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)10.76.77.0/25

network10.76.77.0/25

broadcast10.76.77.127

first host10.76.77.1

last host10.76.77.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.76.77.0/25

address00001010.01001100.01001101.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.01001100.01001101.00000000

broadcast00001010.01001100.01001101.01111111

green = network part, grey = host part

hex0x0a4c4d00

decimal172772608

reverse dns0.77.76.10.in-addr.arpa

ipv4-mapped::ffff:a4c:4d00

/25 split into /31 · 64 subnets

close ×

#	network	host range	broadcast
1	10.76.77.0/31	10.76.77.0 – 10.76.77.1	10.76.77.1
2	10.76.77.2/31	10.76.77.2 – 10.76.77.3	10.76.77.3
3	10.76.77.4/31	10.76.77.4 – 10.76.77.5	10.76.77.5
4	10.76.77.6/31	10.76.77.6 – 10.76.77.7	10.76.77.7
5	10.76.77.8/31	10.76.77.8 – 10.76.77.9	10.76.77.9
6	10.76.77.10/31	10.76.77.10 – 10.76.77.11	10.76.77.11
7	10.76.77.12/31	10.76.77.12 – 10.76.77.13	10.76.77.13
8	10.76.77.14/31	10.76.77.14 – 10.76.77.15	10.76.77.15
9	10.76.77.16/31	10.76.77.16 – 10.76.77.17	10.76.77.17
10	10.76.77.18/31	10.76.77.18 – 10.76.77.19	10.76.77.19
11	10.76.77.20/31	10.76.77.20 – 10.76.77.21	10.76.77.21
12	10.76.77.22/31	10.76.77.22 – 10.76.77.23	10.76.77.23
13	10.76.77.24/31	10.76.77.24 – 10.76.77.25	10.76.77.25
14	10.76.77.26/31	10.76.77.26 – 10.76.77.27	10.76.77.27
15	10.76.77.28/31	10.76.77.28 – 10.76.77.29	10.76.77.29
16	10.76.77.30/31	10.76.77.30 – 10.76.77.31	10.76.77.31
17	10.76.77.32/31	10.76.77.32 – 10.76.77.33	10.76.77.33
18	10.76.77.34/31	10.76.77.34 – 10.76.77.35	10.76.77.35
19	10.76.77.36/31	10.76.77.36 – 10.76.77.37	10.76.77.37
20	10.76.77.38/31	10.76.77.38 – 10.76.77.39	10.76.77.39
21	10.76.77.40/31	10.76.77.40 – 10.76.77.41	10.76.77.41
22	10.76.77.42/31	10.76.77.42 – 10.76.77.43	10.76.77.43
23	10.76.77.44/31	10.76.77.44 – 10.76.77.45	10.76.77.45
24	10.76.77.46/31	10.76.77.46 – 10.76.77.47	10.76.77.47
25	10.76.77.48/31	10.76.77.48 – 10.76.77.49	10.76.77.49
26	10.76.77.50/31	10.76.77.50 – 10.76.77.51	10.76.77.51
27	10.76.77.52/31	10.76.77.52 – 10.76.77.53	10.76.77.53
28	10.76.77.54/31	10.76.77.54 – 10.76.77.55	10.76.77.55
29	10.76.77.56/31	10.76.77.56 – 10.76.77.57	10.76.77.57
30	10.76.77.58/31	10.76.77.58 – 10.76.77.59	10.76.77.59
31	10.76.77.60/31	10.76.77.60 – 10.76.77.61	10.76.77.61
32	10.76.77.62/31	10.76.77.62 – 10.76.77.63	10.76.77.63
33	10.76.77.64/31	10.76.77.64 – 10.76.77.65	10.76.77.65
34	10.76.77.66/31	10.76.77.66 – 10.76.77.67	10.76.77.67
35	10.76.77.68/31	10.76.77.68 – 10.76.77.69	10.76.77.69
36	10.76.77.70/31	10.76.77.70 – 10.76.77.71	10.76.77.71
37	10.76.77.72/31	10.76.77.72 – 10.76.77.73	10.76.77.73
38	10.76.77.74/31	10.76.77.74 – 10.76.77.75	10.76.77.75
39	10.76.77.76/31	10.76.77.76 – 10.76.77.77	10.76.77.77
40	10.76.77.78/31	10.76.77.78 – 10.76.77.79	10.76.77.79
41	10.76.77.80/31	10.76.77.80 – 10.76.77.81	10.76.77.81
42	10.76.77.82/31	10.76.77.82 – 10.76.77.83	10.76.77.83
43	10.76.77.84/31	10.76.77.84 – 10.76.77.85	10.76.77.85
44	10.76.77.86/31	10.76.77.86 – 10.76.77.87	10.76.77.87
45	10.76.77.88/31	10.76.77.88 – 10.76.77.89	10.76.77.89
46	10.76.77.90/31	10.76.77.90 – 10.76.77.91	10.76.77.91
47	10.76.77.92/31	10.76.77.92 – 10.76.77.93	10.76.77.93
48	10.76.77.94/31	10.76.77.94 – 10.76.77.95	10.76.77.95
49	10.76.77.96/31	10.76.77.96 – 10.76.77.97	10.76.77.97
50	10.76.77.98/31	10.76.77.98 – 10.76.77.99	10.76.77.99
51	10.76.77.100/31	10.76.77.100 – 10.76.77.101	10.76.77.101
52	10.76.77.102/31	10.76.77.102 – 10.76.77.103	10.76.77.103
53	10.76.77.104/31	10.76.77.104 – 10.76.77.105	10.76.77.105
54	10.76.77.106/31	10.76.77.106 – 10.76.77.107	10.76.77.107
55	10.76.77.108/31	10.76.77.108 – 10.76.77.109	10.76.77.109
56	10.76.77.110/31	10.76.77.110 – 10.76.77.111	10.76.77.111
57	10.76.77.112/31	10.76.77.112 – 10.76.77.113	10.76.77.113
58	10.76.77.114/31	10.76.77.114 – 10.76.77.115	10.76.77.115
59	10.76.77.116/31	10.76.77.116 – 10.76.77.117	10.76.77.117
60	10.76.77.118/31	10.76.77.118 – 10.76.77.119	10.76.77.119
61	10.76.77.120/31	10.76.77.120 – 10.76.77.121	10.76.77.121
62	10.76.77.122/31	10.76.77.122 – 10.76.77.123	10.76.77.123
63	10.76.77.124/31	10.76.77.124 – 10.76.77.125	10.76.77.125
64	10.76.77.126/31	10.76.77.126 – 10.76.77.127	10.76.77.127

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 →