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)10.64.76.0/25

network10.64.76.0/25

broadcast10.64.76.127

first host10.64.76.1

last host10.64.76.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.64.76.0/25

address00001010.01000000.01001100.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.01000000.01001100.00000000

broadcast00001010.01000000.01001100.01111111

green = network part, grey = host part

hex0x0a404c00

decimal171985920

reverse dns0.76.64.10.in-addr.arpa

ipv4-mapped::ffff:a40:4c00

/25 split into /31 · 64 subnets

close ×

#	network	host range	broadcast
1	10.64.76.0/31	10.64.76.0 – 10.64.76.1	10.64.76.1
2	10.64.76.2/31	10.64.76.2 – 10.64.76.3	10.64.76.3
3	10.64.76.4/31	10.64.76.4 – 10.64.76.5	10.64.76.5
4	10.64.76.6/31	10.64.76.6 – 10.64.76.7	10.64.76.7
5	10.64.76.8/31	10.64.76.8 – 10.64.76.9	10.64.76.9
6	10.64.76.10/31	10.64.76.10 – 10.64.76.11	10.64.76.11
7	10.64.76.12/31	10.64.76.12 – 10.64.76.13	10.64.76.13
8	10.64.76.14/31	10.64.76.14 – 10.64.76.15	10.64.76.15
9	10.64.76.16/31	10.64.76.16 – 10.64.76.17	10.64.76.17
10	10.64.76.18/31	10.64.76.18 – 10.64.76.19	10.64.76.19
11	10.64.76.20/31	10.64.76.20 – 10.64.76.21	10.64.76.21
12	10.64.76.22/31	10.64.76.22 – 10.64.76.23	10.64.76.23
13	10.64.76.24/31	10.64.76.24 – 10.64.76.25	10.64.76.25
14	10.64.76.26/31	10.64.76.26 – 10.64.76.27	10.64.76.27
15	10.64.76.28/31	10.64.76.28 – 10.64.76.29	10.64.76.29
16	10.64.76.30/31	10.64.76.30 – 10.64.76.31	10.64.76.31
17	10.64.76.32/31	10.64.76.32 – 10.64.76.33	10.64.76.33
18	10.64.76.34/31	10.64.76.34 – 10.64.76.35	10.64.76.35
19	10.64.76.36/31	10.64.76.36 – 10.64.76.37	10.64.76.37
20	10.64.76.38/31	10.64.76.38 – 10.64.76.39	10.64.76.39
21	10.64.76.40/31	10.64.76.40 – 10.64.76.41	10.64.76.41
22	10.64.76.42/31	10.64.76.42 – 10.64.76.43	10.64.76.43
23	10.64.76.44/31	10.64.76.44 – 10.64.76.45	10.64.76.45
24	10.64.76.46/31	10.64.76.46 – 10.64.76.47	10.64.76.47
25	10.64.76.48/31	10.64.76.48 – 10.64.76.49	10.64.76.49
26	10.64.76.50/31	10.64.76.50 – 10.64.76.51	10.64.76.51
27	10.64.76.52/31	10.64.76.52 – 10.64.76.53	10.64.76.53
28	10.64.76.54/31	10.64.76.54 – 10.64.76.55	10.64.76.55
29	10.64.76.56/31	10.64.76.56 – 10.64.76.57	10.64.76.57
30	10.64.76.58/31	10.64.76.58 – 10.64.76.59	10.64.76.59
31	10.64.76.60/31	10.64.76.60 – 10.64.76.61	10.64.76.61
32	10.64.76.62/31	10.64.76.62 – 10.64.76.63	10.64.76.63
33	10.64.76.64/31	10.64.76.64 – 10.64.76.65	10.64.76.65
34	10.64.76.66/31	10.64.76.66 – 10.64.76.67	10.64.76.67
35	10.64.76.68/31	10.64.76.68 – 10.64.76.69	10.64.76.69
36	10.64.76.70/31	10.64.76.70 – 10.64.76.71	10.64.76.71
37	10.64.76.72/31	10.64.76.72 – 10.64.76.73	10.64.76.73
38	10.64.76.74/31	10.64.76.74 – 10.64.76.75	10.64.76.75
39	10.64.76.76/31	10.64.76.76 – 10.64.76.77	10.64.76.77
40	10.64.76.78/31	10.64.76.78 – 10.64.76.79	10.64.76.79
41	10.64.76.80/31	10.64.76.80 – 10.64.76.81	10.64.76.81
42	10.64.76.82/31	10.64.76.82 – 10.64.76.83	10.64.76.83
43	10.64.76.84/31	10.64.76.84 – 10.64.76.85	10.64.76.85
44	10.64.76.86/31	10.64.76.86 – 10.64.76.87	10.64.76.87
45	10.64.76.88/31	10.64.76.88 – 10.64.76.89	10.64.76.89
46	10.64.76.90/31	10.64.76.90 – 10.64.76.91	10.64.76.91
47	10.64.76.92/31	10.64.76.92 – 10.64.76.93	10.64.76.93
48	10.64.76.94/31	10.64.76.94 – 10.64.76.95	10.64.76.95
49	10.64.76.96/31	10.64.76.96 – 10.64.76.97	10.64.76.97
50	10.64.76.98/31	10.64.76.98 – 10.64.76.99	10.64.76.99
51	10.64.76.100/31	10.64.76.100 – 10.64.76.101	10.64.76.101
52	10.64.76.102/31	10.64.76.102 – 10.64.76.103	10.64.76.103
53	10.64.76.104/31	10.64.76.104 – 10.64.76.105	10.64.76.105
54	10.64.76.106/31	10.64.76.106 – 10.64.76.107	10.64.76.107
55	10.64.76.108/31	10.64.76.108 – 10.64.76.109	10.64.76.109
56	10.64.76.110/31	10.64.76.110 – 10.64.76.111	10.64.76.111
57	10.64.76.112/31	10.64.76.112 – 10.64.76.113	10.64.76.113
58	10.64.76.114/31	10.64.76.114 – 10.64.76.115	10.64.76.115
59	10.64.76.116/31	10.64.76.116 – 10.64.76.117	10.64.76.117
60	10.64.76.118/31	10.64.76.118 – 10.64.76.119	10.64.76.119
61	10.64.76.120/31	10.64.76.120 – 10.64.76.121	10.64.76.121
62	10.64.76.122/31	10.64.76.122 – 10.64.76.123	10.64.76.123
63	10.64.76.124/31	10.64.76.124 – 10.64.76.125	10.64.76.125
64	10.64.76.126/31	10.64.76.126 – 10.64.76.127	10.64.76.127

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 →