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)10.71.86.0/23

network10.71.86.0/23

broadcast10.71.87.255

first host10.71.86.1

last host10.71.87.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.71.86.0/23

address00001010.01000111.01010110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.01000111.01010110.00000000

broadcast00001010.01000111.01010111.11111111

green = network part, grey = host part

hex0x0a475600

decimal172447232

reverse dns0.86.71.10.in-addr.arpa

ipv4-mapped::ffff:a47:5600

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.71.86.0/29	10.71.86.1 – 10.71.86.6	10.71.86.7
2	10.71.86.8/29	10.71.86.9 – 10.71.86.14	10.71.86.15
3	10.71.86.16/29	10.71.86.17 – 10.71.86.22	10.71.86.23
4	10.71.86.24/29	10.71.86.25 – 10.71.86.30	10.71.86.31
5	10.71.86.32/29	10.71.86.33 – 10.71.86.38	10.71.86.39
6	10.71.86.40/29	10.71.86.41 – 10.71.86.46	10.71.86.47
7	10.71.86.48/29	10.71.86.49 – 10.71.86.54	10.71.86.55
8	10.71.86.56/29	10.71.86.57 – 10.71.86.62	10.71.86.63
9	10.71.86.64/29	10.71.86.65 – 10.71.86.70	10.71.86.71
10	10.71.86.72/29	10.71.86.73 – 10.71.86.78	10.71.86.79
11	10.71.86.80/29	10.71.86.81 – 10.71.86.86	10.71.86.87
12	10.71.86.88/29	10.71.86.89 – 10.71.86.94	10.71.86.95
13	10.71.86.96/29	10.71.86.97 – 10.71.86.102	10.71.86.103
14	10.71.86.104/29	10.71.86.105 – 10.71.86.110	10.71.86.111
15	10.71.86.112/29	10.71.86.113 – 10.71.86.118	10.71.86.119
16	10.71.86.120/29	10.71.86.121 – 10.71.86.126	10.71.86.127
17	10.71.86.128/29	10.71.86.129 – 10.71.86.134	10.71.86.135
18	10.71.86.136/29	10.71.86.137 – 10.71.86.142	10.71.86.143
19	10.71.86.144/29	10.71.86.145 – 10.71.86.150	10.71.86.151
20	10.71.86.152/29	10.71.86.153 – 10.71.86.158	10.71.86.159
21	10.71.86.160/29	10.71.86.161 – 10.71.86.166	10.71.86.167
22	10.71.86.168/29	10.71.86.169 – 10.71.86.174	10.71.86.175
23	10.71.86.176/29	10.71.86.177 – 10.71.86.182	10.71.86.183
24	10.71.86.184/29	10.71.86.185 – 10.71.86.190	10.71.86.191
25	10.71.86.192/29	10.71.86.193 – 10.71.86.198	10.71.86.199
26	10.71.86.200/29	10.71.86.201 – 10.71.86.206	10.71.86.207
27	10.71.86.208/29	10.71.86.209 – 10.71.86.214	10.71.86.215
28	10.71.86.216/29	10.71.86.217 – 10.71.86.222	10.71.86.223
29	10.71.86.224/29	10.71.86.225 – 10.71.86.230	10.71.86.231
30	10.71.86.232/29	10.71.86.233 – 10.71.86.238	10.71.86.239
31	10.71.86.240/29	10.71.86.241 – 10.71.86.246	10.71.86.247
32	10.71.86.248/29	10.71.86.249 – 10.71.86.254	10.71.86.255
33	10.71.87.0/29	10.71.87.1 – 10.71.87.6	10.71.87.7
34	10.71.87.8/29	10.71.87.9 – 10.71.87.14	10.71.87.15
35	10.71.87.16/29	10.71.87.17 – 10.71.87.22	10.71.87.23
36	10.71.87.24/29	10.71.87.25 – 10.71.87.30	10.71.87.31
37	10.71.87.32/29	10.71.87.33 – 10.71.87.38	10.71.87.39
38	10.71.87.40/29	10.71.87.41 – 10.71.87.46	10.71.87.47
39	10.71.87.48/29	10.71.87.49 – 10.71.87.54	10.71.87.55
40	10.71.87.56/29	10.71.87.57 – 10.71.87.62	10.71.87.63
41	10.71.87.64/29	10.71.87.65 – 10.71.87.70	10.71.87.71
42	10.71.87.72/29	10.71.87.73 – 10.71.87.78	10.71.87.79
43	10.71.87.80/29	10.71.87.81 – 10.71.87.86	10.71.87.87
44	10.71.87.88/29	10.71.87.89 – 10.71.87.94	10.71.87.95
45	10.71.87.96/29	10.71.87.97 – 10.71.87.102	10.71.87.103
46	10.71.87.104/29	10.71.87.105 – 10.71.87.110	10.71.87.111
47	10.71.87.112/29	10.71.87.113 – 10.71.87.118	10.71.87.119
48	10.71.87.120/29	10.71.87.121 – 10.71.87.126	10.71.87.127
49	10.71.87.128/29	10.71.87.129 – 10.71.87.134	10.71.87.135
50	10.71.87.136/29	10.71.87.137 – 10.71.87.142	10.71.87.143
51	10.71.87.144/29	10.71.87.145 – 10.71.87.150	10.71.87.151
52	10.71.87.152/29	10.71.87.153 – 10.71.87.158	10.71.87.159
53	10.71.87.160/29	10.71.87.161 – 10.71.87.166	10.71.87.167
54	10.71.87.168/29	10.71.87.169 – 10.71.87.174	10.71.87.175
55	10.71.87.176/29	10.71.87.177 – 10.71.87.182	10.71.87.183
56	10.71.87.184/29	10.71.87.185 – 10.71.87.190	10.71.87.191
57	10.71.87.192/29	10.71.87.193 – 10.71.87.198	10.71.87.199
58	10.71.87.200/29	10.71.87.201 – 10.71.87.206	10.71.87.207
59	10.71.87.208/29	10.71.87.209 – 10.71.87.214	10.71.87.215
60	10.71.87.216/29	10.71.87.217 – 10.71.87.222	10.71.87.223
61	10.71.87.224/29	10.71.87.225 – 10.71.87.230	10.71.87.231
62	10.71.87.232/29	10.71.87.233 – 10.71.87.238	10.71.87.239
63	10.71.87.240/29	10.71.87.241 – 10.71.87.246	10.71.87.247
64	10.71.87.248/29	10.71.87.249 – 10.71.87.254	10.71.87.255

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 /23
/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	1
/24	255.255.255.0	256	254	2 split →
/25	255.255.255.128	128	126	4 split →
/26	255.255.255.192	64	62	8 split →
/27	255.255.255.224	32	30	16 split →
/28	255.255.255.240	16	14	32 split →
/29	255.255.255.248	8	6	64 split →
/30	255.255.255.252	4	2	128 split →
/31	255.255.255.254	2	2	256 split →
/32	255.255.255.255	1	1	512 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 →