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)10.2.160.0/25

network10.2.160.0/25

broadcast10.2.160.127

first host10.2.160.1

last host10.2.160.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.160.0/25

address00001010.00000010.10100000.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.10100000.00000000

broadcast00001010.00000010.10100000.01111111

green = network part, grey = host part

hex0x0a02a000

decimal167944192

reverse dns0.160.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:a000

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.160.0/32	10.2.160.0 – 10.2.160.0	10.2.160.0
2	10.2.160.1/32	10.2.160.1 – 10.2.160.1	10.2.160.1
3	10.2.160.2/32	10.2.160.2 – 10.2.160.2	10.2.160.2
4	10.2.160.3/32	10.2.160.3 – 10.2.160.3	10.2.160.3
5	10.2.160.4/32	10.2.160.4 – 10.2.160.4	10.2.160.4
6	10.2.160.5/32	10.2.160.5 – 10.2.160.5	10.2.160.5
7	10.2.160.6/32	10.2.160.6 – 10.2.160.6	10.2.160.6
8	10.2.160.7/32	10.2.160.7 – 10.2.160.7	10.2.160.7
9	10.2.160.8/32	10.2.160.8 – 10.2.160.8	10.2.160.8
10	10.2.160.9/32	10.2.160.9 – 10.2.160.9	10.2.160.9
11	10.2.160.10/32	10.2.160.10 – 10.2.160.10	10.2.160.10
12	10.2.160.11/32	10.2.160.11 – 10.2.160.11	10.2.160.11
13	10.2.160.12/32	10.2.160.12 – 10.2.160.12	10.2.160.12
14	10.2.160.13/32	10.2.160.13 – 10.2.160.13	10.2.160.13
15	10.2.160.14/32	10.2.160.14 – 10.2.160.14	10.2.160.14
16	10.2.160.15/32	10.2.160.15 – 10.2.160.15	10.2.160.15
17	10.2.160.16/32	10.2.160.16 – 10.2.160.16	10.2.160.16
18	10.2.160.17/32	10.2.160.17 – 10.2.160.17	10.2.160.17
19	10.2.160.18/32	10.2.160.18 – 10.2.160.18	10.2.160.18
20	10.2.160.19/32	10.2.160.19 – 10.2.160.19	10.2.160.19
21	10.2.160.20/32	10.2.160.20 – 10.2.160.20	10.2.160.20
22	10.2.160.21/32	10.2.160.21 – 10.2.160.21	10.2.160.21
23	10.2.160.22/32	10.2.160.22 – 10.2.160.22	10.2.160.22
24	10.2.160.23/32	10.2.160.23 – 10.2.160.23	10.2.160.23
25	10.2.160.24/32	10.2.160.24 – 10.2.160.24	10.2.160.24
26	10.2.160.25/32	10.2.160.25 – 10.2.160.25	10.2.160.25
27	10.2.160.26/32	10.2.160.26 – 10.2.160.26	10.2.160.26
28	10.2.160.27/32	10.2.160.27 – 10.2.160.27	10.2.160.27
29	10.2.160.28/32	10.2.160.28 – 10.2.160.28	10.2.160.28
30	10.2.160.29/32	10.2.160.29 – 10.2.160.29	10.2.160.29
31	10.2.160.30/32	10.2.160.30 – 10.2.160.30	10.2.160.30
32	10.2.160.31/32	10.2.160.31 – 10.2.160.31	10.2.160.31
33	10.2.160.32/32	10.2.160.32 – 10.2.160.32	10.2.160.32
34	10.2.160.33/32	10.2.160.33 – 10.2.160.33	10.2.160.33
35	10.2.160.34/32	10.2.160.34 – 10.2.160.34	10.2.160.34
36	10.2.160.35/32	10.2.160.35 – 10.2.160.35	10.2.160.35
37	10.2.160.36/32	10.2.160.36 – 10.2.160.36	10.2.160.36
38	10.2.160.37/32	10.2.160.37 – 10.2.160.37	10.2.160.37
39	10.2.160.38/32	10.2.160.38 – 10.2.160.38	10.2.160.38
40	10.2.160.39/32	10.2.160.39 – 10.2.160.39	10.2.160.39
41	10.2.160.40/32	10.2.160.40 – 10.2.160.40	10.2.160.40
42	10.2.160.41/32	10.2.160.41 – 10.2.160.41	10.2.160.41
43	10.2.160.42/32	10.2.160.42 – 10.2.160.42	10.2.160.42
44	10.2.160.43/32	10.2.160.43 – 10.2.160.43	10.2.160.43
45	10.2.160.44/32	10.2.160.44 – 10.2.160.44	10.2.160.44
46	10.2.160.45/32	10.2.160.45 – 10.2.160.45	10.2.160.45
47	10.2.160.46/32	10.2.160.46 – 10.2.160.46	10.2.160.46
48	10.2.160.47/32	10.2.160.47 – 10.2.160.47	10.2.160.47
49	10.2.160.48/32	10.2.160.48 – 10.2.160.48	10.2.160.48
50	10.2.160.49/32	10.2.160.49 – 10.2.160.49	10.2.160.49
51	10.2.160.50/32	10.2.160.50 – 10.2.160.50	10.2.160.50
52	10.2.160.51/32	10.2.160.51 – 10.2.160.51	10.2.160.51
53	10.2.160.52/32	10.2.160.52 – 10.2.160.52	10.2.160.52
54	10.2.160.53/32	10.2.160.53 – 10.2.160.53	10.2.160.53
55	10.2.160.54/32	10.2.160.54 – 10.2.160.54	10.2.160.54
56	10.2.160.55/32	10.2.160.55 – 10.2.160.55	10.2.160.55
57	10.2.160.56/32	10.2.160.56 – 10.2.160.56	10.2.160.56
58	10.2.160.57/32	10.2.160.57 – 10.2.160.57	10.2.160.57
59	10.2.160.58/32	10.2.160.58 – 10.2.160.58	10.2.160.58
60	10.2.160.59/32	10.2.160.59 – 10.2.160.59	10.2.160.59
61	10.2.160.60/32	10.2.160.60 – 10.2.160.60	10.2.160.60
62	10.2.160.61/32	10.2.160.61 – 10.2.160.61	10.2.160.61
63	10.2.160.62/32	10.2.160.62 – 10.2.160.62	10.2.160.62
64	10.2.160.63/32	10.2.160.63 – 10.2.160.63	10.2.160.63
65	10.2.160.64/32	10.2.160.64 – 10.2.160.64	10.2.160.64
66	10.2.160.65/32	10.2.160.65 – 10.2.160.65	10.2.160.65
67	10.2.160.66/32	10.2.160.66 – 10.2.160.66	10.2.160.66
68	10.2.160.67/32	10.2.160.67 – 10.2.160.67	10.2.160.67
69	10.2.160.68/32	10.2.160.68 – 10.2.160.68	10.2.160.68
70	10.2.160.69/32	10.2.160.69 – 10.2.160.69	10.2.160.69
71	10.2.160.70/32	10.2.160.70 – 10.2.160.70	10.2.160.70
72	10.2.160.71/32	10.2.160.71 – 10.2.160.71	10.2.160.71
73	10.2.160.72/32	10.2.160.72 – 10.2.160.72	10.2.160.72
74	10.2.160.73/32	10.2.160.73 – 10.2.160.73	10.2.160.73
75	10.2.160.74/32	10.2.160.74 – 10.2.160.74	10.2.160.74
76	10.2.160.75/32	10.2.160.75 – 10.2.160.75	10.2.160.75
77	10.2.160.76/32	10.2.160.76 – 10.2.160.76	10.2.160.76
78	10.2.160.77/32	10.2.160.77 – 10.2.160.77	10.2.160.77
79	10.2.160.78/32	10.2.160.78 – 10.2.160.78	10.2.160.78
80	10.2.160.79/32	10.2.160.79 – 10.2.160.79	10.2.160.79
81	10.2.160.80/32	10.2.160.80 – 10.2.160.80	10.2.160.80
82	10.2.160.81/32	10.2.160.81 – 10.2.160.81	10.2.160.81
83	10.2.160.82/32	10.2.160.82 – 10.2.160.82	10.2.160.82
84	10.2.160.83/32	10.2.160.83 – 10.2.160.83	10.2.160.83
85	10.2.160.84/32	10.2.160.84 – 10.2.160.84	10.2.160.84
86	10.2.160.85/32	10.2.160.85 – 10.2.160.85	10.2.160.85
87	10.2.160.86/32	10.2.160.86 – 10.2.160.86	10.2.160.86
88	10.2.160.87/32	10.2.160.87 – 10.2.160.87	10.2.160.87
89	10.2.160.88/32	10.2.160.88 – 10.2.160.88	10.2.160.88
90	10.2.160.89/32	10.2.160.89 – 10.2.160.89	10.2.160.89
91	10.2.160.90/32	10.2.160.90 – 10.2.160.90	10.2.160.90
92	10.2.160.91/32	10.2.160.91 – 10.2.160.91	10.2.160.91
93	10.2.160.92/32	10.2.160.92 – 10.2.160.92	10.2.160.92
94	10.2.160.93/32	10.2.160.93 – 10.2.160.93	10.2.160.93
95	10.2.160.94/32	10.2.160.94 – 10.2.160.94	10.2.160.94
96	10.2.160.95/32	10.2.160.95 – 10.2.160.95	10.2.160.95
97	10.2.160.96/32	10.2.160.96 – 10.2.160.96	10.2.160.96
98	10.2.160.97/32	10.2.160.97 – 10.2.160.97	10.2.160.97
99	10.2.160.98/32	10.2.160.98 – 10.2.160.98	10.2.160.98
100	10.2.160.99/32	10.2.160.99 – 10.2.160.99	10.2.160.99
101	10.2.160.100/32	10.2.160.100 – 10.2.160.100	10.2.160.100
102	10.2.160.101/32	10.2.160.101 – 10.2.160.101	10.2.160.101
103	10.2.160.102/32	10.2.160.102 – 10.2.160.102	10.2.160.102
104	10.2.160.103/32	10.2.160.103 – 10.2.160.103	10.2.160.103
105	10.2.160.104/32	10.2.160.104 – 10.2.160.104	10.2.160.104
106	10.2.160.105/32	10.2.160.105 – 10.2.160.105	10.2.160.105
107	10.2.160.106/32	10.2.160.106 – 10.2.160.106	10.2.160.106
108	10.2.160.107/32	10.2.160.107 – 10.2.160.107	10.2.160.107
109	10.2.160.108/32	10.2.160.108 – 10.2.160.108	10.2.160.108
110	10.2.160.109/32	10.2.160.109 – 10.2.160.109	10.2.160.109
111	10.2.160.110/32	10.2.160.110 – 10.2.160.110	10.2.160.110
112	10.2.160.111/32	10.2.160.111 – 10.2.160.111	10.2.160.111
113	10.2.160.112/32	10.2.160.112 – 10.2.160.112	10.2.160.112
114	10.2.160.113/32	10.2.160.113 – 10.2.160.113	10.2.160.113
115	10.2.160.114/32	10.2.160.114 – 10.2.160.114	10.2.160.114
116	10.2.160.115/32	10.2.160.115 – 10.2.160.115	10.2.160.115
117	10.2.160.116/32	10.2.160.116 – 10.2.160.116	10.2.160.116
118	10.2.160.117/32	10.2.160.117 – 10.2.160.117	10.2.160.117
119	10.2.160.118/32	10.2.160.118 – 10.2.160.118	10.2.160.118
120	10.2.160.119/32	10.2.160.119 – 10.2.160.119	10.2.160.119
121	10.2.160.120/32	10.2.160.120 – 10.2.160.120	10.2.160.120
122	10.2.160.121/32	10.2.160.121 – 10.2.160.121	10.2.160.121
123	10.2.160.122/32	10.2.160.122 – 10.2.160.122	10.2.160.122
124	10.2.160.123/32	10.2.160.123 – 10.2.160.123	10.2.160.123
125	10.2.160.124/32	10.2.160.124 – 10.2.160.124	10.2.160.124
126	10.2.160.125/32	10.2.160.125 – 10.2.160.125	10.2.160.125
127	10.2.160.126/32	10.2.160.126 – 10.2.160.126	10.2.160.126
128	10.2.160.127/32	10.2.160.127 – 10.2.160.127	10.2.160.127

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 →