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)10.2.6.0/25

network10.2.6.0/25

broadcast10.2.6.127

first host10.2.6.1

last host10.2.6.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.6.0/25

address00001010.00000010.00000110.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.00000110.00000000

broadcast00001010.00000010.00000110.01111111

green = network part, grey = host part

hex0x0a020600

decimal167904768

reverse dns0.6.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:600

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.6.0/32	10.2.6.0 – 10.2.6.0	10.2.6.0
2	10.2.6.1/32	10.2.6.1 – 10.2.6.1	10.2.6.1
3	10.2.6.2/32	10.2.6.2 – 10.2.6.2	10.2.6.2
4	10.2.6.3/32	10.2.6.3 – 10.2.6.3	10.2.6.3
5	10.2.6.4/32	10.2.6.4 – 10.2.6.4	10.2.6.4
6	10.2.6.5/32	10.2.6.5 – 10.2.6.5	10.2.6.5
7	10.2.6.6/32	10.2.6.6 – 10.2.6.6	10.2.6.6
8	10.2.6.7/32	10.2.6.7 – 10.2.6.7	10.2.6.7
9	10.2.6.8/32	10.2.6.8 – 10.2.6.8	10.2.6.8
10	10.2.6.9/32	10.2.6.9 – 10.2.6.9	10.2.6.9
11	10.2.6.10/32	10.2.6.10 – 10.2.6.10	10.2.6.10
12	10.2.6.11/32	10.2.6.11 – 10.2.6.11	10.2.6.11
13	10.2.6.12/32	10.2.6.12 – 10.2.6.12	10.2.6.12
14	10.2.6.13/32	10.2.6.13 – 10.2.6.13	10.2.6.13
15	10.2.6.14/32	10.2.6.14 – 10.2.6.14	10.2.6.14
16	10.2.6.15/32	10.2.6.15 – 10.2.6.15	10.2.6.15
17	10.2.6.16/32	10.2.6.16 – 10.2.6.16	10.2.6.16
18	10.2.6.17/32	10.2.6.17 – 10.2.6.17	10.2.6.17
19	10.2.6.18/32	10.2.6.18 – 10.2.6.18	10.2.6.18
20	10.2.6.19/32	10.2.6.19 – 10.2.6.19	10.2.6.19
21	10.2.6.20/32	10.2.6.20 – 10.2.6.20	10.2.6.20
22	10.2.6.21/32	10.2.6.21 – 10.2.6.21	10.2.6.21
23	10.2.6.22/32	10.2.6.22 – 10.2.6.22	10.2.6.22
24	10.2.6.23/32	10.2.6.23 – 10.2.6.23	10.2.6.23
25	10.2.6.24/32	10.2.6.24 – 10.2.6.24	10.2.6.24
26	10.2.6.25/32	10.2.6.25 – 10.2.6.25	10.2.6.25
27	10.2.6.26/32	10.2.6.26 – 10.2.6.26	10.2.6.26
28	10.2.6.27/32	10.2.6.27 – 10.2.6.27	10.2.6.27
29	10.2.6.28/32	10.2.6.28 – 10.2.6.28	10.2.6.28
30	10.2.6.29/32	10.2.6.29 – 10.2.6.29	10.2.6.29
31	10.2.6.30/32	10.2.6.30 – 10.2.6.30	10.2.6.30
32	10.2.6.31/32	10.2.6.31 – 10.2.6.31	10.2.6.31
33	10.2.6.32/32	10.2.6.32 – 10.2.6.32	10.2.6.32
34	10.2.6.33/32	10.2.6.33 – 10.2.6.33	10.2.6.33
35	10.2.6.34/32	10.2.6.34 – 10.2.6.34	10.2.6.34
36	10.2.6.35/32	10.2.6.35 – 10.2.6.35	10.2.6.35
37	10.2.6.36/32	10.2.6.36 – 10.2.6.36	10.2.6.36
38	10.2.6.37/32	10.2.6.37 – 10.2.6.37	10.2.6.37
39	10.2.6.38/32	10.2.6.38 – 10.2.6.38	10.2.6.38
40	10.2.6.39/32	10.2.6.39 – 10.2.6.39	10.2.6.39
41	10.2.6.40/32	10.2.6.40 – 10.2.6.40	10.2.6.40
42	10.2.6.41/32	10.2.6.41 – 10.2.6.41	10.2.6.41
43	10.2.6.42/32	10.2.6.42 – 10.2.6.42	10.2.6.42
44	10.2.6.43/32	10.2.6.43 – 10.2.6.43	10.2.6.43
45	10.2.6.44/32	10.2.6.44 – 10.2.6.44	10.2.6.44
46	10.2.6.45/32	10.2.6.45 – 10.2.6.45	10.2.6.45
47	10.2.6.46/32	10.2.6.46 – 10.2.6.46	10.2.6.46
48	10.2.6.47/32	10.2.6.47 – 10.2.6.47	10.2.6.47
49	10.2.6.48/32	10.2.6.48 – 10.2.6.48	10.2.6.48
50	10.2.6.49/32	10.2.6.49 – 10.2.6.49	10.2.6.49
51	10.2.6.50/32	10.2.6.50 – 10.2.6.50	10.2.6.50
52	10.2.6.51/32	10.2.6.51 – 10.2.6.51	10.2.6.51
53	10.2.6.52/32	10.2.6.52 – 10.2.6.52	10.2.6.52
54	10.2.6.53/32	10.2.6.53 – 10.2.6.53	10.2.6.53
55	10.2.6.54/32	10.2.6.54 – 10.2.6.54	10.2.6.54
56	10.2.6.55/32	10.2.6.55 – 10.2.6.55	10.2.6.55
57	10.2.6.56/32	10.2.6.56 – 10.2.6.56	10.2.6.56
58	10.2.6.57/32	10.2.6.57 – 10.2.6.57	10.2.6.57
59	10.2.6.58/32	10.2.6.58 – 10.2.6.58	10.2.6.58
60	10.2.6.59/32	10.2.6.59 – 10.2.6.59	10.2.6.59
61	10.2.6.60/32	10.2.6.60 – 10.2.6.60	10.2.6.60
62	10.2.6.61/32	10.2.6.61 – 10.2.6.61	10.2.6.61
63	10.2.6.62/32	10.2.6.62 – 10.2.6.62	10.2.6.62
64	10.2.6.63/32	10.2.6.63 – 10.2.6.63	10.2.6.63
65	10.2.6.64/32	10.2.6.64 – 10.2.6.64	10.2.6.64
66	10.2.6.65/32	10.2.6.65 – 10.2.6.65	10.2.6.65
67	10.2.6.66/32	10.2.6.66 – 10.2.6.66	10.2.6.66
68	10.2.6.67/32	10.2.6.67 – 10.2.6.67	10.2.6.67
69	10.2.6.68/32	10.2.6.68 – 10.2.6.68	10.2.6.68
70	10.2.6.69/32	10.2.6.69 – 10.2.6.69	10.2.6.69
71	10.2.6.70/32	10.2.6.70 – 10.2.6.70	10.2.6.70
72	10.2.6.71/32	10.2.6.71 – 10.2.6.71	10.2.6.71
73	10.2.6.72/32	10.2.6.72 – 10.2.6.72	10.2.6.72
74	10.2.6.73/32	10.2.6.73 – 10.2.6.73	10.2.6.73
75	10.2.6.74/32	10.2.6.74 – 10.2.6.74	10.2.6.74
76	10.2.6.75/32	10.2.6.75 – 10.2.6.75	10.2.6.75
77	10.2.6.76/32	10.2.6.76 – 10.2.6.76	10.2.6.76
78	10.2.6.77/32	10.2.6.77 – 10.2.6.77	10.2.6.77
79	10.2.6.78/32	10.2.6.78 – 10.2.6.78	10.2.6.78
80	10.2.6.79/32	10.2.6.79 – 10.2.6.79	10.2.6.79
81	10.2.6.80/32	10.2.6.80 – 10.2.6.80	10.2.6.80
82	10.2.6.81/32	10.2.6.81 – 10.2.6.81	10.2.6.81
83	10.2.6.82/32	10.2.6.82 – 10.2.6.82	10.2.6.82
84	10.2.6.83/32	10.2.6.83 – 10.2.6.83	10.2.6.83
85	10.2.6.84/32	10.2.6.84 – 10.2.6.84	10.2.6.84
86	10.2.6.85/32	10.2.6.85 – 10.2.6.85	10.2.6.85
87	10.2.6.86/32	10.2.6.86 – 10.2.6.86	10.2.6.86
88	10.2.6.87/32	10.2.6.87 – 10.2.6.87	10.2.6.87
89	10.2.6.88/32	10.2.6.88 – 10.2.6.88	10.2.6.88
90	10.2.6.89/32	10.2.6.89 – 10.2.6.89	10.2.6.89
91	10.2.6.90/32	10.2.6.90 – 10.2.6.90	10.2.6.90
92	10.2.6.91/32	10.2.6.91 – 10.2.6.91	10.2.6.91
93	10.2.6.92/32	10.2.6.92 – 10.2.6.92	10.2.6.92
94	10.2.6.93/32	10.2.6.93 – 10.2.6.93	10.2.6.93
95	10.2.6.94/32	10.2.6.94 – 10.2.6.94	10.2.6.94
96	10.2.6.95/32	10.2.6.95 – 10.2.6.95	10.2.6.95
97	10.2.6.96/32	10.2.6.96 – 10.2.6.96	10.2.6.96
98	10.2.6.97/32	10.2.6.97 – 10.2.6.97	10.2.6.97
99	10.2.6.98/32	10.2.6.98 – 10.2.6.98	10.2.6.98
100	10.2.6.99/32	10.2.6.99 – 10.2.6.99	10.2.6.99
101	10.2.6.100/32	10.2.6.100 – 10.2.6.100	10.2.6.100
102	10.2.6.101/32	10.2.6.101 – 10.2.6.101	10.2.6.101
103	10.2.6.102/32	10.2.6.102 – 10.2.6.102	10.2.6.102
104	10.2.6.103/32	10.2.6.103 – 10.2.6.103	10.2.6.103
105	10.2.6.104/32	10.2.6.104 – 10.2.6.104	10.2.6.104
106	10.2.6.105/32	10.2.6.105 – 10.2.6.105	10.2.6.105
107	10.2.6.106/32	10.2.6.106 – 10.2.6.106	10.2.6.106
108	10.2.6.107/32	10.2.6.107 – 10.2.6.107	10.2.6.107
109	10.2.6.108/32	10.2.6.108 – 10.2.6.108	10.2.6.108
110	10.2.6.109/32	10.2.6.109 – 10.2.6.109	10.2.6.109
111	10.2.6.110/32	10.2.6.110 – 10.2.6.110	10.2.6.110
112	10.2.6.111/32	10.2.6.111 – 10.2.6.111	10.2.6.111
113	10.2.6.112/32	10.2.6.112 – 10.2.6.112	10.2.6.112
114	10.2.6.113/32	10.2.6.113 – 10.2.6.113	10.2.6.113
115	10.2.6.114/32	10.2.6.114 – 10.2.6.114	10.2.6.114
116	10.2.6.115/32	10.2.6.115 – 10.2.6.115	10.2.6.115
117	10.2.6.116/32	10.2.6.116 – 10.2.6.116	10.2.6.116
118	10.2.6.117/32	10.2.6.117 – 10.2.6.117	10.2.6.117
119	10.2.6.118/32	10.2.6.118 – 10.2.6.118	10.2.6.118
120	10.2.6.119/32	10.2.6.119 – 10.2.6.119	10.2.6.119
121	10.2.6.120/32	10.2.6.120 – 10.2.6.120	10.2.6.120
122	10.2.6.121/32	10.2.6.121 – 10.2.6.121	10.2.6.121
123	10.2.6.122/32	10.2.6.122 – 10.2.6.122	10.2.6.122
124	10.2.6.123/32	10.2.6.123 – 10.2.6.123	10.2.6.123
125	10.2.6.124/32	10.2.6.124 – 10.2.6.124	10.2.6.124
126	10.2.6.125/32	10.2.6.125 – 10.2.6.125	10.2.6.125
127	10.2.6.126/32	10.2.6.126 – 10.2.6.126	10.2.6.126
128	10.2.6.127/32	10.2.6.127 – 10.2.6.127	10.2.6.127

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 →