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)10.2.146.0/23

network10.2.146.0/23

broadcast10.2.147.255

first host10.2.146.1

last host10.2.147.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.146.0/23

address00001010.00000010.10010010.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.10010010.00000000

broadcast00001010.00000010.10010011.11111111

green = network part, grey = host part

hex0x0a029200

decimal167940608

reverse dns0.146.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:9200

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.146.0/29	10.2.146.1 – 10.2.146.6	10.2.146.7
2	10.2.146.8/29	10.2.146.9 – 10.2.146.14	10.2.146.15
3	10.2.146.16/29	10.2.146.17 – 10.2.146.22	10.2.146.23
4	10.2.146.24/29	10.2.146.25 – 10.2.146.30	10.2.146.31
5	10.2.146.32/29	10.2.146.33 – 10.2.146.38	10.2.146.39
6	10.2.146.40/29	10.2.146.41 – 10.2.146.46	10.2.146.47
7	10.2.146.48/29	10.2.146.49 – 10.2.146.54	10.2.146.55
8	10.2.146.56/29	10.2.146.57 – 10.2.146.62	10.2.146.63
9	10.2.146.64/29	10.2.146.65 – 10.2.146.70	10.2.146.71
10	10.2.146.72/29	10.2.146.73 – 10.2.146.78	10.2.146.79
11	10.2.146.80/29	10.2.146.81 – 10.2.146.86	10.2.146.87
12	10.2.146.88/29	10.2.146.89 – 10.2.146.94	10.2.146.95
13	10.2.146.96/29	10.2.146.97 – 10.2.146.102	10.2.146.103
14	10.2.146.104/29	10.2.146.105 – 10.2.146.110	10.2.146.111
15	10.2.146.112/29	10.2.146.113 – 10.2.146.118	10.2.146.119
16	10.2.146.120/29	10.2.146.121 – 10.2.146.126	10.2.146.127
17	10.2.146.128/29	10.2.146.129 – 10.2.146.134	10.2.146.135
18	10.2.146.136/29	10.2.146.137 – 10.2.146.142	10.2.146.143
19	10.2.146.144/29	10.2.146.145 – 10.2.146.150	10.2.146.151
20	10.2.146.152/29	10.2.146.153 – 10.2.146.158	10.2.146.159
21	10.2.146.160/29	10.2.146.161 – 10.2.146.166	10.2.146.167
22	10.2.146.168/29	10.2.146.169 – 10.2.146.174	10.2.146.175
23	10.2.146.176/29	10.2.146.177 – 10.2.146.182	10.2.146.183
24	10.2.146.184/29	10.2.146.185 – 10.2.146.190	10.2.146.191
25	10.2.146.192/29	10.2.146.193 – 10.2.146.198	10.2.146.199
26	10.2.146.200/29	10.2.146.201 – 10.2.146.206	10.2.146.207
27	10.2.146.208/29	10.2.146.209 – 10.2.146.214	10.2.146.215
28	10.2.146.216/29	10.2.146.217 – 10.2.146.222	10.2.146.223
29	10.2.146.224/29	10.2.146.225 – 10.2.146.230	10.2.146.231
30	10.2.146.232/29	10.2.146.233 – 10.2.146.238	10.2.146.239
31	10.2.146.240/29	10.2.146.241 – 10.2.146.246	10.2.146.247
32	10.2.146.248/29	10.2.146.249 – 10.2.146.254	10.2.146.255
33	10.2.147.0/29	10.2.147.1 – 10.2.147.6	10.2.147.7
34	10.2.147.8/29	10.2.147.9 – 10.2.147.14	10.2.147.15
35	10.2.147.16/29	10.2.147.17 – 10.2.147.22	10.2.147.23
36	10.2.147.24/29	10.2.147.25 – 10.2.147.30	10.2.147.31
37	10.2.147.32/29	10.2.147.33 – 10.2.147.38	10.2.147.39
38	10.2.147.40/29	10.2.147.41 – 10.2.147.46	10.2.147.47
39	10.2.147.48/29	10.2.147.49 – 10.2.147.54	10.2.147.55
40	10.2.147.56/29	10.2.147.57 – 10.2.147.62	10.2.147.63
41	10.2.147.64/29	10.2.147.65 – 10.2.147.70	10.2.147.71
42	10.2.147.72/29	10.2.147.73 – 10.2.147.78	10.2.147.79
43	10.2.147.80/29	10.2.147.81 – 10.2.147.86	10.2.147.87
44	10.2.147.88/29	10.2.147.89 – 10.2.147.94	10.2.147.95
45	10.2.147.96/29	10.2.147.97 – 10.2.147.102	10.2.147.103
46	10.2.147.104/29	10.2.147.105 – 10.2.147.110	10.2.147.111
47	10.2.147.112/29	10.2.147.113 – 10.2.147.118	10.2.147.119
48	10.2.147.120/29	10.2.147.121 – 10.2.147.126	10.2.147.127
49	10.2.147.128/29	10.2.147.129 – 10.2.147.134	10.2.147.135
50	10.2.147.136/29	10.2.147.137 – 10.2.147.142	10.2.147.143
51	10.2.147.144/29	10.2.147.145 – 10.2.147.150	10.2.147.151
52	10.2.147.152/29	10.2.147.153 – 10.2.147.158	10.2.147.159
53	10.2.147.160/29	10.2.147.161 – 10.2.147.166	10.2.147.167
54	10.2.147.168/29	10.2.147.169 – 10.2.147.174	10.2.147.175
55	10.2.147.176/29	10.2.147.177 – 10.2.147.182	10.2.147.183
56	10.2.147.184/29	10.2.147.185 – 10.2.147.190	10.2.147.191
57	10.2.147.192/29	10.2.147.193 – 10.2.147.198	10.2.147.199
58	10.2.147.200/29	10.2.147.201 – 10.2.147.206	10.2.147.207
59	10.2.147.208/29	10.2.147.209 – 10.2.147.214	10.2.147.215
60	10.2.147.216/29	10.2.147.217 – 10.2.147.222	10.2.147.223
61	10.2.147.224/29	10.2.147.225 – 10.2.147.230	10.2.147.231
62	10.2.147.232/29	10.2.147.233 – 10.2.147.238	10.2.147.239
63	10.2.147.240/29	10.2.147.241 – 10.2.147.246	10.2.147.247
64	10.2.147.248/29	10.2.147.249 – 10.2.147.254	10.2.147.255

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 →