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)10.2.8.0/25

network10.2.8.0/25

broadcast10.2.8.127

first host10.2.8.1

last host10.2.8.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.8.0/25

address00001010.00000010.00001000.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.00001000.00000000

broadcast00001010.00000010.00001000.01111111

green = network part, grey = host part

hex0x0a020800

decimal167905280

reverse dns0.8.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:800

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.8.0/32	10.2.8.0 – 10.2.8.0	10.2.8.0
2	10.2.8.1/32	10.2.8.1 – 10.2.8.1	10.2.8.1
3	10.2.8.2/32	10.2.8.2 – 10.2.8.2	10.2.8.2
4	10.2.8.3/32	10.2.8.3 – 10.2.8.3	10.2.8.3
5	10.2.8.4/32	10.2.8.4 – 10.2.8.4	10.2.8.4
6	10.2.8.5/32	10.2.8.5 – 10.2.8.5	10.2.8.5
7	10.2.8.6/32	10.2.8.6 – 10.2.8.6	10.2.8.6
8	10.2.8.7/32	10.2.8.7 – 10.2.8.7	10.2.8.7
9	10.2.8.8/32	10.2.8.8 – 10.2.8.8	10.2.8.8
10	10.2.8.9/32	10.2.8.9 – 10.2.8.9	10.2.8.9
11	10.2.8.10/32	10.2.8.10 – 10.2.8.10	10.2.8.10
12	10.2.8.11/32	10.2.8.11 – 10.2.8.11	10.2.8.11
13	10.2.8.12/32	10.2.8.12 – 10.2.8.12	10.2.8.12
14	10.2.8.13/32	10.2.8.13 – 10.2.8.13	10.2.8.13
15	10.2.8.14/32	10.2.8.14 – 10.2.8.14	10.2.8.14
16	10.2.8.15/32	10.2.8.15 – 10.2.8.15	10.2.8.15
17	10.2.8.16/32	10.2.8.16 – 10.2.8.16	10.2.8.16
18	10.2.8.17/32	10.2.8.17 – 10.2.8.17	10.2.8.17
19	10.2.8.18/32	10.2.8.18 – 10.2.8.18	10.2.8.18
20	10.2.8.19/32	10.2.8.19 – 10.2.8.19	10.2.8.19
21	10.2.8.20/32	10.2.8.20 – 10.2.8.20	10.2.8.20
22	10.2.8.21/32	10.2.8.21 – 10.2.8.21	10.2.8.21
23	10.2.8.22/32	10.2.8.22 – 10.2.8.22	10.2.8.22
24	10.2.8.23/32	10.2.8.23 – 10.2.8.23	10.2.8.23
25	10.2.8.24/32	10.2.8.24 – 10.2.8.24	10.2.8.24
26	10.2.8.25/32	10.2.8.25 – 10.2.8.25	10.2.8.25
27	10.2.8.26/32	10.2.8.26 – 10.2.8.26	10.2.8.26
28	10.2.8.27/32	10.2.8.27 – 10.2.8.27	10.2.8.27
29	10.2.8.28/32	10.2.8.28 – 10.2.8.28	10.2.8.28
30	10.2.8.29/32	10.2.8.29 – 10.2.8.29	10.2.8.29
31	10.2.8.30/32	10.2.8.30 – 10.2.8.30	10.2.8.30
32	10.2.8.31/32	10.2.8.31 – 10.2.8.31	10.2.8.31
33	10.2.8.32/32	10.2.8.32 – 10.2.8.32	10.2.8.32
34	10.2.8.33/32	10.2.8.33 – 10.2.8.33	10.2.8.33
35	10.2.8.34/32	10.2.8.34 – 10.2.8.34	10.2.8.34
36	10.2.8.35/32	10.2.8.35 – 10.2.8.35	10.2.8.35
37	10.2.8.36/32	10.2.8.36 – 10.2.8.36	10.2.8.36
38	10.2.8.37/32	10.2.8.37 – 10.2.8.37	10.2.8.37
39	10.2.8.38/32	10.2.8.38 – 10.2.8.38	10.2.8.38
40	10.2.8.39/32	10.2.8.39 – 10.2.8.39	10.2.8.39
41	10.2.8.40/32	10.2.8.40 – 10.2.8.40	10.2.8.40
42	10.2.8.41/32	10.2.8.41 – 10.2.8.41	10.2.8.41
43	10.2.8.42/32	10.2.8.42 – 10.2.8.42	10.2.8.42
44	10.2.8.43/32	10.2.8.43 – 10.2.8.43	10.2.8.43
45	10.2.8.44/32	10.2.8.44 – 10.2.8.44	10.2.8.44
46	10.2.8.45/32	10.2.8.45 – 10.2.8.45	10.2.8.45
47	10.2.8.46/32	10.2.8.46 – 10.2.8.46	10.2.8.46
48	10.2.8.47/32	10.2.8.47 – 10.2.8.47	10.2.8.47
49	10.2.8.48/32	10.2.8.48 – 10.2.8.48	10.2.8.48
50	10.2.8.49/32	10.2.8.49 – 10.2.8.49	10.2.8.49
51	10.2.8.50/32	10.2.8.50 – 10.2.8.50	10.2.8.50
52	10.2.8.51/32	10.2.8.51 – 10.2.8.51	10.2.8.51
53	10.2.8.52/32	10.2.8.52 – 10.2.8.52	10.2.8.52
54	10.2.8.53/32	10.2.8.53 – 10.2.8.53	10.2.8.53
55	10.2.8.54/32	10.2.8.54 – 10.2.8.54	10.2.8.54
56	10.2.8.55/32	10.2.8.55 – 10.2.8.55	10.2.8.55
57	10.2.8.56/32	10.2.8.56 – 10.2.8.56	10.2.8.56
58	10.2.8.57/32	10.2.8.57 – 10.2.8.57	10.2.8.57
59	10.2.8.58/32	10.2.8.58 – 10.2.8.58	10.2.8.58
60	10.2.8.59/32	10.2.8.59 – 10.2.8.59	10.2.8.59
61	10.2.8.60/32	10.2.8.60 – 10.2.8.60	10.2.8.60
62	10.2.8.61/32	10.2.8.61 – 10.2.8.61	10.2.8.61
63	10.2.8.62/32	10.2.8.62 – 10.2.8.62	10.2.8.62
64	10.2.8.63/32	10.2.8.63 – 10.2.8.63	10.2.8.63
65	10.2.8.64/32	10.2.8.64 – 10.2.8.64	10.2.8.64
66	10.2.8.65/32	10.2.8.65 – 10.2.8.65	10.2.8.65
67	10.2.8.66/32	10.2.8.66 – 10.2.8.66	10.2.8.66
68	10.2.8.67/32	10.2.8.67 – 10.2.8.67	10.2.8.67
69	10.2.8.68/32	10.2.8.68 – 10.2.8.68	10.2.8.68
70	10.2.8.69/32	10.2.8.69 – 10.2.8.69	10.2.8.69
71	10.2.8.70/32	10.2.8.70 – 10.2.8.70	10.2.8.70
72	10.2.8.71/32	10.2.8.71 – 10.2.8.71	10.2.8.71
73	10.2.8.72/32	10.2.8.72 – 10.2.8.72	10.2.8.72
74	10.2.8.73/32	10.2.8.73 – 10.2.8.73	10.2.8.73
75	10.2.8.74/32	10.2.8.74 – 10.2.8.74	10.2.8.74
76	10.2.8.75/32	10.2.8.75 – 10.2.8.75	10.2.8.75
77	10.2.8.76/32	10.2.8.76 – 10.2.8.76	10.2.8.76
78	10.2.8.77/32	10.2.8.77 – 10.2.8.77	10.2.8.77
79	10.2.8.78/32	10.2.8.78 – 10.2.8.78	10.2.8.78
80	10.2.8.79/32	10.2.8.79 – 10.2.8.79	10.2.8.79
81	10.2.8.80/32	10.2.8.80 – 10.2.8.80	10.2.8.80
82	10.2.8.81/32	10.2.8.81 – 10.2.8.81	10.2.8.81
83	10.2.8.82/32	10.2.8.82 – 10.2.8.82	10.2.8.82
84	10.2.8.83/32	10.2.8.83 – 10.2.8.83	10.2.8.83
85	10.2.8.84/32	10.2.8.84 – 10.2.8.84	10.2.8.84
86	10.2.8.85/32	10.2.8.85 – 10.2.8.85	10.2.8.85
87	10.2.8.86/32	10.2.8.86 – 10.2.8.86	10.2.8.86
88	10.2.8.87/32	10.2.8.87 – 10.2.8.87	10.2.8.87
89	10.2.8.88/32	10.2.8.88 – 10.2.8.88	10.2.8.88
90	10.2.8.89/32	10.2.8.89 – 10.2.8.89	10.2.8.89
91	10.2.8.90/32	10.2.8.90 – 10.2.8.90	10.2.8.90
92	10.2.8.91/32	10.2.8.91 – 10.2.8.91	10.2.8.91
93	10.2.8.92/32	10.2.8.92 – 10.2.8.92	10.2.8.92
94	10.2.8.93/32	10.2.8.93 – 10.2.8.93	10.2.8.93
95	10.2.8.94/32	10.2.8.94 – 10.2.8.94	10.2.8.94
96	10.2.8.95/32	10.2.8.95 – 10.2.8.95	10.2.8.95
97	10.2.8.96/32	10.2.8.96 – 10.2.8.96	10.2.8.96
98	10.2.8.97/32	10.2.8.97 – 10.2.8.97	10.2.8.97
99	10.2.8.98/32	10.2.8.98 – 10.2.8.98	10.2.8.98
100	10.2.8.99/32	10.2.8.99 – 10.2.8.99	10.2.8.99
101	10.2.8.100/32	10.2.8.100 – 10.2.8.100	10.2.8.100
102	10.2.8.101/32	10.2.8.101 – 10.2.8.101	10.2.8.101
103	10.2.8.102/32	10.2.8.102 – 10.2.8.102	10.2.8.102
104	10.2.8.103/32	10.2.8.103 – 10.2.8.103	10.2.8.103
105	10.2.8.104/32	10.2.8.104 – 10.2.8.104	10.2.8.104
106	10.2.8.105/32	10.2.8.105 – 10.2.8.105	10.2.8.105
107	10.2.8.106/32	10.2.8.106 – 10.2.8.106	10.2.8.106
108	10.2.8.107/32	10.2.8.107 – 10.2.8.107	10.2.8.107
109	10.2.8.108/32	10.2.8.108 – 10.2.8.108	10.2.8.108
110	10.2.8.109/32	10.2.8.109 – 10.2.8.109	10.2.8.109
111	10.2.8.110/32	10.2.8.110 – 10.2.8.110	10.2.8.110
112	10.2.8.111/32	10.2.8.111 – 10.2.8.111	10.2.8.111
113	10.2.8.112/32	10.2.8.112 – 10.2.8.112	10.2.8.112
114	10.2.8.113/32	10.2.8.113 – 10.2.8.113	10.2.8.113
115	10.2.8.114/32	10.2.8.114 – 10.2.8.114	10.2.8.114
116	10.2.8.115/32	10.2.8.115 – 10.2.8.115	10.2.8.115
117	10.2.8.116/32	10.2.8.116 – 10.2.8.116	10.2.8.116
118	10.2.8.117/32	10.2.8.117 – 10.2.8.117	10.2.8.117
119	10.2.8.118/32	10.2.8.118 – 10.2.8.118	10.2.8.118
120	10.2.8.119/32	10.2.8.119 – 10.2.8.119	10.2.8.119
121	10.2.8.120/32	10.2.8.120 – 10.2.8.120	10.2.8.120
122	10.2.8.121/32	10.2.8.121 – 10.2.8.121	10.2.8.121
123	10.2.8.122/32	10.2.8.122 – 10.2.8.122	10.2.8.122
124	10.2.8.123/32	10.2.8.123 – 10.2.8.123	10.2.8.123
125	10.2.8.124/32	10.2.8.124 – 10.2.8.124	10.2.8.124
126	10.2.8.125/32	10.2.8.125 – 10.2.8.125	10.2.8.125
127	10.2.8.126/32	10.2.8.126 – 10.2.8.126	10.2.8.126
128	10.2.8.127/32	10.2.8.127 – 10.2.8.127	10.2.8.127

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 →