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)10.2.188.0/25

network10.2.188.0/25

broadcast10.2.188.127

first host10.2.188.1

last host10.2.188.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.188.0/25

address00001010.00000010.10111100.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.10111100.00000000

broadcast00001010.00000010.10111100.01111111

green = network part, grey = host part

hex0x0a02bc00

decimal167951360

reverse dns0.188.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:bc00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.188.0/32	10.2.188.0 – 10.2.188.0	10.2.188.0
2	10.2.188.1/32	10.2.188.1 – 10.2.188.1	10.2.188.1
3	10.2.188.2/32	10.2.188.2 – 10.2.188.2	10.2.188.2
4	10.2.188.3/32	10.2.188.3 – 10.2.188.3	10.2.188.3
5	10.2.188.4/32	10.2.188.4 – 10.2.188.4	10.2.188.4
6	10.2.188.5/32	10.2.188.5 – 10.2.188.5	10.2.188.5
7	10.2.188.6/32	10.2.188.6 – 10.2.188.6	10.2.188.6
8	10.2.188.7/32	10.2.188.7 – 10.2.188.7	10.2.188.7
9	10.2.188.8/32	10.2.188.8 – 10.2.188.8	10.2.188.8
10	10.2.188.9/32	10.2.188.9 – 10.2.188.9	10.2.188.9
11	10.2.188.10/32	10.2.188.10 – 10.2.188.10	10.2.188.10
12	10.2.188.11/32	10.2.188.11 – 10.2.188.11	10.2.188.11
13	10.2.188.12/32	10.2.188.12 – 10.2.188.12	10.2.188.12
14	10.2.188.13/32	10.2.188.13 – 10.2.188.13	10.2.188.13
15	10.2.188.14/32	10.2.188.14 – 10.2.188.14	10.2.188.14
16	10.2.188.15/32	10.2.188.15 – 10.2.188.15	10.2.188.15
17	10.2.188.16/32	10.2.188.16 – 10.2.188.16	10.2.188.16
18	10.2.188.17/32	10.2.188.17 – 10.2.188.17	10.2.188.17
19	10.2.188.18/32	10.2.188.18 – 10.2.188.18	10.2.188.18
20	10.2.188.19/32	10.2.188.19 – 10.2.188.19	10.2.188.19
21	10.2.188.20/32	10.2.188.20 – 10.2.188.20	10.2.188.20
22	10.2.188.21/32	10.2.188.21 – 10.2.188.21	10.2.188.21
23	10.2.188.22/32	10.2.188.22 – 10.2.188.22	10.2.188.22
24	10.2.188.23/32	10.2.188.23 – 10.2.188.23	10.2.188.23
25	10.2.188.24/32	10.2.188.24 – 10.2.188.24	10.2.188.24
26	10.2.188.25/32	10.2.188.25 – 10.2.188.25	10.2.188.25
27	10.2.188.26/32	10.2.188.26 – 10.2.188.26	10.2.188.26
28	10.2.188.27/32	10.2.188.27 – 10.2.188.27	10.2.188.27
29	10.2.188.28/32	10.2.188.28 – 10.2.188.28	10.2.188.28
30	10.2.188.29/32	10.2.188.29 – 10.2.188.29	10.2.188.29
31	10.2.188.30/32	10.2.188.30 – 10.2.188.30	10.2.188.30
32	10.2.188.31/32	10.2.188.31 – 10.2.188.31	10.2.188.31
33	10.2.188.32/32	10.2.188.32 – 10.2.188.32	10.2.188.32
34	10.2.188.33/32	10.2.188.33 – 10.2.188.33	10.2.188.33
35	10.2.188.34/32	10.2.188.34 – 10.2.188.34	10.2.188.34
36	10.2.188.35/32	10.2.188.35 – 10.2.188.35	10.2.188.35
37	10.2.188.36/32	10.2.188.36 – 10.2.188.36	10.2.188.36
38	10.2.188.37/32	10.2.188.37 – 10.2.188.37	10.2.188.37
39	10.2.188.38/32	10.2.188.38 – 10.2.188.38	10.2.188.38
40	10.2.188.39/32	10.2.188.39 – 10.2.188.39	10.2.188.39
41	10.2.188.40/32	10.2.188.40 – 10.2.188.40	10.2.188.40
42	10.2.188.41/32	10.2.188.41 – 10.2.188.41	10.2.188.41
43	10.2.188.42/32	10.2.188.42 – 10.2.188.42	10.2.188.42
44	10.2.188.43/32	10.2.188.43 – 10.2.188.43	10.2.188.43
45	10.2.188.44/32	10.2.188.44 – 10.2.188.44	10.2.188.44
46	10.2.188.45/32	10.2.188.45 – 10.2.188.45	10.2.188.45
47	10.2.188.46/32	10.2.188.46 – 10.2.188.46	10.2.188.46
48	10.2.188.47/32	10.2.188.47 – 10.2.188.47	10.2.188.47
49	10.2.188.48/32	10.2.188.48 – 10.2.188.48	10.2.188.48
50	10.2.188.49/32	10.2.188.49 – 10.2.188.49	10.2.188.49
51	10.2.188.50/32	10.2.188.50 – 10.2.188.50	10.2.188.50
52	10.2.188.51/32	10.2.188.51 – 10.2.188.51	10.2.188.51
53	10.2.188.52/32	10.2.188.52 – 10.2.188.52	10.2.188.52
54	10.2.188.53/32	10.2.188.53 – 10.2.188.53	10.2.188.53
55	10.2.188.54/32	10.2.188.54 – 10.2.188.54	10.2.188.54
56	10.2.188.55/32	10.2.188.55 – 10.2.188.55	10.2.188.55
57	10.2.188.56/32	10.2.188.56 – 10.2.188.56	10.2.188.56
58	10.2.188.57/32	10.2.188.57 – 10.2.188.57	10.2.188.57
59	10.2.188.58/32	10.2.188.58 – 10.2.188.58	10.2.188.58
60	10.2.188.59/32	10.2.188.59 – 10.2.188.59	10.2.188.59
61	10.2.188.60/32	10.2.188.60 – 10.2.188.60	10.2.188.60
62	10.2.188.61/32	10.2.188.61 – 10.2.188.61	10.2.188.61
63	10.2.188.62/32	10.2.188.62 – 10.2.188.62	10.2.188.62
64	10.2.188.63/32	10.2.188.63 – 10.2.188.63	10.2.188.63
65	10.2.188.64/32	10.2.188.64 – 10.2.188.64	10.2.188.64
66	10.2.188.65/32	10.2.188.65 – 10.2.188.65	10.2.188.65
67	10.2.188.66/32	10.2.188.66 – 10.2.188.66	10.2.188.66
68	10.2.188.67/32	10.2.188.67 – 10.2.188.67	10.2.188.67
69	10.2.188.68/32	10.2.188.68 – 10.2.188.68	10.2.188.68
70	10.2.188.69/32	10.2.188.69 – 10.2.188.69	10.2.188.69
71	10.2.188.70/32	10.2.188.70 – 10.2.188.70	10.2.188.70
72	10.2.188.71/32	10.2.188.71 – 10.2.188.71	10.2.188.71
73	10.2.188.72/32	10.2.188.72 – 10.2.188.72	10.2.188.72
74	10.2.188.73/32	10.2.188.73 – 10.2.188.73	10.2.188.73
75	10.2.188.74/32	10.2.188.74 – 10.2.188.74	10.2.188.74
76	10.2.188.75/32	10.2.188.75 – 10.2.188.75	10.2.188.75
77	10.2.188.76/32	10.2.188.76 – 10.2.188.76	10.2.188.76
78	10.2.188.77/32	10.2.188.77 – 10.2.188.77	10.2.188.77
79	10.2.188.78/32	10.2.188.78 – 10.2.188.78	10.2.188.78
80	10.2.188.79/32	10.2.188.79 – 10.2.188.79	10.2.188.79
81	10.2.188.80/32	10.2.188.80 – 10.2.188.80	10.2.188.80
82	10.2.188.81/32	10.2.188.81 – 10.2.188.81	10.2.188.81
83	10.2.188.82/32	10.2.188.82 – 10.2.188.82	10.2.188.82
84	10.2.188.83/32	10.2.188.83 – 10.2.188.83	10.2.188.83
85	10.2.188.84/32	10.2.188.84 – 10.2.188.84	10.2.188.84
86	10.2.188.85/32	10.2.188.85 – 10.2.188.85	10.2.188.85
87	10.2.188.86/32	10.2.188.86 – 10.2.188.86	10.2.188.86
88	10.2.188.87/32	10.2.188.87 – 10.2.188.87	10.2.188.87
89	10.2.188.88/32	10.2.188.88 – 10.2.188.88	10.2.188.88
90	10.2.188.89/32	10.2.188.89 – 10.2.188.89	10.2.188.89
91	10.2.188.90/32	10.2.188.90 – 10.2.188.90	10.2.188.90
92	10.2.188.91/32	10.2.188.91 – 10.2.188.91	10.2.188.91
93	10.2.188.92/32	10.2.188.92 – 10.2.188.92	10.2.188.92
94	10.2.188.93/32	10.2.188.93 – 10.2.188.93	10.2.188.93
95	10.2.188.94/32	10.2.188.94 – 10.2.188.94	10.2.188.94
96	10.2.188.95/32	10.2.188.95 – 10.2.188.95	10.2.188.95
97	10.2.188.96/32	10.2.188.96 – 10.2.188.96	10.2.188.96
98	10.2.188.97/32	10.2.188.97 – 10.2.188.97	10.2.188.97
99	10.2.188.98/32	10.2.188.98 – 10.2.188.98	10.2.188.98
100	10.2.188.99/32	10.2.188.99 – 10.2.188.99	10.2.188.99
101	10.2.188.100/32	10.2.188.100 – 10.2.188.100	10.2.188.100
102	10.2.188.101/32	10.2.188.101 – 10.2.188.101	10.2.188.101
103	10.2.188.102/32	10.2.188.102 – 10.2.188.102	10.2.188.102
104	10.2.188.103/32	10.2.188.103 – 10.2.188.103	10.2.188.103
105	10.2.188.104/32	10.2.188.104 – 10.2.188.104	10.2.188.104
106	10.2.188.105/32	10.2.188.105 – 10.2.188.105	10.2.188.105
107	10.2.188.106/32	10.2.188.106 – 10.2.188.106	10.2.188.106
108	10.2.188.107/32	10.2.188.107 – 10.2.188.107	10.2.188.107
109	10.2.188.108/32	10.2.188.108 – 10.2.188.108	10.2.188.108
110	10.2.188.109/32	10.2.188.109 – 10.2.188.109	10.2.188.109
111	10.2.188.110/32	10.2.188.110 – 10.2.188.110	10.2.188.110
112	10.2.188.111/32	10.2.188.111 – 10.2.188.111	10.2.188.111
113	10.2.188.112/32	10.2.188.112 – 10.2.188.112	10.2.188.112
114	10.2.188.113/32	10.2.188.113 – 10.2.188.113	10.2.188.113
115	10.2.188.114/32	10.2.188.114 – 10.2.188.114	10.2.188.114
116	10.2.188.115/32	10.2.188.115 – 10.2.188.115	10.2.188.115
117	10.2.188.116/32	10.2.188.116 – 10.2.188.116	10.2.188.116
118	10.2.188.117/32	10.2.188.117 – 10.2.188.117	10.2.188.117
119	10.2.188.118/32	10.2.188.118 – 10.2.188.118	10.2.188.118
120	10.2.188.119/32	10.2.188.119 – 10.2.188.119	10.2.188.119
121	10.2.188.120/32	10.2.188.120 – 10.2.188.120	10.2.188.120
122	10.2.188.121/32	10.2.188.121 – 10.2.188.121	10.2.188.121
123	10.2.188.122/32	10.2.188.122 – 10.2.188.122	10.2.188.122
124	10.2.188.123/32	10.2.188.123 – 10.2.188.123	10.2.188.123
125	10.2.188.124/32	10.2.188.124 – 10.2.188.124	10.2.188.124
126	10.2.188.125/32	10.2.188.125 – 10.2.188.125	10.2.188.125
127	10.2.188.126/32	10.2.188.126 – 10.2.188.126	10.2.188.126
128	10.2.188.127/32	10.2.188.127 – 10.2.188.127	10.2.188.127

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 →