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)10.2.235.0/25

network10.2.235.0/25

broadcast10.2.235.127

first host10.2.235.1

last host10.2.235.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.235.0/25

address00001010.00000010.11101011.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.11101011.00000000

broadcast00001010.00000010.11101011.01111111

green = network part, grey = host part

hex0x0a02eb00

decimal167963392

reverse dns0.235.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:eb00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.235.0/32	10.2.235.0 – 10.2.235.0	10.2.235.0
2	10.2.235.1/32	10.2.235.1 – 10.2.235.1	10.2.235.1
3	10.2.235.2/32	10.2.235.2 – 10.2.235.2	10.2.235.2
4	10.2.235.3/32	10.2.235.3 – 10.2.235.3	10.2.235.3
5	10.2.235.4/32	10.2.235.4 – 10.2.235.4	10.2.235.4
6	10.2.235.5/32	10.2.235.5 – 10.2.235.5	10.2.235.5
7	10.2.235.6/32	10.2.235.6 – 10.2.235.6	10.2.235.6
8	10.2.235.7/32	10.2.235.7 – 10.2.235.7	10.2.235.7
9	10.2.235.8/32	10.2.235.8 – 10.2.235.8	10.2.235.8
10	10.2.235.9/32	10.2.235.9 – 10.2.235.9	10.2.235.9
11	10.2.235.10/32	10.2.235.10 – 10.2.235.10	10.2.235.10
12	10.2.235.11/32	10.2.235.11 – 10.2.235.11	10.2.235.11
13	10.2.235.12/32	10.2.235.12 – 10.2.235.12	10.2.235.12
14	10.2.235.13/32	10.2.235.13 – 10.2.235.13	10.2.235.13
15	10.2.235.14/32	10.2.235.14 – 10.2.235.14	10.2.235.14
16	10.2.235.15/32	10.2.235.15 – 10.2.235.15	10.2.235.15
17	10.2.235.16/32	10.2.235.16 – 10.2.235.16	10.2.235.16
18	10.2.235.17/32	10.2.235.17 – 10.2.235.17	10.2.235.17
19	10.2.235.18/32	10.2.235.18 – 10.2.235.18	10.2.235.18
20	10.2.235.19/32	10.2.235.19 – 10.2.235.19	10.2.235.19
21	10.2.235.20/32	10.2.235.20 – 10.2.235.20	10.2.235.20
22	10.2.235.21/32	10.2.235.21 – 10.2.235.21	10.2.235.21
23	10.2.235.22/32	10.2.235.22 – 10.2.235.22	10.2.235.22
24	10.2.235.23/32	10.2.235.23 – 10.2.235.23	10.2.235.23
25	10.2.235.24/32	10.2.235.24 – 10.2.235.24	10.2.235.24
26	10.2.235.25/32	10.2.235.25 – 10.2.235.25	10.2.235.25
27	10.2.235.26/32	10.2.235.26 – 10.2.235.26	10.2.235.26
28	10.2.235.27/32	10.2.235.27 – 10.2.235.27	10.2.235.27
29	10.2.235.28/32	10.2.235.28 – 10.2.235.28	10.2.235.28
30	10.2.235.29/32	10.2.235.29 – 10.2.235.29	10.2.235.29
31	10.2.235.30/32	10.2.235.30 – 10.2.235.30	10.2.235.30
32	10.2.235.31/32	10.2.235.31 – 10.2.235.31	10.2.235.31
33	10.2.235.32/32	10.2.235.32 – 10.2.235.32	10.2.235.32
34	10.2.235.33/32	10.2.235.33 – 10.2.235.33	10.2.235.33
35	10.2.235.34/32	10.2.235.34 – 10.2.235.34	10.2.235.34
36	10.2.235.35/32	10.2.235.35 – 10.2.235.35	10.2.235.35
37	10.2.235.36/32	10.2.235.36 – 10.2.235.36	10.2.235.36
38	10.2.235.37/32	10.2.235.37 – 10.2.235.37	10.2.235.37
39	10.2.235.38/32	10.2.235.38 – 10.2.235.38	10.2.235.38
40	10.2.235.39/32	10.2.235.39 – 10.2.235.39	10.2.235.39
41	10.2.235.40/32	10.2.235.40 – 10.2.235.40	10.2.235.40
42	10.2.235.41/32	10.2.235.41 – 10.2.235.41	10.2.235.41
43	10.2.235.42/32	10.2.235.42 – 10.2.235.42	10.2.235.42
44	10.2.235.43/32	10.2.235.43 – 10.2.235.43	10.2.235.43
45	10.2.235.44/32	10.2.235.44 – 10.2.235.44	10.2.235.44
46	10.2.235.45/32	10.2.235.45 – 10.2.235.45	10.2.235.45
47	10.2.235.46/32	10.2.235.46 – 10.2.235.46	10.2.235.46
48	10.2.235.47/32	10.2.235.47 – 10.2.235.47	10.2.235.47
49	10.2.235.48/32	10.2.235.48 – 10.2.235.48	10.2.235.48
50	10.2.235.49/32	10.2.235.49 – 10.2.235.49	10.2.235.49
51	10.2.235.50/32	10.2.235.50 – 10.2.235.50	10.2.235.50
52	10.2.235.51/32	10.2.235.51 – 10.2.235.51	10.2.235.51
53	10.2.235.52/32	10.2.235.52 – 10.2.235.52	10.2.235.52
54	10.2.235.53/32	10.2.235.53 – 10.2.235.53	10.2.235.53
55	10.2.235.54/32	10.2.235.54 – 10.2.235.54	10.2.235.54
56	10.2.235.55/32	10.2.235.55 – 10.2.235.55	10.2.235.55
57	10.2.235.56/32	10.2.235.56 – 10.2.235.56	10.2.235.56
58	10.2.235.57/32	10.2.235.57 – 10.2.235.57	10.2.235.57
59	10.2.235.58/32	10.2.235.58 – 10.2.235.58	10.2.235.58
60	10.2.235.59/32	10.2.235.59 – 10.2.235.59	10.2.235.59
61	10.2.235.60/32	10.2.235.60 – 10.2.235.60	10.2.235.60
62	10.2.235.61/32	10.2.235.61 – 10.2.235.61	10.2.235.61
63	10.2.235.62/32	10.2.235.62 – 10.2.235.62	10.2.235.62
64	10.2.235.63/32	10.2.235.63 – 10.2.235.63	10.2.235.63
65	10.2.235.64/32	10.2.235.64 – 10.2.235.64	10.2.235.64
66	10.2.235.65/32	10.2.235.65 – 10.2.235.65	10.2.235.65
67	10.2.235.66/32	10.2.235.66 – 10.2.235.66	10.2.235.66
68	10.2.235.67/32	10.2.235.67 – 10.2.235.67	10.2.235.67
69	10.2.235.68/32	10.2.235.68 – 10.2.235.68	10.2.235.68
70	10.2.235.69/32	10.2.235.69 – 10.2.235.69	10.2.235.69
71	10.2.235.70/32	10.2.235.70 – 10.2.235.70	10.2.235.70
72	10.2.235.71/32	10.2.235.71 – 10.2.235.71	10.2.235.71
73	10.2.235.72/32	10.2.235.72 – 10.2.235.72	10.2.235.72
74	10.2.235.73/32	10.2.235.73 – 10.2.235.73	10.2.235.73
75	10.2.235.74/32	10.2.235.74 – 10.2.235.74	10.2.235.74
76	10.2.235.75/32	10.2.235.75 – 10.2.235.75	10.2.235.75
77	10.2.235.76/32	10.2.235.76 – 10.2.235.76	10.2.235.76
78	10.2.235.77/32	10.2.235.77 – 10.2.235.77	10.2.235.77
79	10.2.235.78/32	10.2.235.78 – 10.2.235.78	10.2.235.78
80	10.2.235.79/32	10.2.235.79 – 10.2.235.79	10.2.235.79
81	10.2.235.80/32	10.2.235.80 – 10.2.235.80	10.2.235.80
82	10.2.235.81/32	10.2.235.81 – 10.2.235.81	10.2.235.81
83	10.2.235.82/32	10.2.235.82 – 10.2.235.82	10.2.235.82
84	10.2.235.83/32	10.2.235.83 – 10.2.235.83	10.2.235.83
85	10.2.235.84/32	10.2.235.84 – 10.2.235.84	10.2.235.84
86	10.2.235.85/32	10.2.235.85 – 10.2.235.85	10.2.235.85
87	10.2.235.86/32	10.2.235.86 – 10.2.235.86	10.2.235.86
88	10.2.235.87/32	10.2.235.87 – 10.2.235.87	10.2.235.87
89	10.2.235.88/32	10.2.235.88 – 10.2.235.88	10.2.235.88
90	10.2.235.89/32	10.2.235.89 – 10.2.235.89	10.2.235.89
91	10.2.235.90/32	10.2.235.90 – 10.2.235.90	10.2.235.90
92	10.2.235.91/32	10.2.235.91 – 10.2.235.91	10.2.235.91
93	10.2.235.92/32	10.2.235.92 – 10.2.235.92	10.2.235.92
94	10.2.235.93/32	10.2.235.93 – 10.2.235.93	10.2.235.93
95	10.2.235.94/32	10.2.235.94 – 10.2.235.94	10.2.235.94
96	10.2.235.95/32	10.2.235.95 – 10.2.235.95	10.2.235.95
97	10.2.235.96/32	10.2.235.96 – 10.2.235.96	10.2.235.96
98	10.2.235.97/32	10.2.235.97 – 10.2.235.97	10.2.235.97
99	10.2.235.98/32	10.2.235.98 – 10.2.235.98	10.2.235.98
100	10.2.235.99/32	10.2.235.99 – 10.2.235.99	10.2.235.99
101	10.2.235.100/32	10.2.235.100 – 10.2.235.100	10.2.235.100
102	10.2.235.101/32	10.2.235.101 – 10.2.235.101	10.2.235.101
103	10.2.235.102/32	10.2.235.102 – 10.2.235.102	10.2.235.102
104	10.2.235.103/32	10.2.235.103 – 10.2.235.103	10.2.235.103
105	10.2.235.104/32	10.2.235.104 – 10.2.235.104	10.2.235.104
106	10.2.235.105/32	10.2.235.105 – 10.2.235.105	10.2.235.105
107	10.2.235.106/32	10.2.235.106 – 10.2.235.106	10.2.235.106
108	10.2.235.107/32	10.2.235.107 – 10.2.235.107	10.2.235.107
109	10.2.235.108/32	10.2.235.108 – 10.2.235.108	10.2.235.108
110	10.2.235.109/32	10.2.235.109 – 10.2.235.109	10.2.235.109
111	10.2.235.110/32	10.2.235.110 – 10.2.235.110	10.2.235.110
112	10.2.235.111/32	10.2.235.111 – 10.2.235.111	10.2.235.111
113	10.2.235.112/32	10.2.235.112 – 10.2.235.112	10.2.235.112
114	10.2.235.113/32	10.2.235.113 – 10.2.235.113	10.2.235.113
115	10.2.235.114/32	10.2.235.114 – 10.2.235.114	10.2.235.114
116	10.2.235.115/32	10.2.235.115 – 10.2.235.115	10.2.235.115
117	10.2.235.116/32	10.2.235.116 – 10.2.235.116	10.2.235.116
118	10.2.235.117/32	10.2.235.117 – 10.2.235.117	10.2.235.117
119	10.2.235.118/32	10.2.235.118 – 10.2.235.118	10.2.235.118
120	10.2.235.119/32	10.2.235.119 – 10.2.235.119	10.2.235.119
121	10.2.235.120/32	10.2.235.120 – 10.2.235.120	10.2.235.120
122	10.2.235.121/32	10.2.235.121 – 10.2.235.121	10.2.235.121
123	10.2.235.122/32	10.2.235.122 – 10.2.235.122	10.2.235.122
124	10.2.235.123/32	10.2.235.123 – 10.2.235.123	10.2.235.123
125	10.2.235.124/32	10.2.235.124 – 10.2.235.124	10.2.235.124
126	10.2.235.125/32	10.2.235.125 – 10.2.235.125	10.2.235.125
127	10.2.235.126/32	10.2.235.126 – 10.2.235.126	10.2.235.126
128	10.2.235.127/32	10.2.235.127 – 10.2.235.127	10.2.235.127

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 →