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)10.2.122.0/25

network10.2.122.0/25

broadcast10.2.122.127

first host10.2.122.1

last host10.2.122.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.122.0/25

address00001010.00000010.01111010.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.01111010.00000000

broadcast00001010.00000010.01111010.01111111

green = network part, grey = host part

hex0x0a027a00

decimal167934464

reverse dns0.122.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:7a00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.122.0/32	10.2.122.0 – 10.2.122.0	10.2.122.0
2	10.2.122.1/32	10.2.122.1 – 10.2.122.1	10.2.122.1
3	10.2.122.2/32	10.2.122.2 – 10.2.122.2	10.2.122.2
4	10.2.122.3/32	10.2.122.3 – 10.2.122.3	10.2.122.3
5	10.2.122.4/32	10.2.122.4 – 10.2.122.4	10.2.122.4
6	10.2.122.5/32	10.2.122.5 – 10.2.122.5	10.2.122.5
7	10.2.122.6/32	10.2.122.6 – 10.2.122.6	10.2.122.6
8	10.2.122.7/32	10.2.122.7 – 10.2.122.7	10.2.122.7
9	10.2.122.8/32	10.2.122.8 – 10.2.122.8	10.2.122.8
10	10.2.122.9/32	10.2.122.9 – 10.2.122.9	10.2.122.9
11	10.2.122.10/32	10.2.122.10 – 10.2.122.10	10.2.122.10
12	10.2.122.11/32	10.2.122.11 – 10.2.122.11	10.2.122.11
13	10.2.122.12/32	10.2.122.12 – 10.2.122.12	10.2.122.12
14	10.2.122.13/32	10.2.122.13 – 10.2.122.13	10.2.122.13
15	10.2.122.14/32	10.2.122.14 – 10.2.122.14	10.2.122.14
16	10.2.122.15/32	10.2.122.15 – 10.2.122.15	10.2.122.15
17	10.2.122.16/32	10.2.122.16 – 10.2.122.16	10.2.122.16
18	10.2.122.17/32	10.2.122.17 – 10.2.122.17	10.2.122.17
19	10.2.122.18/32	10.2.122.18 – 10.2.122.18	10.2.122.18
20	10.2.122.19/32	10.2.122.19 – 10.2.122.19	10.2.122.19
21	10.2.122.20/32	10.2.122.20 – 10.2.122.20	10.2.122.20
22	10.2.122.21/32	10.2.122.21 – 10.2.122.21	10.2.122.21
23	10.2.122.22/32	10.2.122.22 – 10.2.122.22	10.2.122.22
24	10.2.122.23/32	10.2.122.23 – 10.2.122.23	10.2.122.23
25	10.2.122.24/32	10.2.122.24 – 10.2.122.24	10.2.122.24
26	10.2.122.25/32	10.2.122.25 – 10.2.122.25	10.2.122.25
27	10.2.122.26/32	10.2.122.26 – 10.2.122.26	10.2.122.26
28	10.2.122.27/32	10.2.122.27 – 10.2.122.27	10.2.122.27
29	10.2.122.28/32	10.2.122.28 – 10.2.122.28	10.2.122.28
30	10.2.122.29/32	10.2.122.29 – 10.2.122.29	10.2.122.29
31	10.2.122.30/32	10.2.122.30 – 10.2.122.30	10.2.122.30
32	10.2.122.31/32	10.2.122.31 – 10.2.122.31	10.2.122.31
33	10.2.122.32/32	10.2.122.32 – 10.2.122.32	10.2.122.32
34	10.2.122.33/32	10.2.122.33 – 10.2.122.33	10.2.122.33
35	10.2.122.34/32	10.2.122.34 – 10.2.122.34	10.2.122.34
36	10.2.122.35/32	10.2.122.35 – 10.2.122.35	10.2.122.35
37	10.2.122.36/32	10.2.122.36 – 10.2.122.36	10.2.122.36
38	10.2.122.37/32	10.2.122.37 – 10.2.122.37	10.2.122.37
39	10.2.122.38/32	10.2.122.38 – 10.2.122.38	10.2.122.38
40	10.2.122.39/32	10.2.122.39 – 10.2.122.39	10.2.122.39
41	10.2.122.40/32	10.2.122.40 – 10.2.122.40	10.2.122.40
42	10.2.122.41/32	10.2.122.41 – 10.2.122.41	10.2.122.41
43	10.2.122.42/32	10.2.122.42 – 10.2.122.42	10.2.122.42
44	10.2.122.43/32	10.2.122.43 – 10.2.122.43	10.2.122.43
45	10.2.122.44/32	10.2.122.44 – 10.2.122.44	10.2.122.44
46	10.2.122.45/32	10.2.122.45 – 10.2.122.45	10.2.122.45
47	10.2.122.46/32	10.2.122.46 – 10.2.122.46	10.2.122.46
48	10.2.122.47/32	10.2.122.47 – 10.2.122.47	10.2.122.47
49	10.2.122.48/32	10.2.122.48 – 10.2.122.48	10.2.122.48
50	10.2.122.49/32	10.2.122.49 – 10.2.122.49	10.2.122.49
51	10.2.122.50/32	10.2.122.50 – 10.2.122.50	10.2.122.50
52	10.2.122.51/32	10.2.122.51 – 10.2.122.51	10.2.122.51
53	10.2.122.52/32	10.2.122.52 – 10.2.122.52	10.2.122.52
54	10.2.122.53/32	10.2.122.53 – 10.2.122.53	10.2.122.53
55	10.2.122.54/32	10.2.122.54 – 10.2.122.54	10.2.122.54
56	10.2.122.55/32	10.2.122.55 – 10.2.122.55	10.2.122.55
57	10.2.122.56/32	10.2.122.56 – 10.2.122.56	10.2.122.56
58	10.2.122.57/32	10.2.122.57 – 10.2.122.57	10.2.122.57
59	10.2.122.58/32	10.2.122.58 – 10.2.122.58	10.2.122.58
60	10.2.122.59/32	10.2.122.59 – 10.2.122.59	10.2.122.59
61	10.2.122.60/32	10.2.122.60 – 10.2.122.60	10.2.122.60
62	10.2.122.61/32	10.2.122.61 – 10.2.122.61	10.2.122.61
63	10.2.122.62/32	10.2.122.62 – 10.2.122.62	10.2.122.62
64	10.2.122.63/32	10.2.122.63 – 10.2.122.63	10.2.122.63
65	10.2.122.64/32	10.2.122.64 – 10.2.122.64	10.2.122.64
66	10.2.122.65/32	10.2.122.65 – 10.2.122.65	10.2.122.65
67	10.2.122.66/32	10.2.122.66 – 10.2.122.66	10.2.122.66
68	10.2.122.67/32	10.2.122.67 – 10.2.122.67	10.2.122.67
69	10.2.122.68/32	10.2.122.68 – 10.2.122.68	10.2.122.68
70	10.2.122.69/32	10.2.122.69 – 10.2.122.69	10.2.122.69
71	10.2.122.70/32	10.2.122.70 – 10.2.122.70	10.2.122.70
72	10.2.122.71/32	10.2.122.71 – 10.2.122.71	10.2.122.71
73	10.2.122.72/32	10.2.122.72 – 10.2.122.72	10.2.122.72
74	10.2.122.73/32	10.2.122.73 – 10.2.122.73	10.2.122.73
75	10.2.122.74/32	10.2.122.74 – 10.2.122.74	10.2.122.74
76	10.2.122.75/32	10.2.122.75 – 10.2.122.75	10.2.122.75
77	10.2.122.76/32	10.2.122.76 – 10.2.122.76	10.2.122.76
78	10.2.122.77/32	10.2.122.77 – 10.2.122.77	10.2.122.77
79	10.2.122.78/32	10.2.122.78 – 10.2.122.78	10.2.122.78
80	10.2.122.79/32	10.2.122.79 – 10.2.122.79	10.2.122.79
81	10.2.122.80/32	10.2.122.80 – 10.2.122.80	10.2.122.80
82	10.2.122.81/32	10.2.122.81 – 10.2.122.81	10.2.122.81
83	10.2.122.82/32	10.2.122.82 – 10.2.122.82	10.2.122.82
84	10.2.122.83/32	10.2.122.83 – 10.2.122.83	10.2.122.83
85	10.2.122.84/32	10.2.122.84 – 10.2.122.84	10.2.122.84
86	10.2.122.85/32	10.2.122.85 – 10.2.122.85	10.2.122.85
87	10.2.122.86/32	10.2.122.86 – 10.2.122.86	10.2.122.86
88	10.2.122.87/32	10.2.122.87 – 10.2.122.87	10.2.122.87
89	10.2.122.88/32	10.2.122.88 – 10.2.122.88	10.2.122.88
90	10.2.122.89/32	10.2.122.89 – 10.2.122.89	10.2.122.89
91	10.2.122.90/32	10.2.122.90 – 10.2.122.90	10.2.122.90
92	10.2.122.91/32	10.2.122.91 – 10.2.122.91	10.2.122.91
93	10.2.122.92/32	10.2.122.92 – 10.2.122.92	10.2.122.92
94	10.2.122.93/32	10.2.122.93 – 10.2.122.93	10.2.122.93
95	10.2.122.94/32	10.2.122.94 – 10.2.122.94	10.2.122.94
96	10.2.122.95/32	10.2.122.95 – 10.2.122.95	10.2.122.95
97	10.2.122.96/32	10.2.122.96 – 10.2.122.96	10.2.122.96
98	10.2.122.97/32	10.2.122.97 – 10.2.122.97	10.2.122.97
99	10.2.122.98/32	10.2.122.98 – 10.2.122.98	10.2.122.98
100	10.2.122.99/32	10.2.122.99 – 10.2.122.99	10.2.122.99
101	10.2.122.100/32	10.2.122.100 – 10.2.122.100	10.2.122.100
102	10.2.122.101/32	10.2.122.101 – 10.2.122.101	10.2.122.101
103	10.2.122.102/32	10.2.122.102 – 10.2.122.102	10.2.122.102
104	10.2.122.103/32	10.2.122.103 – 10.2.122.103	10.2.122.103
105	10.2.122.104/32	10.2.122.104 – 10.2.122.104	10.2.122.104
106	10.2.122.105/32	10.2.122.105 – 10.2.122.105	10.2.122.105
107	10.2.122.106/32	10.2.122.106 – 10.2.122.106	10.2.122.106
108	10.2.122.107/32	10.2.122.107 – 10.2.122.107	10.2.122.107
109	10.2.122.108/32	10.2.122.108 – 10.2.122.108	10.2.122.108
110	10.2.122.109/32	10.2.122.109 – 10.2.122.109	10.2.122.109
111	10.2.122.110/32	10.2.122.110 – 10.2.122.110	10.2.122.110
112	10.2.122.111/32	10.2.122.111 – 10.2.122.111	10.2.122.111
113	10.2.122.112/32	10.2.122.112 – 10.2.122.112	10.2.122.112
114	10.2.122.113/32	10.2.122.113 – 10.2.122.113	10.2.122.113
115	10.2.122.114/32	10.2.122.114 – 10.2.122.114	10.2.122.114
116	10.2.122.115/32	10.2.122.115 – 10.2.122.115	10.2.122.115
117	10.2.122.116/32	10.2.122.116 – 10.2.122.116	10.2.122.116
118	10.2.122.117/32	10.2.122.117 – 10.2.122.117	10.2.122.117
119	10.2.122.118/32	10.2.122.118 – 10.2.122.118	10.2.122.118
120	10.2.122.119/32	10.2.122.119 – 10.2.122.119	10.2.122.119
121	10.2.122.120/32	10.2.122.120 – 10.2.122.120	10.2.122.120
122	10.2.122.121/32	10.2.122.121 – 10.2.122.121	10.2.122.121
123	10.2.122.122/32	10.2.122.122 – 10.2.122.122	10.2.122.122
124	10.2.122.123/32	10.2.122.123 – 10.2.122.123	10.2.122.123
125	10.2.122.124/32	10.2.122.124 – 10.2.122.124	10.2.122.124
126	10.2.122.125/32	10.2.122.125 – 10.2.122.125	10.2.122.125
127	10.2.122.126/32	10.2.122.126 – 10.2.122.126	10.2.122.126
128	10.2.122.127/32	10.2.122.127 – 10.2.122.127	10.2.122.127

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 →