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)10.76.166.0/25

network10.76.166.0/25

broadcast10.76.166.127

first host10.76.166.1

last host10.76.166.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.76.166.0/25

address00001010.01001100.10100110.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.01001100.10100110.00000000

broadcast00001010.01001100.10100110.01111111

green = network part, grey = host part

hex0x0a4ca600

decimal172795392

reverse dns0.166.76.10.in-addr.arpa

ipv4-mapped::ffff:a4c:a600

/25 split into /31 · 64 subnets

close ×

#	network	host range	broadcast
1	10.76.166.0/31	10.76.166.0 – 10.76.166.1	10.76.166.1
2	10.76.166.2/31	10.76.166.2 – 10.76.166.3	10.76.166.3
3	10.76.166.4/31	10.76.166.4 – 10.76.166.5	10.76.166.5
4	10.76.166.6/31	10.76.166.6 – 10.76.166.7	10.76.166.7
5	10.76.166.8/31	10.76.166.8 – 10.76.166.9	10.76.166.9
6	10.76.166.10/31	10.76.166.10 – 10.76.166.11	10.76.166.11
7	10.76.166.12/31	10.76.166.12 – 10.76.166.13	10.76.166.13
8	10.76.166.14/31	10.76.166.14 – 10.76.166.15	10.76.166.15
9	10.76.166.16/31	10.76.166.16 – 10.76.166.17	10.76.166.17
10	10.76.166.18/31	10.76.166.18 – 10.76.166.19	10.76.166.19
11	10.76.166.20/31	10.76.166.20 – 10.76.166.21	10.76.166.21
12	10.76.166.22/31	10.76.166.22 – 10.76.166.23	10.76.166.23
13	10.76.166.24/31	10.76.166.24 – 10.76.166.25	10.76.166.25
14	10.76.166.26/31	10.76.166.26 – 10.76.166.27	10.76.166.27
15	10.76.166.28/31	10.76.166.28 – 10.76.166.29	10.76.166.29
16	10.76.166.30/31	10.76.166.30 – 10.76.166.31	10.76.166.31
17	10.76.166.32/31	10.76.166.32 – 10.76.166.33	10.76.166.33
18	10.76.166.34/31	10.76.166.34 – 10.76.166.35	10.76.166.35
19	10.76.166.36/31	10.76.166.36 – 10.76.166.37	10.76.166.37
20	10.76.166.38/31	10.76.166.38 – 10.76.166.39	10.76.166.39
21	10.76.166.40/31	10.76.166.40 – 10.76.166.41	10.76.166.41
22	10.76.166.42/31	10.76.166.42 – 10.76.166.43	10.76.166.43
23	10.76.166.44/31	10.76.166.44 – 10.76.166.45	10.76.166.45
24	10.76.166.46/31	10.76.166.46 – 10.76.166.47	10.76.166.47
25	10.76.166.48/31	10.76.166.48 – 10.76.166.49	10.76.166.49
26	10.76.166.50/31	10.76.166.50 – 10.76.166.51	10.76.166.51
27	10.76.166.52/31	10.76.166.52 – 10.76.166.53	10.76.166.53
28	10.76.166.54/31	10.76.166.54 – 10.76.166.55	10.76.166.55
29	10.76.166.56/31	10.76.166.56 – 10.76.166.57	10.76.166.57
30	10.76.166.58/31	10.76.166.58 – 10.76.166.59	10.76.166.59
31	10.76.166.60/31	10.76.166.60 – 10.76.166.61	10.76.166.61
32	10.76.166.62/31	10.76.166.62 – 10.76.166.63	10.76.166.63
33	10.76.166.64/31	10.76.166.64 – 10.76.166.65	10.76.166.65
34	10.76.166.66/31	10.76.166.66 – 10.76.166.67	10.76.166.67
35	10.76.166.68/31	10.76.166.68 – 10.76.166.69	10.76.166.69
36	10.76.166.70/31	10.76.166.70 – 10.76.166.71	10.76.166.71
37	10.76.166.72/31	10.76.166.72 – 10.76.166.73	10.76.166.73
38	10.76.166.74/31	10.76.166.74 – 10.76.166.75	10.76.166.75
39	10.76.166.76/31	10.76.166.76 – 10.76.166.77	10.76.166.77
40	10.76.166.78/31	10.76.166.78 – 10.76.166.79	10.76.166.79
41	10.76.166.80/31	10.76.166.80 – 10.76.166.81	10.76.166.81
42	10.76.166.82/31	10.76.166.82 – 10.76.166.83	10.76.166.83
43	10.76.166.84/31	10.76.166.84 – 10.76.166.85	10.76.166.85
44	10.76.166.86/31	10.76.166.86 – 10.76.166.87	10.76.166.87
45	10.76.166.88/31	10.76.166.88 – 10.76.166.89	10.76.166.89
46	10.76.166.90/31	10.76.166.90 – 10.76.166.91	10.76.166.91
47	10.76.166.92/31	10.76.166.92 – 10.76.166.93	10.76.166.93
48	10.76.166.94/31	10.76.166.94 – 10.76.166.95	10.76.166.95
49	10.76.166.96/31	10.76.166.96 – 10.76.166.97	10.76.166.97
50	10.76.166.98/31	10.76.166.98 – 10.76.166.99	10.76.166.99
51	10.76.166.100/31	10.76.166.100 – 10.76.166.101	10.76.166.101
52	10.76.166.102/31	10.76.166.102 – 10.76.166.103	10.76.166.103
53	10.76.166.104/31	10.76.166.104 – 10.76.166.105	10.76.166.105
54	10.76.166.106/31	10.76.166.106 – 10.76.166.107	10.76.166.107
55	10.76.166.108/31	10.76.166.108 – 10.76.166.109	10.76.166.109
56	10.76.166.110/31	10.76.166.110 – 10.76.166.111	10.76.166.111
57	10.76.166.112/31	10.76.166.112 – 10.76.166.113	10.76.166.113
58	10.76.166.114/31	10.76.166.114 – 10.76.166.115	10.76.166.115
59	10.76.166.116/31	10.76.166.116 – 10.76.166.117	10.76.166.117
60	10.76.166.118/31	10.76.166.118 – 10.76.166.119	10.76.166.119
61	10.76.166.120/31	10.76.166.120 – 10.76.166.121	10.76.166.121
62	10.76.166.122/31	10.76.166.122 – 10.76.166.123	10.76.166.123
63	10.76.166.124/31	10.76.166.124 – 10.76.166.125	10.76.166.125
64	10.76.166.126/31	10.76.166.126 – 10.76.166.127	10.76.166.127

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