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)10.3.233.0/25

network10.3.233.0/25

broadcast10.3.233.127

first host10.3.233.1

last host10.3.233.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.3.233.0/25

address00001010.00000011.11101001.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000011.11101001.00000000

broadcast00001010.00000011.11101001.01111111

green = network part, grey = host part

hex0x0a03e900

decimal168028416

reverse dns0.233.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:e900

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.233.0/32	10.3.233.0 – 10.3.233.0	10.3.233.0
2	10.3.233.1/32	10.3.233.1 – 10.3.233.1	10.3.233.1
3	10.3.233.2/32	10.3.233.2 – 10.3.233.2	10.3.233.2
4	10.3.233.3/32	10.3.233.3 – 10.3.233.3	10.3.233.3
5	10.3.233.4/32	10.3.233.4 – 10.3.233.4	10.3.233.4
6	10.3.233.5/32	10.3.233.5 – 10.3.233.5	10.3.233.5
7	10.3.233.6/32	10.3.233.6 – 10.3.233.6	10.3.233.6
8	10.3.233.7/32	10.3.233.7 – 10.3.233.7	10.3.233.7
9	10.3.233.8/32	10.3.233.8 – 10.3.233.8	10.3.233.8
10	10.3.233.9/32	10.3.233.9 – 10.3.233.9	10.3.233.9
11	10.3.233.10/32	10.3.233.10 – 10.3.233.10	10.3.233.10
12	10.3.233.11/32	10.3.233.11 – 10.3.233.11	10.3.233.11
13	10.3.233.12/32	10.3.233.12 – 10.3.233.12	10.3.233.12
14	10.3.233.13/32	10.3.233.13 – 10.3.233.13	10.3.233.13
15	10.3.233.14/32	10.3.233.14 – 10.3.233.14	10.3.233.14
16	10.3.233.15/32	10.3.233.15 – 10.3.233.15	10.3.233.15
17	10.3.233.16/32	10.3.233.16 – 10.3.233.16	10.3.233.16
18	10.3.233.17/32	10.3.233.17 – 10.3.233.17	10.3.233.17
19	10.3.233.18/32	10.3.233.18 – 10.3.233.18	10.3.233.18
20	10.3.233.19/32	10.3.233.19 – 10.3.233.19	10.3.233.19
21	10.3.233.20/32	10.3.233.20 – 10.3.233.20	10.3.233.20
22	10.3.233.21/32	10.3.233.21 – 10.3.233.21	10.3.233.21
23	10.3.233.22/32	10.3.233.22 – 10.3.233.22	10.3.233.22
24	10.3.233.23/32	10.3.233.23 – 10.3.233.23	10.3.233.23
25	10.3.233.24/32	10.3.233.24 – 10.3.233.24	10.3.233.24
26	10.3.233.25/32	10.3.233.25 – 10.3.233.25	10.3.233.25
27	10.3.233.26/32	10.3.233.26 – 10.3.233.26	10.3.233.26
28	10.3.233.27/32	10.3.233.27 – 10.3.233.27	10.3.233.27
29	10.3.233.28/32	10.3.233.28 – 10.3.233.28	10.3.233.28
30	10.3.233.29/32	10.3.233.29 – 10.3.233.29	10.3.233.29
31	10.3.233.30/32	10.3.233.30 – 10.3.233.30	10.3.233.30
32	10.3.233.31/32	10.3.233.31 – 10.3.233.31	10.3.233.31
33	10.3.233.32/32	10.3.233.32 – 10.3.233.32	10.3.233.32
34	10.3.233.33/32	10.3.233.33 – 10.3.233.33	10.3.233.33
35	10.3.233.34/32	10.3.233.34 – 10.3.233.34	10.3.233.34
36	10.3.233.35/32	10.3.233.35 – 10.3.233.35	10.3.233.35
37	10.3.233.36/32	10.3.233.36 – 10.3.233.36	10.3.233.36
38	10.3.233.37/32	10.3.233.37 – 10.3.233.37	10.3.233.37
39	10.3.233.38/32	10.3.233.38 – 10.3.233.38	10.3.233.38
40	10.3.233.39/32	10.3.233.39 – 10.3.233.39	10.3.233.39
41	10.3.233.40/32	10.3.233.40 – 10.3.233.40	10.3.233.40
42	10.3.233.41/32	10.3.233.41 – 10.3.233.41	10.3.233.41
43	10.3.233.42/32	10.3.233.42 – 10.3.233.42	10.3.233.42
44	10.3.233.43/32	10.3.233.43 – 10.3.233.43	10.3.233.43
45	10.3.233.44/32	10.3.233.44 – 10.3.233.44	10.3.233.44
46	10.3.233.45/32	10.3.233.45 – 10.3.233.45	10.3.233.45
47	10.3.233.46/32	10.3.233.46 – 10.3.233.46	10.3.233.46
48	10.3.233.47/32	10.3.233.47 – 10.3.233.47	10.3.233.47
49	10.3.233.48/32	10.3.233.48 – 10.3.233.48	10.3.233.48
50	10.3.233.49/32	10.3.233.49 – 10.3.233.49	10.3.233.49
51	10.3.233.50/32	10.3.233.50 – 10.3.233.50	10.3.233.50
52	10.3.233.51/32	10.3.233.51 – 10.3.233.51	10.3.233.51
53	10.3.233.52/32	10.3.233.52 – 10.3.233.52	10.3.233.52
54	10.3.233.53/32	10.3.233.53 – 10.3.233.53	10.3.233.53
55	10.3.233.54/32	10.3.233.54 – 10.3.233.54	10.3.233.54
56	10.3.233.55/32	10.3.233.55 – 10.3.233.55	10.3.233.55
57	10.3.233.56/32	10.3.233.56 – 10.3.233.56	10.3.233.56
58	10.3.233.57/32	10.3.233.57 – 10.3.233.57	10.3.233.57
59	10.3.233.58/32	10.3.233.58 – 10.3.233.58	10.3.233.58
60	10.3.233.59/32	10.3.233.59 – 10.3.233.59	10.3.233.59
61	10.3.233.60/32	10.3.233.60 – 10.3.233.60	10.3.233.60
62	10.3.233.61/32	10.3.233.61 – 10.3.233.61	10.3.233.61
63	10.3.233.62/32	10.3.233.62 – 10.3.233.62	10.3.233.62
64	10.3.233.63/32	10.3.233.63 – 10.3.233.63	10.3.233.63
65	10.3.233.64/32	10.3.233.64 – 10.3.233.64	10.3.233.64
66	10.3.233.65/32	10.3.233.65 – 10.3.233.65	10.3.233.65
67	10.3.233.66/32	10.3.233.66 – 10.3.233.66	10.3.233.66
68	10.3.233.67/32	10.3.233.67 – 10.3.233.67	10.3.233.67
69	10.3.233.68/32	10.3.233.68 – 10.3.233.68	10.3.233.68
70	10.3.233.69/32	10.3.233.69 – 10.3.233.69	10.3.233.69
71	10.3.233.70/32	10.3.233.70 – 10.3.233.70	10.3.233.70
72	10.3.233.71/32	10.3.233.71 – 10.3.233.71	10.3.233.71
73	10.3.233.72/32	10.3.233.72 – 10.3.233.72	10.3.233.72
74	10.3.233.73/32	10.3.233.73 – 10.3.233.73	10.3.233.73
75	10.3.233.74/32	10.3.233.74 – 10.3.233.74	10.3.233.74
76	10.3.233.75/32	10.3.233.75 – 10.3.233.75	10.3.233.75
77	10.3.233.76/32	10.3.233.76 – 10.3.233.76	10.3.233.76
78	10.3.233.77/32	10.3.233.77 – 10.3.233.77	10.3.233.77
79	10.3.233.78/32	10.3.233.78 – 10.3.233.78	10.3.233.78
80	10.3.233.79/32	10.3.233.79 – 10.3.233.79	10.3.233.79
81	10.3.233.80/32	10.3.233.80 – 10.3.233.80	10.3.233.80
82	10.3.233.81/32	10.3.233.81 – 10.3.233.81	10.3.233.81
83	10.3.233.82/32	10.3.233.82 – 10.3.233.82	10.3.233.82
84	10.3.233.83/32	10.3.233.83 – 10.3.233.83	10.3.233.83
85	10.3.233.84/32	10.3.233.84 – 10.3.233.84	10.3.233.84
86	10.3.233.85/32	10.3.233.85 – 10.3.233.85	10.3.233.85
87	10.3.233.86/32	10.3.233.86 – 10.3.233.86	10.3.233.86
88	10.3.233.87/32	10.3.233.87 – 10.3.233.87	10.3.233.87
89	10.3.233.88/32	10.3.233.88 – 10.3.233.88	10.3.233.88
90	10.3.233.89/32	10.3.233.89 – 10.3.233.89	10.3.233.89
91	10.3.233.90/32	10.3.233.90 – 10.3.233.90	10.3.233.90
92	10.3.233.91/32	10.3.233.91 – 10.3.233.91	10.3.233.91
93	10.3.233.92/32	10.3.233.92 – 10.3.233.92	10.3.233.92
94	10.3.233.93/32	10.3.233.93 – 10.3.233.93	10.3.233.93
95	10.3.233.94/32	10.3.233.94 – 10.3.233.94	10.3.233.94
96	10.3.233.95/32	10.3.233.95 – 10.3.233.95	10.3.233.95
97	10.3.233.96/32	10.3.233.96 – 10.3.233.96	10.3.233.96
98	10.3.233.97/32	10.3.233.97 – 10.3.233.97	10.3.233.97
99	10.3.233.98/32	10.3.233.98 – 10.3.233.98	10.3.233.98
100	10.3.233.99/32	10.3.233.99 – 10.3.233.99	10.3.233.99
101	10.3.233.100/32	10.3.233.100 – 10.3.233.100	10.3.233.100
102	10.3.233.101/32	10.3.233.101 – 10.3.233.101	10.3.233.101
103	10.3.233.102/32	10.3.233.102 – 10.3.233.102	10.3.233.102
104	10.3.233.103/32	10.3.233.103 – 10.3.233.103	10.3.233.103
105	10.3.233.104/32	10.3.233.104 – 10.3.233.104	10.3.233.104
106	10.3.233.105/32	10.3.233.105 – 10.3.233.105	10.3.233.105
107	10.3.233.106/32	10.3.233.106 – 10.3.233.106	10.3.233.106
108	10.3.233.107/32	10.3.233.107 – 10.3.233.107	10.3.233.107
109	10.3.233.108/32	10.3.233.108 – 10.3.233.108	10.3.233.108
110	10.3.233.109/32	10.3.233.109 – 10.3.233.109	10.3.233.109
111	10.3.233.110/32	10.3.233.110 – 10.3.233.110	10.3.233.110
112	10.3.233.111/32	10.3.233.111 – 10.3.233.111	10.3.233.111
113	10.3.233.112/32	10.3.233.112 – 10.3.233.112	10.3.233.112
114	10.3.233.113/32	10.3.233.113 – 10.3.233.113	10.3.233.113
115	10.3.233.114/32	10.3.233.114 – 10.3.233.114	10.3.233.114
116	10.3.233.115/32	10.3.233.115 – 10.3.233.115	10.3.233.115
117	10.3.233.116/32	10.3.233.116 – 10.3.233.116	10.3.233.116
118	10.3.233.117/32	10.3.233.117 – 10.3.233.117	10.3.233.117
119	10.3.233.118/32	10.3.233.118 – 10.3.233.118	10.3.233.118
120	10.3.233.119/32	10.3.233.119 – 10.3.233.119	10.3.233.119
121	10.3.233.120/32	10.3.233.120 – 10.3.233.120	10.3.233.120
122	10.3.233.121/32	10.3.233.121 – 10.3.233.121	10.3.233.121
123	10.3.233.122/32	10.3.233.122 – 10.3.233.122	10.3.233.122
124	10.3.233.123/32	10.3.233.123 – 10.3.233.123	10.3.233.123
125	10.3.233.124/32	10.3.233.124 – 10.3.233.124	10.3.233.124
126	10.3.233.125/32	10.3.233.125 – 10.3.233.125	10.3.233.125
127	10.3.233.126/32	10.3.233.126 – 10.3.233.126	10.3.233.126
128	10.3.233.127/32	10.3.233.127 – 10.3.233.127	10.3.233.127

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 →