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)10.2.88.0/25

network10.2.88.0/25

broadcast10.2.88.127

first host10.2.88.1

last host10.2.88.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.88.0/25

address00001010.00000010.01011000.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.01011000.00000000

broadcast00001010.00000010.01011000.01111111

green = network part, grey = host part

hex0x0a025800

decimal167925760

reverse dns0.88.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:5800

/25 split into /31 · 64 subnets

close ×

#	network	host range	broadcast
1	10.2.88.0/31	10.2.88.0 – 10.2.88.1	10.2.88.1
2	10.2.88.2/31	10.2.88.2 – 10.2.88.3	10.2.88.3
3	10.2.88.4/31	10.2.88.4 – 10.2.88.5	10.2.88.5
4	10.2.88.6/31	10.2.88.6 – 10.2.88.7	10.2.88.7
5	10.2.88.8/31	10.2.88.8 – 10.2.88.9	10.2.88.9
6	10.2.88.10/31	10.2.88.10 – 10.2.88.11	10.2.88.11
7	10.2.88.12/31	10.2.88.12 – 10.2.88.13	10.2.88.13
8	10.2.88.14/31	10.2.88.14 – 10.2.88.15	10.2.88.15
9	10.2.88.16/31	10.2.88.16 – 10.2.88.17	10.2.88.17
10	10.2.88.18/31	10.2.88.18 – 10.2.88.19	10.2.88.19
11	10.2.88.20/31	10.2.88.20 – 10.2.88.21	10.2.88.21
12	10.2.88.22/31	10.2.88.22 – 10.2.88.23	10.2.88.23
13	10.2.88.24/31	10.2.88.24 – 10.2.88.25	10.2.88.25
14	10.2.88.26/31	10.2.88.26 – 10.2.88.27	10.2.88.27
15	10.2.88.28/31	10.2.88.28 – 10.2.88.29	10.2.88.29
16	10.2.88.30/31	10.2.88.30 – 10.2.88.31	10.2.88.31
17	10.2.88.32/31	10.2.88.32 – 10.2.88.33	10.2.88.33
18	10.2.88.34/31	10.2.88.34 – 10.2.88.35	10.2.88.35
19	10.2.88.36/31	10.2.88.36 – 10.2.88.37	10.2.88.37
20	10.2.88.38/31	10.2.88.38 – 10.2.88.39	10.2.88.39
21	10.2.88.40/31	10.2.88.40 – 10.2.88.41	10.2.88.41
22	10.2.88.42/31	10.2.88.42 – 10.2.88.43	10.2.88.43
23	10.2.88.44/31	10.2.88.44 – 10.2.88.45	10.2.88.45
24	10.2.88.46/31	10.2.88.46 – 10.2.88.47	10.2.88.47
25	10.2.88.48/31	10.2.88.48 – 10.2.88.49	10.2.88.49
26	10.2.88.50/31	10.2.88.50 – 10.2.88.51	10.2.88.51
27	10.2.88.52/31	10.2.88.52 – 10.2.88.53	10.2.88.53
28	10.2.88.54/31	10.2.88.54 – 10.2.88.55	10.2.88.55
29	10.2.88.56/31	10.2.88.56 – 10.2.88.57	10.2.88.57
30	10.2.88.58/31	10.2.88.58 – 10.2.88.59	10.2.88.59
31	10.2.88.60/31	10.2.88.60 – 10.2.88.61	10.2.88.61
32	10.2.88.62/31	10.2.88.62 – 10.2.88.63	10.2.88.63
33	10.2.88.64/31	10.2.88.64 – 10.2.88.65	10.2.88.65
34	10.2.88.66/31	10.2.88.66 – 10.2.88.67	10.2.88.67
35	10.2.88.68/31	10.2.88.68 – 10.2.88.69	10.2.88.69
36	10.2.88.70/31	10.2.88.70 – 10.2.88.71	10.2.88.71
37	10.2.88.72/31	10.2.88.72 – 10.2.88.73	10.2.88.73
38	10.2.88.74/31	10.2.88.74 – 10.2.88.75	10.2.88.75
39	10.2.88.76/31	10.2.88.76 – 10.2.88.77	10.2.88.77
40	10.2.88.78/31	10.2.88.78 – 10.2.88.79	10.2.88.79
41	10.2.88.80/31	10.2.88.80 – 10.2.88.81	10.2.88.81
42	10.2.88.82/31	10.2.88.82 – 10.2.88.83	10.2.88.83
43	10.2.88.84/31	10.2.88.84 – 10.2.88.85	10.2.88.85
44	10.2.88.86/31	10.2.88.86 – 10.2.88.87	10.2.88.87
45	10.2.88.88/31	10.2.88.88 – 10.2.88.89	10.2.88.89
46	10.2.88.90/31	10.2.88.90 – 10.2.88.91	10.2.88.91
47	10.2.88.92/31	10.2.88.92 – 10.2.88.93	10.2.88.93
48	10.2.88.94/31	10.2.88.94 – 10.2.88.95	10.2.88.95
49	10.2.88.96/31	10.2.88.96 – 10.2.88.97	10.2.88.97
50	10.2.88.98/31	10.2.88.98 – 10.2.88.99	10.2.88.99
51	10.2.88.100/31	10.2.88.100 – 10.2.88.101	10.2.88.101
52	10.2.88.102/31	10.2.88.102 – 10.2.88.103	10.2.88.103
53	10.2.88.104/31	10.2.88.104 – 10.2.88.105	10.2.88.105
54	10.2.88.106/31	10.2.88.106 – 10.2.88.107	10.2.88.107
55	10.2.88.108/31	10.2.88.108 – 10.2.88.109	10.2.88.109
56	10.2.88.110/31	10.2.88.110 – 10.2.88.111	10.2.88.111
57	10.2.88.112/31	10.2.88.112 – 10.2.88.113	10.2.88.113
58	10.2.88.114/31	10.2.88.114 – 10.2.88.115	10.2.88.115
59	10.2.88.116/31	10.2.88.116 – 10.2.88.117	10.2.88.117
60	10.2.88.118/31	10.2.88.118 – 10.2.88.119	10.2.88.119
61	10.2.88.120/31	10.2.88.120 – 10.2.88.121	10.2.88.121
62	10.2.88.122/31	10.2.88.122 – 10.2.88.123	10.2.88.123
63	10.2.88.124/31	10.2.88.124 – 10.2.88.125	10.2.88.125
64	10.2.88.126/31	10.2.88.126 – 10.2.88.127	10.2.88.127

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 →