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)10.129.2.0/24

network10.129.2.0/24

broadcast10.129.2.255

first host10.129.2.1

last host10.129.2.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.129.2.0/24

address00001010.10000001.00000010.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10000001.00000010.00000000

broadcast00001010.10000001.00000010.11111111

green = network part, grey = host part

hex0x0a810200

decimal176226816

reverse dns0.2.129.10.in-addr.arpa

ipv4-mapped::ffff:a81:200

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.129.2.0/30	10.129.2.1 – 10.129.2.2	10.129.2.3
2	10.129.2.4/30	10.129.2.5 – 10.129.2.6	10.129.2.7
3	10.129.2.8/30	10.129.2.9 – 10.129.2.10	10.129.2.11
4	10.129.2.12/30	10.129.2.13 – 10.129.2.14	10.129.2.15
5	10.129.2.16/30	10.129.2.17 – 10.129.2.18	10.129.2.19
6	10.129.2.20/30	10.129.2.21 – 10.129.2.22	10.129.2.23
7	10.129.2.24/30	10.129.2.25 – 10.129.2.26	10.129.2.27
8	10.129.2.28/30	10.129.2.29 – 10.129.2.30	10.129.2.31
9	10.129.2.32/30	10.129.2.33 – 10.129.2.34	10.129.2.35
10	10.129.2.36/30	10.129.2.37 – 10.129.2.38	10.129.2.39
11	10.129.2.40/30	10.129.2.41 – 10.129.2.42	10.129.2.43
12	10.129.2.44/30	10.129.2.45 – 10.129.2.46	10.129.2.47
13	10.129.2.48/30	10.129.2.49 – 10.129.2.50	10.129.2.51
14	10.129.2.52/30	10.129.2.53 – 10.129.2.54	10.129.2.55
15	10.129.2.56/30	10.129.2.57 – 10.129.2.58	10.129.2.59
16	10.129.2.60/30	10.129.2.61 – 10.129.2.62	10.129.2.63
17	10.129.2.64/30	10.129.2.65 – 10.129.2.66	10.129.2.67
18	10.129.2.68/30	10.129.2.69 – 10.129.2.70	10.129.2.71
19	10.129.2.72/30	10.129.2.73 – 10.129.2.74	10.129.2.75
20	10.129.2.76/30	10.129.2.77 – 10.129.2.78	10.129.2.79
21	10.129.2.80/30	10.129.2.81 – 10.129.2.82	10.129.2.83
22	10.129.2.84/30	10.129.2.85 – 10.129.2.86	10.129.2.87
23	10.129.2.88/30	10.129.2.89 – 10.129.2.90	10.129.2.91
24	10.129.2.92/30	10.129.2.93 – 10.129.2.94	10.129.2.95
25	10.129.2.96/30	10.129.2.97 – 10.129.2.98	10.129.2.99
26	10.129.2.100/30	10.129.2.101 – 10.129.2.102	10.129.2.103
27	10.129.2.104/30	10.129.2.105 – 10.129.2.106	10.129.2.107
28	10.129.2.108/30	10.129.2.109 – 10.129.2.110	10.129.2.111
29	10.129.2.112/30	10.129.2.113 – 10.129.2.114	10.129.2.115
30	10.129.2.116/30	10.129.2.117 – 10.129.2.118	10.129.2.119
31	10.129.2.120/30	10.129.2.121 – 10.129.2.122	10.129.2.123
32	10.129.2.124/30	10.129.2.125 – 10.129.2.126	10.129.2.127
33	10.129.2.128/30	10.129.2.129 – 10.129.2.130	10.129.2.131
34	10.129.2.132/30	10.129.2.133 – 10.129.2.134	10.129.2.135
35	10.129.2.136/30	10.129.2.137 – 10.129.2.138	10.129.2.139
36	10.129.2.140/30	10.129.2.141 – 10.129.2.142	10.129.2.143
37	10.129.2.144/30	10.129.2.145 – 10.129.2.146	10.129.2.147
38	10.129.2.148/30	10.129.2.149 – 10.129.2.150	10.129.2.151
39	10.129.2.152/30	10.129.2.153 – 10.129.2.154	10.129.2.155
40	10.129.2.156/30	10.129.2.157 – 10.129.2.158	10.129.2.159
41	10.129.2.160/30	10.129.2.161 – 10.129.2.162	10.129.2.163
42	10.129.2.164/30	10.129.2.165 – 10.129.2.166	10.129.2.167
43	10.129.2.168/30	10.129.2.169 – 10.129.2.170	10.129.2.171
44	10.129.2.172/30	10.129.2.173 – 10.129.2.174	10.129.2.175
45	10.129.2.176/30	10.129.2.177 – 10.129.2.178	10.129.2.179
46	10.129.2.180/30	10.129.2.181 – 10.129.2.182	10.129.2.183
47	10.129.2.184/30	10.129.2.185 – 10.129.2.186	10.129.2.187
48	10.129.2.188/30	10.129.2.189 – 10.129.2.190	10.129.2.191
49	10.129.2.192/30	10.129.2.193 – 10.129.2.194	10.129.2.195
50	10.129.2.196/30	10.129.2.197 – 10.129.2.198	10.129.2.199
51	10.129.2.200/30	10.129.2.201 – 10.129.2.202	10.129.2.203
52	10.129.2.204/30	10.129.2.205 – 10.129.2.206	10.129.2.207
53	10.129.2.208/30	10.129.2.209 – 10.129.2.210	10.129.2.211
54	10.129.2.212/30	10.129.2.213 – 10.129.2.214	10.129.2.215
55	10.129.2.216/30	10.129.2.217 – 10.129.2.218	10.129.2.219
56	10.129.2.220/30	10.129.2.221 – 10.129.2.222	10.129.2.223
57	10.129.2.224/30	10.129.2.225 – 10.129.2.226	10.129.2.227
58	10.129.2.228/30	10.129.2.229 – 10.129.2.230	10.129.2.231
59	10.129.2.232/30	10.129.2.233 – 10.129.2.234	10.129.2.235
60	10.129.2.236/30	10.129.2.237 – 10.129.2.238	10.129.2.239
61	10.129.2.240/30	10.129.2.241 – 10.129.2.242	10.129.2.243
62	10.129.2.244/30	10.129.2.245 – 10.129.2.246	10.129.2.247
63	10.129.2.248/30	10.129.2.249 – 10.129.2.250	10.129.2.251
64	10.129.2.252/30	10.129.2.253 – 10.129.2.254	10.129.2.255

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 →