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)10.2.134.0/25

network10.2.134.0/25

broadcast10.2.134.127

first host10.2.134.1

last host10.2.134.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.134.0/25

address00001010.00000010.10000110.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.10000110.00000000

broadcast00001010.00000010.10000110.01111111

green = network part, grey = host part

hex0x0a028600

decimal167937536

reverse dns0.134.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:8600

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.134.0/32	10.2.134.0 – 10.2.134.0	10.2.134.0
2	10.2.134.1/32	10.2.134.1 – 10.2.134.1	10.2.134.1
3	10.2.134.2/32	10.2.134.2 – 10.2.134.2	10.2.134.2
4	10.2.134.3/32	10.2.134.3 – 10.2.134.3	10.2.134.3
5	10.2.134.4/32	10.2.134.4 – 10.2.134.4	10.2.134.4
6	10.2.134.5/32	10.2.134.5 – 10.2.134.5	10.2.134.5
7	10.2.134.6/32	10.2.134.6 – 10.2.134.6	10.2.134.6
8	10.2.134.7/32	10.2.134.7 – 10.2.134.7	10.2.134.7
9	10.2.134.8/32	10.2.134.8 – 10.2.134.8	10.2.134.8
10	10.2.134.9/32	10.2.134.9 – 10.2.134.9	10.2.134.9
11	10.2.134.10/32	10.2.134.10 – 10.2.134.10	10.2.134.10
12	10.2.134.11/32	10.2.134.11 – 10.2.134.11	10.2.134.11
13	10.2.134.12/32	10.2.134.12 – 10.2.134.12	10.2.134.12
14	10.2.134.13/32	10.2.134.13 – 10.2.134.13	10.2.134.13
15	10.2.134.14/32	10.2.134.14 – 10.2.134.14	10.2.134.14
16	10.2.134.15/32	10.2.134.15 – 10.2.134.15	10.2.134.15
17	10.2.134.16/32	10.2.134.16 – 10.2.134.16	10.2.134.16
18	10.2.134.17/32	10.2.134.17 – 10.2.134.17	10.2.134.17
19	10.2.134.18/32	10.2.134.18 – 10.2.134.18	10.2.134.18
20	10.2.134.19/32	10.2.134.19 – 10.2.134.19	10.2.134.19
21	10.2.134.20/32	10.2.134.20 – 10.2.134.20	10.2.134.20
22	10.2.134.21/32	10.2.134.21 – 10.2.134.21	10.2.134.21
23	10.2.134.22/32	10.2.134.22 – 10.2.134.22	10.2.134.22
24	10.2.134.23/32	10.2.134.23 – 10.2.134.23	10.2.134.23
25	10.2.134.24/32	10.2.134.24 – 10.2.134.24	10.2.134.24
26	10.2.134.25/32	10.2.134.25 – 10.2.134.25	10.2.134.25
27	10.2.134.26/32	10.2.134.26 – 10.2.134.26	10.2.134.26
28	10.2.134.27/32	10.2.134.27 – 10.2.134.27	10.2.134.27
29	10.2.134.28/32	10.2.134.28 – 10.2.134.28	10.2.134.28
30	10.2.134.29/32	10.2.134.29 – 10.2.134.29	10.2.134.29
31	10.2.134.30/32	10.2.134.30 – 10.2.134.30	10.2.134.30
32	10.2.134.31/32	10.2.134.31 – 10.2.134.31	10.2.134.31
33	10.2.134.32/32	10.2.134.32 – 10.2.134.32	10.2.134.32
34	10.2.134.33/32	10.2.134.33 – 10.2.134.33	10.2.134.33
35	10.2.134.34/32	10.2.134.34 – 10.2.134.34	10.2.134.34
36	10.2.134.35/32	10.2.134.35 – 10.2.134.35	10.2.134.35
37	10.2.134.36/32	10.2.134.36 – 10.2.134.36	10.2.134.36
38	10.2.134.37/32	10.2.134.37 – 10.2.134.37	10.2.134.37
39	10.2.134.38/32	10.2.134.38 – 10.2.134.38	10.2.134.38
40	10.2.134.39/32	10.2.134.39 – 10.2.134.39	10.2.134.39
41	10.2.134.40/32	10.2.134.40 – 10.2.134.40	10.2.134.40
42	10.2.134.41/32	10.2.134.41 – 10.2.134.41	10.2.134.41
43	10.2.134.42/32	10.2.134.42 – 10.2.134.42	10.2.134.42
44	10.2.134.43/32	10.2.134.43 – 10.2.134.43	10.2.134.43
45	10.2.134.44/32	10.2.134.44 – 10.2.134.44	10.2.134.44
46	10.2.134.45/32	10.2.134.45 – 10.2.134.45	10.2.134.45
47	10.2.134.46/32	10.2.134.46 – 10.2.134.46	10.2.134.46
48	10.2.134.47/32	10.2.134.47 – 10.2.134.47	10.2.134.47
49	10.2.134.48/32	10.2.134.48 – 10.2.134.48	10.2.134.48
50	10.2.134.49/32	10.2.134.49 – 10.2.134.49	10.2.134.49
51	10.2.134.50/32	10.2.134.50 – 10.2.134.50	10.2.134.50
52	10.2.134.51/32	10.2.134.51 – 10.2.134.51	10.2.134.51
53	10.2.134.52/32	10.2.134.52 – 10.2.134.52	10.2.134.52
54	10.2.134.53/32	10.2.134.53 – 10.2.134.53	10.2.134.53
55	10.2.134.54/32	10.2.134.54 – 10.2.134.54	10.2.134.54
56	10.2.134.55/32	10.2.134.55 – 10.2.134.55	10.2.134.55
57	10.2.134.56/32	10.2.134.56 – 10.2.134.56	10.2.134.56
58	10.2.134.57/32	10.2.134.57 – 10.2.134.57	10.2.134.57
59	10.2.134.58/32	10.2.134.58 – 10.2.134.58	10.2.134.58
60	10.2.134.59/32	10.2.134.59 – 10.2.134.59	10.2.134.59
61	10.2.134.60/32	10.2.134.60 – 10.2.134.60	10.2.134.60
62	10.2.134.61/32	10.2.134.61 – 10.2.134.61	10.2.134.61
63	10.2.134.62/32	10.2.134.62 – 10.2.134.62	10.2.134.62
64	10.2.134.63/32	10.2.134.63 – 10.2.134.63	10.2.134.63
65	10.2.134.64/32	10.2.134.64 – 10.2.134.64	10.2.134.64
66	10.2.134.65/32	10.2.134.65 – 10.2.134.65	10.2.134.65
67	10.2.134.66/32	10.2.134.66 – 10.2.134.66	10.2.134.66
68	10.2.134.67/32	10.2.134.67 – 10.2.134.67	10.2.134.67
69	10.2.134.68/32	10.2.134.68 – 10.2.134.68	10.2.134.68
70	10.2.134.69/32	10.2.134.69 – 10.2.134.69	10.2.134.69
71	10.2.134.70/32	10.2.134.70 – 10.2.134.70	10.2.134.70
72	10.2.134.71/32	10.2.134.71 – 10.2.134.71	10.2.134.71
73	10.2.134.72/32	10.2.134.72 – 10.2.134.72	10.2.134.72
74	10.2.134.73/32	10.2.134.73 – 10.2.134.73	10.2.134.73
75	10.2.134.74/32	10.2.134.74 – 10.2.134.74	10.2.134.74
76	10.2.134.75/32	10.2.134.75 – 10.2.134.75	10.2.134.75
77	10.2.134.76/32	10.2.134.76 – 10.2.134.76	10.2.134.76
78	10.2.134.77/32	10.2.134.77 – 10.2.134.77	10.2.134.77
79	10.2.134.78/32	10.2.134.78 – 10.2.134.78	10.2.134.78
80	10.2.134.79/32	10.2.134.79 – 10.2.134.79	10.2.134.79
81	10.2.134.80/32	10.2.134.80 – 10.2.134.80	10.2.134.80
82	10.2.134.81/32	10.2.134.81 – 10.2.134.81	10.2.134.81
83	10.2.134.82/32	10.2.134.82 – 10.2.134.82	10.2.134.82
84	10.2.134.83/32	10.2.134.83 – 10.2.134.83	10.2.134.83
85	10.2.134.84/32	10.2.134.84 – 10.2.134.84	10.2.134.84
86	10.2.134.85/32	10.2.134.85 – 10.2.134.85	10.2.134.85
87	10.2.134.86/32	10.2.134.86 – 10.2.134.86	10.2.134.86
88	10.2.134.87/32	10.2.134.87 – 10.2.134.87	10.2.134.87
89	10.2.134.88/32	10.2.134.88 – 10.2.134.88	10.2.134.88
90	10.2.134.89/32	10.2.134.89 – 10.2.134.89	10.2.134.89
91	10.2.134.90/32	10.2.134.90 – 10.2.134.90	10.2.134.90
92	10.2.134.91/32	10.2.134.91 – 10.2.134.91	10.2.134.91
93	10.2.134.92/32	10.2.134.92 – 10.2.134.92	10.2.134.92
94	10.2.134.93/32	10.2.134.93 – 10.2.134.93	10.2.134.93
95	10.2.134.94/32	10.2.134.94 – 10.2.134.94	10.2.134.94
96	10.2.134.95/32	10.2.134.95 – 10.2.134.95	10.2.134.95
97	10.2.134.96/32	10.2.134.96 – 10.2.134.96	10.2.134.96
98	10.2.134.97/32	10.2.134.97 – 10.2.134.97	10.2.134.97
99	10.2.134.98/32	10.2.134.98 – 10.2.134.98	10.2.134.98
100	10.2.134.99/32	10.2.134.99 – 10.2.134.99	10.2.134.99
101	10.2.134.100/32	10.2.134.100 – 10.2.134.100	10.2.134.100
102	10.2.134.101/32	10.2.134.101 – 10.2.134.101	10.2.134.101
103	10.2.134.102/32	10.2.134.102 – 10.2.134.102	10.2.134.102
104	10.2.134.103/32	10.2.134.103 – 10.2.134.103	10.2.134.103
105	10.2.134.104/32	10.2.134.104 – 10.2.134.104	10.2.134.104
106	10.2.134.105/32	10.2.134.105 – 10.2.134.105	10.2.134.105
107	10.2.134.106/32	10.2.134.106 – 10.2.134.106	10.2.134.106
108	10.2.134.107/32	10.2.134.107 – 10.2.134.107	10.2.134.107
109	10.2.134.108/32	10.2.134.108 – 10.2.134.108	10.2.134.108
110	10.2.134.109/32	10.2.134.109 – 10.2.134.109	10.2.134.109
111	10.2.134.110/32	10.2.134.110 – 10.2.134.110	10.2.134.110
112	10.2.134.111/32	10.2.134.111 – 10.2.134.111	10.2.134.111
113	10.2.134.112/32	10.2.134.112 – 10.2.134.112	10.2.134.112
114	10.2.134.113/32	10.2.134.113 – 10.2.134.113	10.2.134.113
115	10.2.134.114/32	10.2.134.114 – 10.2.134.114	10.2.134.114
116	10.2.134.115/32	10.2.134.115 – 10.2.134.115	10.2.134.115
117	10.2.134.116/32	10.2.134.116 – 10.2.134.116	10.2.134.116
118	10.2.134.117/32	10.2.134.117 – 10.2.134.117	10.2.134.117
119	10.2.134.118/32	10.2.134.118 – 10.2.134.118	10.2.134.118
120	10.2.134.119/32	10.2.134.119 – 10.2.134.119	10.2.134.119
121	10.2.134.120/32	10.2.134.120 – 10.2.134.120	10.2.134.120
122	10.2.134.121/32	10.2.134.121 – 10.2.134.121	10.2.134.121
123	10.2.134.122/32	10.2.134.122 – 10.2.134.122	10.2.134.122
124	10.2.134.123/32	10.2.134.123 – 10.2.134.123	10.2.134.123
125	10.2.134.124/32	10.2.134.124 – 10.2.134.124	10.2.134.124
126	10.2.134.125/32	10.2.134.125 – 10.2.134.125	10.2.134.125
127	10.2.134.126/32	10.2.134.126 – 10.2.134.126	10.2.134.126
128	10.2.134.127/32	10.2.134.127 – 10.2.134.127	10.2.134.127

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 →