	10.30.41.177 – 10.30.41.178	10.30.41.179
46	10.30.41.180/30	10.30.41.181 – 10.30.41.182	10.30.41.183
47	10.30.41.184/30	10.30.41.185 – 10.30.41.186	10.30.41.187
48	10.30.41.188/30	10.30.41.189 – 10.30.41.190	10.30.41.191
49	10.30.41.192/30	10.30.41.193 – 10.30.41.194	10.30.41.195
50	10.30.41.196/30	10.30.41.197 – 10.30.41.198	10.30.41.199
51	10.30.41.200/30	10.30.41.201 – 10.30.41.202	10.30.41.203
52	10.30.41.204/30	10.30.41.205 – 10.30.41.206	10.30.41.207
53	10.30.41.208/30	10.30.41.209 – 10.30.41.210	10.30.41.211
54	10.30.41.212/30	10.30.41.213 – 10.30.41.214	10.30.41.215
55	10.30.41.216/30	10.30.41.217 – 10.30.41.218	10.30.41.219
56	10.30.41.220/30	10.30.41.221 – 10.30.41.222	10.30.41.223
57	10.30.41.224/30	10.30.41.225 – 10.30.41.226	10.30.41.227
58	10.30.41.228/30	10.30.41.229 – 10.30.41.230	10.30.41.231
59	10.30.41.232/30	10.30.41.233 – 10.30.41.234	10.30.41.235
60	10.30.41.236/30	10.30.41.237 – 10.30.41.238	10.30.41.239
61	10.30.41.240/30	10.30.41.241 – 10.30.41.242	10.30.41.243
62	10.30.41.244/30	10.30.41.245 – 10.30.41.246	10.30.41.247
63	10.30.41.248/30	10.30.41.249 – 10.30.41.250	10.30.41.251
64	10.30.41.252/30	10.30.41.253 – 10.30.41.254	10.30.41.255

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 →