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)10.0.127.0/24

network10.0.127.0/24

broadcast10.0.127.255

first host10.0.127.1

last host10.0.127.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.127.0/24

address00001010.00000000.01111111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.01111111.00000000

broadcast00001010.00000000.01111111.11111111

green = network part, grey = host part

hex0x0a007f00

decimal167804672

reverse dns0.127.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:7f00

/24 split into /30 · 64 subnets

close ×

#	network	host range	broadcast
1	10.0.127.0/30	10.0.127.1 – 10.0.127.2	10.0.127.3
2	10.0.127.4/30	10.0.127.5 – 10.0.127.6	10.0.127.7
3	10.0.127.8/30	10.0.127.9 – 10.0.127.10	10.0.127.11
4	10.0.127.12/30	10.0.127.13 – 10.0.127.14	10.0.127.15
5	10.0.127.16/30	10.0.127.17 – 10.0.127.18	10.0.127.19
6	10.0.127.20/30	10.0.127.21 – 10.0.127.22	10.0.127.23
7	10.0.127.24/30	10.0.127.25 – 10.0.127.26	10.0.127.27
8	10.0.127.28/30	10.0.127.29 – 10.0.127.30	10.0.127.31
9	10.0.127.32/30	10.0.127.33 – 10.0.127.34	10.0.127.35
10	10.0.127.36/30	10.0.127.37 – 10.0.127.38	10.0.127.39
11	10.0.127.40/30	10.0.127.41 – 10.0.127.42	10.0.127.43
12	10.0.127.44/30	10.0.127.45 – 10.0.127.46	10.0.127.47
13	10.0.127.48/30	10.0.127.49 – 10.0.127.50	10.0.127.51
14	10.0.127.52/30	10.0.127.53 – 10.0.127.54	10.0.127.55
15	10.0.127.56/30	10.0.127.57 – 10.0.127.58	10.0.127.59
16	10.0.127.60/30	10.0.127.61 – 10.0.127.62	10.0.127.63
17	10.0.127.64/30	10.0.127.65 – 10.0.127.66	10.0.127.67
18	10.0.127.68/30	10.0.127.69 – 10.0.127.70	10.0.127.71
19	10.0.127.72/30	10.0.127.73 – 10.0.127.74	10.0.127.75
20	10.0.127.76/30	10.0.127.77 – 10.0.127.78	10.0.127.79
21	10.0.127.80/30	10.0.127.81 – 10.0.127.82	10.0.127.83
22	10.0.127.84/30	10.0.127.85 – 10.0.127.86	10.0.127.87
23	10.0.127.88/30	10.0.127.89 – 10.0.127.90	10.0.127.91
24	10.0.127.92/30	10.0.127.93 – 10.0.127.94	10.0.127.95
25	10.0.127.96/30	10.0.127.97 – 10.0.127.98	10.0.127.99
26	10.0.127.100/30	10.0.127.101 – 10.0.127.102	10.0.127.103
27	10.0.127.104/30	10.0.127.105 – 10.0.127.106	10.0.127.107
28	10.0.127.108/30	10.0.127.109 – 10.0.127.110	10.0.127.111
29	10.0.127.112/30	10.0.127.113 – 10.0.127.114	10.0.127.115
30	10.0.127.116/30	10.0.127.117 – 10.0.127.118	10.0.127.119
31	10.0.127.120/30	10.0.127.121 – 10.0.127.122	10.0.127.123
32	10.0.127.124/30	10.0.127.125 – 10.0.127.126	10.0.127.127
33	10.0.127.128/30	10.0.127.129 – 10.0.127.130	10.0.127.131
34	10.0.127.132/30	10.0.127.133 – 10.0.127.134	10.0.127.135
35	10.0.127.136/30	10.0.127.137 – 10.0.127.138	10.0.127.139
36	10.0.127.140/30	10.0.127.141 – 10.0.127.142	10.0.127.143
37	10.0.127.144/30	10.0.127.145 – 10.0.127.146	10.0.127.147
38	10.0.127.148/30	10.0.127.149 – 10.0.127.150	10.0.127.151
39	10.0.127.152/30	10.0.127.153 – 10.0.127.154	10.0.127.155
40	10.0.127.156/30	10.0.127.157 – 10.0.127.158	10.0.127.159
41	10.0.127.160/30	10.0.127.161 – 10.0.127.162	10.0.127.163
42	10.0.127.164/30	10.0.127.165 – 10.0.127.166	10.0.127.167
43	10.0.127.168/30	10.0.127.169 – 10.0.127.170	10.0.127.171
44	10.0.127.172/30	10.0.127.173 – 10.0.127.174	10.0.127.175
45	10.0.127.176/30	10.0.127.177 – 10.0.127.178	10.0.127.179
46	10.0.127.180/30	10.0.127.181 – 10.0.127.182	10.0.127.183
47	10.0.127.184/30	10.0.127.185 – 10.0.127.186	10.0.127.187
48	10.0.127.188/30	10.0.127.189 – 10.0.127.190	10.0.127.191
49	10.0.127.192/30	10.0.127.193 – 10.0.127.194	10.0.127.195
50	10.0.127.196/30	10.0.127.197 – 10.0.127.198	10.0.127.199
51	10.0.127.200/30	10.0.127.201 – 10.0.127.202	10.0.127.203
52	10.0.127.204/30	10.0.127.205 – 10.0.127.206	10.0.127.207
53	10.0.127.208/30	10.0.127.209 – 10.0.127.210	10.0.127.211
54	10.0.127.212/30	10.0.127.213 – 10.0.127.214	10.0.127.215
55	10.0.127.216/30	10.0.127.217 – 10.0.127.218	10.0.127.219
56	10.0.127.220/30	10.0.127.221 – 10.0.127.222	10.0.127.223
57	10.0.127.224/30	10.0.127.225 – 10.0.127.226	10.0.127.227
58	10.0.127.228/30	10.0.127.229 – 10.0.127.230	10.0.127.231
59	10.0.127.232/30	10.0.127.233 – 10.0.127.234	10.0.127.235
60	10.0.127.236/30	10.0.127.237 – 10.0.127.238	10.0.127.239
61	10.0.127.240/30	10.0.127.241 – 10.0.127.242	10.0.127.243
62	10.0.127.244/30	10.0.127.245 – 10.0.127.246	10.0.127.247
63	10.0.127.248/30	10.0.127.249 – 10.0.127.250	10.0.127.251
64	10.0.127.252/30	10.0.127.253 – 10.0.127.254	10.0.127.255

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 →