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)10.2.216.0/25

network10.2.216.0/25

broadcast10.2.216.127

first host10.2.216.1

last host10.2.216.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.216.0/25

address00001010.00000010.11011000.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.11011000.00000000

broadcast00001010.00000010.11011000.01111111

green = network part, grey = host part

hex0x0a02d800

decimal167958528

reverse dns0.216.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:d800

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.216.0/32	10.2.216.0 – 10.2.216.0	10.2.216.0
2	10.2.216.1/32	10.2.216.1 – 10.2.216.1	10.2.216.1
3	10.2.216.2/32	10.2.216.2 – 10.2.216.2	10.2.216.2
4	10.2.216.3/32	10.2.216.3 – 10.2.216.3	10.2.216.3
5	10.2.216.4/32	10.2.216.4 – 10.2.216.4	10.2.216.4
6	10.2.216.5/32	10.2.216.5 – 10.2.216.5	10.2.216.5
7	10.2.216.6/32	10.2.216.6 – 10.2.216.6	10.2.216.6
8	10.2.216.7/32	10.2.216.7 – 10.2.216.7	10.2.216.7
9	10.2.216.8/32	10.2.216.8 – 10.2.216.8	10.2.216.8
10	10.2.216.9/32	10.2.216.9 – 10.2.216.9	10.2.216.9
11	10.2.216.10/32	10.2.216.10 – 10.2.216.10	10.2.216.10
12	10.2.216.11/32	10.2.216.11 – 10.2.216.11	10.2.216.11
13	10.2.216.12/32	10.2.216.12 – 10.2.216.12	10.2.216.12
14	10.2.216.13/32	10.2.216.13 – 10.2.216.13	10.2.216.13
15	10.2.216.14/32	10.2.216.14 – 10.2.216.14	10.2.216.14
16	10.2.216.15/32	10.2.216.15 – 10.2.216.15	10.2.216.15
17	10.2.216.16/32	10.2.216.16 – 10.2.216.16	10.2.216.16
18	10.2.216.17/32	10.2.216.17 – 10.2.216.17	10.2.216.17
19	10.2.216.18/32	10.2.216.18 – 10.2.216.18	10.2.216.18
20	10.2.216.19/32	10.2.216.19 – 10.2.216.19	10.2.216.19
21	10.2.216.20/32	10.2.216.20 – 10.2.216.20	10.2.216.20
22	10.2.216.21/32	10.2.216.21 – 10.2.216.21	10.2.216.21
23	10.2.216.22/32	10.2.216.22 – 10.2.216.22	10.2.216.22
24	10.2.216.23/32	10.2.216.23 – 10.2.216.23	10.2.216.23
25	10.2.216.24/32	10.2.216.24 – 10.2.216.24	10.2.216.24
26	10.2.216.25/32	10.2.216.25 – 10.2.216.25	10.2.216.25
27	10.2.216.26/32	10.2.216.26 – 10.2.216.26	10.2.216.26
28	10.2.216.27/32	10.2.216.27 – 10.2.216.27	10.2.216.27
29	10.2.216.28/32	10.2.216.28 – 10.2.216.28	10.2.216.28
30	10.2.216.29/32	10.2.216.29 – 10.2.216.29	10.2.216.29
31	10.2.216.30/32	10.2.216.30 – 10.2.216.30	10.2.216.30
32	10.2.216.31/32	10.2.216.31 – 10.2.216.31	10.2.216.31
33	10.2.216.32/32	10.2.216.32 – 10.2.216.32	10.2.216.32
34	10.2.216.33/32	10.2.216.33 – 10.2.216.33	10.2.216.33
35	10.2.216.34/32	10.2.216.34 – 10.2.216.34	10.2.216.34
36	10.2.216.35/32	10.2.216.35 – 10.2.216.35	10.2.216.35
37	10.2.216.36/32	10.2.216.36 – 10.2.216.36	10.2.216.36
38	10.2.216.37/32	10.2.216.37 – 10.2.216.37	10.2.216.37
39	10.2.216.38/32	10.2.216.38 – 10.2.216.38	10.2.216.38
40	10.2.216.39/32	10.2.216.39 – 10.2.216.39	10.2.216.39
41	10.2.216.40/32	10.2.216.40 – 10.2.216.40	10.2.216.40
42	10.2.216.41/32	10.2.216.41 – 10.2.216.41	10.2.216.41
43	10.2.216.42/32	10.2.216.42 – 10.2.216.42	10.2.216.42
44	10.2.216.43/32	10.2.216.43 – 10.2.216.43	10.2.216.43
45	10.2.216.44/32	10.2.216.44 – 10.2.216.44	10.2.216.44
46	10.2.216.45/32	10.2.216.45 – 10.2.216.45	10.2.216.45
47	10.2.216.46/32	10.2.216.46 – 10.2.216.46	10.2.216.46
48	10.2.216.47/32	10.2.216.47 – 10.2.216.47	10.2.216.47
49	10.2.216.48/32	10.2.216.48 – 10.2.216.48	10.2.216.48
50	10.2.216.49/32	10.2.216.49 – 10.2.216.49	10.2.216.49
51	10.2.216.50/32	10.2.216.50 – 10.2.216.50	10.2.216.50
52	10.2.216.51/32	10.2.216.51 – 10.2.216.51	10.2.216.51
53	10.2.216.52/32	10.2.216.52 – 10.2.216.52	10.2.216.52
54	10.2.216.53/32	10.2.216.53 – 10.2.216.53	10.2.216.53
55	10.2.216.54/32	10.2.216.54 – 10.2.216.54	10.2.216.54
56	10.2.216.55/32	10.2.216.55 – 10.2.216.55	10.2.216.55
57	10.2.216.56/32	10.2.216.56 – 10.2.216.56	10.2.216.56
58	10.2.216.57/32	10.2.216.57 – 10.2.216.57	10.2.216.57
59	10.2.216.58/32	10.2.216.58 – 10.2.216.58	10.2.216.58
60	10.2.216.59/32	10.2.216.59 – 10.2.216.59	10.2.216.59
61	10.2.216.60/32	10.2.216.60 – 10.2.216.60	10.2.216.60
62	10.2.216.61/32	10.2.216.61 – 10.2.216.61	10.2.216.61
63	10.2.216.62/32	10.2.216.62 – 10.2.216.62	10.2.216.62
64	10.2.216.63/32	10.2.216.63 – 10.2.216.63	10.2.216.63
65	10.2.216.64/32	10.2.216.64 – 10.2.216.64	10.2.216.64
66	10.2.216.65/32	10.2.216.65 – 10.2.216.65	10.2.216.65
67	10.2.216.66/32	10.2.216.66 – 10.2.216.66	10.2.216.66
68	10.2.216.67/32	10.2.216.67 – 10.2.216.67	10.2.216.67
69	10.2.216.68/32	10.2.216.68 – 10.2.216.68	10.2.216.68
70	10.2.216.69/32	10.2.216.69 – 10.2.216.69	10.2.216.69
71	10.2.216.70/32	10.2.216.70 – 10.2.216.70	10.2.216.70
72	10.2.216.71/32	10.2.216.71 – 10.2.216.71	10.2.216.71
73	10.2.216.72/32	10.2.216.72 – 10.2.216.72	10.2.216.72
74	10.2.216.73/32	10.2.216.73 – 10.2.216.73	10.2.216.73
75	10.2.216.74/32	10.2.216.74 – 10.2.216.74	10.2.216.74
76	10.2.216.75/32	10.2.216.75 – 10.2.216.75	10.2.216.75
77	10.2.216.76/32	10.2.216.76 – 10.2.216.76	10.2.216.76
78	10.2.216.77/32	10.2.216.77 – 10.2.216.77	10.2.216.77
79	10.2.216.78/32	10.2.216.78 – 10.2.216.78	10.2.216.78
80	10.2.216.79/32	10.2.216.79 – 10.2.216.79	10.2.216.79
81	10.2.216.80/32	10.2.216.80 – 10.2.216.80	10.2.216.80
82	10.2.216.81/32	10.2.216.81 – 10.2.216.81	10.2.216.81
83	10.2.216.82/32	10.2.216.82 – 10.2.216.82	10.2.216.82
84	10.2.216.83/32	10.2.216.83 – 10.2.216.83	10.2.216.83
85	10.2.216.84/32	10.2.216.84 – 10.2.216.84	10.2.216.84
86	10.2.216.85/32	10.2.216.85 – 10.2.216.85	10.2.216.85
87	10.2.216.86/32	10.2.216.86 – 10.2.216.86	10.2.216.86
88	10.2.216.87/32	10.2.216.87 – 10.2.216.87	10.2.216.87
89	10.2.216.88/32	10.2.216.88 – 10.2.216.88	10.2.216.88
90	10.2.216.89/32	10.2.216.89 – 10.2.216.89	10.2.216.89
91	10.2.216.90/32	10.2.216.90 – 10.2.216.90	10.2.216.90
92	10.2.216.91/32	10.2.216.91 – 10.2.216.91	10.2.216.91
93	10.2.216.92/32	10.2.216.92 – 10.2.216.92	10.2.216.92
94	10.2.216.93/32	10.2.216.93 – 10.2.216.93	10.2.216.93
95	10.2.216.94/32	10.2.216.94 – 10.2.216.94	10.2.216.94
96	10.2.216.95/32	10.2.216.95 – 10.2.216.95	10.2.216.95
97	10.2.216.96/32	10.2.216.96 – 10.2.216.96	10.2.216.96
98	10.2.216.97/32	10.2.216.97 – 10.2.216.97	10.2.216.97
99	10.2.216.98/32	10.2.216.98 – 10.2.216.98	10.2.216.98
100	10.2.216.99/32	10.2.216.99 – 10.2.216.99	10.2.216.99
101	10.2.216.100/32	10.2.216.100 – 10.2.216.100	10.2.216.100
102	10.2.216.101/32	10.2.216.101 – 10.2.216.101	10.2.216.101
103	10.2.216.102/32	10.2.216.102 – 10.2.216.102	10.2.216.102
104	10.2.216.103/32	10.2.216.103 – 10.2.216.103	10.2.216.103
105	10.2.216.104/32	10.2.216.104 – 10.2.216.104	10.2.216.104
106	10.2.216.105/32	10.2.216.105 – 10.2.216.105	10.2.216.105
107	10.2.216.106/32	10.2.216.106 – 10.2.216.106	10.2.216.106
108	10.2.216.107/32	10.2.216.107 – 10.2.216.107	10.2.216.107
109	10.2.216.108/32	10.2.216.108 – 10.2.216.108	10.2.216.108
110	10.2.216.109/32	10.2.216.109 – 10.2.216.109	10.2.216.109
111	10.2.216.110/32	10.2.216.110 – 10.2.216.110	10.2.216.110
112	10.2.216.111/32	10.2.216.111 – 10.2.216.111	10.2.216.111
113	10.2.216.112/32	10.2.216.112 – 10.2.216.112	10.2.216.112
114	10.2.216.113/32	10.2.216.113 – 10.2.216.113	10.2.216.113
115	10.2.216.114/32	10.2.216.114 – 10.2.216.114	10.2.216.114
116	10.2.216.115/32	10.2.216.115 – 10.2.216.115	10.2.216.115
117	10.2.216.116/32	10.2.216.116 – 10.2.216.116	10.2.216.116
118	10.2.216.117/32	10.2.216.117 – 10.2.216.117	10.2.216.117
119	10.2.216.118/32	10.2.216.118 – 10.2.216.118	10.2.216.118
120	10.2.216.119/32	10.2.216.119 – 10.2.216.119	10.2.216.119
121	10.2.216.120/32	10.2.216.120 – 10.2.216.120	10.2.216.120
122	10.2.216.121/32	10.2.216.121 – 10.2.216.121	10.2.216.121
123	10.2.216.122/32	10.2.216.122 – 10.2.216.122	10.2.216.122
124	10.2.216.123/32	10.2.216.123 – 10.2.216.123	10.2.216.123
125	10.2.216.124/32	10.2.216.124 – 10.2.216.124	10.2.216.124
126	10.2.216.125/32	10.2.216.125 – 10.2.216.125	10.2.216.125
127	10.2.216.126/32	10.2.216.126 – 10.2.216.126	10.2.216.126
128	10.2.216.127/32	10.2.216.127 – 10.2.216.127	10.2.216.127

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 →