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)10.148.76.0/23

network10.148.76.0/23

broadcast10.148.77.255

first host10.148.76.1

last host10.148.77.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.148.76.0/23

address00001010.10010100.01001100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.10010100.01001100.00000000

broadcast00001010.10010100.01001101.11111111

green = network part, grey = host part

hex0x0a944c00

decimal177490944

reverse dns0.76.148.10.in-addr.arpa

ipv4-mapped::ffff:a94:4c00

/23 split into /29 · 64 subnets

close ×

#	network	host range	broadcast
1	10.148.76.0/29	10.148.76.1 – 10.148.76.6	10.148.76.7
2	10.148.76.8/29	10.148.76.9 – 10.148.76.14	10.148.76.15
3	10.148.76.16/29	10.148.76.17 – 10.148.76.22	10.148.76.23
4	10.148.76.24/29	10.148.76.25 – 10.148.76.30	10.148.76.31
5	10.148.76.32/29	10.148.76.33 – 10.148.76.38	10.148.76.39
6	10.148.76.40/29	10.148.76.41 – 10.148.76.46	10.148.76.47
7	10.148.76.48/29	10.148.76.49 – 10.148.76.54	10.148.76.55
8	10.148.76.56/29	10.148.76.57 – 10.148.76.62	10.148.76.63
9	10.148.76.64/29	10.148.76.65 – 10.148.76.70	10.148.76.71
10	10.148.76.72/29	10.148.76.73 – 10.148.76.78	10.148.76.79
11	10.148.76.80/29	10.148.76.81 – 10.148.76.86	10.148.76.87
12	10.148.76.88/29	10.148.76.89 – 10.148.76.94	10.148.76.95
13	10.148.76.96/29	10.148.76.97 – 10.148.76.102	10.148.76.103
14	10.148.76.104/29	10.148.76.105 – 10.148.76.110	10.148.76.111
15	10.148.76.112/29	10.148.76.113 – 10.148.76.118	10.148.76.119
16	10.148.76.120/29	10.148.76.121 – 10.148.76.126	10.148.76.127
17	10.148.76.128/29	10.148.76.129 – 10.148.76.134	10.148.76.135
18	10.148.76.136/29	10.148.76.137 – 10.148.76.142	10.148.76.143
19	10.148.76.144/29	10.148.76.145 – 10.148.76.150	10.148.76.151
20	10.148.76.152/29	10.148.76.153 – 10.148.76.158	10.148.76.159
21	10.148.76.160/29	10.148.76.161 – 10.148.76.166	10.148.76.167
22	10.148.76.168/29	10.148.76.169 – 10.148.76.174	10.148.76.175
23	10.148.76.176/29	10.148.76.177 – 10.148.76.182	10.148.76.183
24	10.148.76.184/29	10.148.76.185 – 10.148.76.190	10.148.76.191
25	10.148.76.192/29	10.148.76.193 – 10.148.76.198	10.148.76.199
26	10.148.76.200/29	10.148.76.201 – 10.148.76.206	10.148.76.207
27	10.148.76.208/29	10.148.76.209 – 10.148.76.214	10.148.76.215
28	10.148.76.216/29	10.148.76.217 – 10.148.76.222	10.148.76.223
29	10.148.76.224/29	10.148.76.225 – 10.148.76.230	10.148.76.231
30	10.148.76.232/29	10.148.76.233 – 10.148.76.238	10.148.76.239
31	10.148.76.240/29	10.148.76.241 – 10.148.76.246	10.148.76.247
32	10.148.76.248/29	10.148.76.249 – 10.148.76.254	10.148.76.255
33	10.148.77.0/29	10.148.77.1 – 10.148.77.6	10.148.77.7
34	10.148.77.8/29	10.148.77.9 – 10.148.77.14	10.148.77.15
35	10.148.77.16/29	10.148.77.17 – 10.148.77.22	10.148.77.23
36	10.148.77.24/29	10.148.77.25 – 10.148.77.30	10.148.77.31
37	10.148.77.32/29	10.148.77.33 – 10.148.77.38	10.148.77.39
38	10.148.77.40/29	10.148.77.41 – 10.148.77.46	10.148.77.47
39	10.148.77.48/29	10.148.77.49 – 10.148.77.54	10.148.77.55
40	10.148.77.56/29	10.148.77.57 – 10.148.77.62	10.148.77.63
41	10.148.77.64/29	10.148.77.65 – 10.148.77.70	10.148.77.71
42	10.148.77.72/29	10.148.77.73 – 10.148.77.78	10.148.77.79
43	10.148.77.80/29	10.148.77.81 – 10.148.77.86	10.148.77.87
44	10.148.77.88/29	10.148.77.89 – 10.148.77.94	10.148.77.95
45	10.148.77.96/29	10.148.77.97 – 10.148.77.102	10.148.77.103
46	10.148.77.104/29	10.148.77.105 – 10.148.77.110	10.148.77.111
47	10.148.77.112/29	10.148.77.113 – 10.148.77.118	10.148.77.119
48	10.148.77.120/29	10.148.77.121 – 10.148.77.126	10.148.77.127
49	10.148.77.128/29	10.148.77.129 – 10.148.77.134	10.148.77.135
50	10.148.77.136/29	10.148.77.137 – 10.148.77.142	10.148.77.143
51	10.148.77.144/29	10.148.77.145 – 10.148.77.150	10.148.77.151
52	10.148.77.152/29	10.148.77.153 – 10.148.77.158	10.148.77.159
53	10.148.77.160/29	10.148.77.161 – 10.148.77.166	10.148.77.167
54	10.148.77.168/29	10.148.77.169 – 10.148.77.174	10.148.77.175
55	10.148.77.176/29	10.148.77.177 – 10.148.77.182	10.148.77.183
56	10.148.77.184/29	10.148.77.185 – 10.148.77.190	10.148.77.191
57	10.148.77.192/29	10.148.77.193 – 10.148.77.198	10.148.77.199
58	10.148.77.200/29	10.148.77.201 – 10.148.77.206	10.148.77.207
59	10.148.77.208/29	10.148.77.209 – 10.148.77.214	10.148.77.215
60	10.148.77.216/29	10.148.77.217 – 10.148.77.222	10.148.77.223
61	10.148.77.224/29	10.148.77.225 – 10.148.77.230	10.148.77.231
62	10.148.77.232/29	10.148.77.233 – 10.148.77.238	10.148.77.239
63	10.148.77.240/29	10.148.77.241 – 10.148.77.246	10.148.77.247
64	10.148.77.248/29	10.148.77.249 – 10.148.77.254	10.148.77.255

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 →