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)10.2.186.0/25

network10.2.186.0/25

broadcast10.2.186.127

first host10.2.186.1

last host10.2.186.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.186.0/25

address00001010.00000010.10111010.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.10111010.00000000

broadcast00001010.00000010.10111010.01111111

green = network part, grey = host part

hex0x0a02ba00

decimal167950848

reverse dns0.186.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:ba00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.186.0/32	10.2.186.0 – 10.2.186.0	10.2.186.0
2	10.2.186.1/32	10.2.186.1 – 10.2.186.1	10.2.186.1
3	10.2.186.2/32	10.2.186.2 – 10.2.186.2	10.2.186.2
4	10.2.186.3/32	10.2.186.3 – 10.2.186.3	10.2.186.3
5	10.2.186.4/32	10.2.186.4 – 10.2.186.4	10.2.186.4
6	10.2.186.5/32	10.2.186.5 – 10.2.186.5	10.2.186.5
7	10.2.186.6/32	10.2.186.6 – 10.2.186.6	10.2.186.6
8	10.2.186.7/32	10.2.186.7 – 10.2.186.7	10.2.186.7
9	10.2.186.8/32	10.2.186.8 – 10.2.186.8	10.2.186.8
10	10.2.186.9/32	10.2.186.9 – 10.2.186.9	10.2.186.9
11	10.2.186.10/32	10.2.186.10 – 10.2.186.10	10.2.186.10
12	10.2.186.11/32	10.2.186.11 – 10.2.186.11	10.2.186.11
13	10.2.186.12/32	10.2.186.12 – 10.2.186.12	10.2.186.12
14	10.2.186.13/32	10.2.186.13 – 10.2.186.13	10.2.186.13
15	10.2.186.14/32	10.2.186.14 – 10.2.186.14	10.2.186.14
16	10.2.186.15/32	10.2.186.15 – 10.2.186.15	10.2.186.15
17	10.2.186.16/32	10.2.186.16 – 10.2.186.16	10.2.186.16
18	10.2.186.17/32	10.2.186.17 – 10.2.186.17	10.2.186.17
19	10.2.186.18/32	10.2.186.18 – 10.2.186.18	10.2.186.18
20	10.2.186.19/32	10.2.186.19 – 10.2.186.19	10.2.186.19
21	10.2.186.20/32	10.2.186.20 – 10.2.186.20	10.2.186.20
22	10.2.186.21/32	10.2.186.21 – 10.2.186.21	10.2.186.21
23	10.2.186.22/32	10.2.186.22 – 10.2.186.22	10.2.186.22
24	10.2.186.23/32	10.2.186.23 – 10.2.186.23	10.2.186.23
25	10.2.186.24/32	10.2.186.24 – 10.2.186.24	10.2.186.24
26	10.2.186.25/32	10.2.186.25 – 10.2.186.25	10.2.186.25
27	10.2.186.26/32	10.2.186.26 – 10.2.186.26	10.2.186.26
28	10.2.186.27/32	10.2.186.27 – 10.2.186.27	10.2.186.27
29	10.2.186.28/32	10.2.186.28 – 10.2.186.28	10.2.186.28
30	10.2.186.29/32	10.2.186.29 – 10.2.186.29	10.2.186.29
31	10.2.186.30/32	10.2.186.30 – 10.2.186.30	10.2.186.30
32	10.2.186.31/32	10.2.186.31 – 10.2.186.31	10.2.186.31
33	10.2.186.32/32	10.2.186.32 – 10.2.186.32	10.2.186.32
34	10.2.186.33/32	10.2.186.33 – 10.2.186.33	10.2.186.33
35	10.2.186.34/32	10.2.186.34 – 10.2.186.34	10.2.186.34
36	10.2.186.35/32	10.2.186.35 – 10.2.186.35	10.2.186.35
37	10.2.186.36/32	10.2.186.36 – 10.2.186.36	10.2.186.36
38	10.2.186.37/32	10.2.186.37 – 10.2.186.37	10.2.186.37
39	10.2.186.38/32	10.2.186.38 – 10.2.186.38	10.2.186.38
40	10.2.186.39/32	10.2.186.39 – 10.2.186.39	10.2.186.39
41	10.2.186.40/32	10.2.186.40 – 10.2.186.40	10.2.186.40
42	10.2.186.41/32	10.2.186.41 – 10.2.186.41	10.2.186.41
43	10.2.186.42/32	10.2.186.42 – 10.2.186.42	10.2.186.42
44	10.2.186.43/32	10.2.186.43 – 10.2.186.43	10.2.186.43
45	10.2.186.44/32	10.2.186.44 – 10.2.186.44	10.2.186.44
46	10.2.186.45/32	10.2.186.45 – 10.2.186.45	10.2.186.45
47	10.2.186.46/32	10.2.186.46 – 10.2.186.46	10.2.186.46
48	10.2.186.47/32	10.2.186.47 – 10.2.186.47	10.2.186.47
49	10.2.186.48/32	10.2.186.48 – 10.2.186.48	10.2.186.48
50	10.2.186.49/32	10.2.186.49 – 10.2.186.49	10.2.186.49
51	10.2.186.50/32	10.2.186.50 – 10.2.186.50	10.2.186.50
52	10.2.186.51/32	10.2.186.51 – 10.2.186.51	10.2.186.51
53	10.2.186.52/32	10.2.186.52 – 10.2.186.52	10.2.186.52
54	10.2.186.53/32	10.2.186.53 – 10.2.186.53	10.2.186.53
55	10.2.186.54/32	10.2.186.54 – 10.2.186.54	10.2.186.54
56	10.2.186.55/32	10.2.186.55 – 10.2.186.55	10.2.186.55
57	10.2.186.56/32	10.2.186.56 – 10.2.186.56	10.2.186.56
58	10.2.186.57/32	10.2.186.57 – 10.2.186.57	10.2.186.57
59	10.2.186.58/32	10.2.186.58 – 10.2.186.58	10.2.186.58
60	10.2.186.59/32	10.2.186.59 – 10.2.186.59	10.2.186.59
61	10.2.186.60/32	10.2.186.60 – 10.2.186.60	10.2.186.60
62	10.2.186.61/32	10.2.186.61 – 10.2.186.61	10.2.186.61
63	10.2.186.62/32	10.2.186.62 – 10.2.186.62	10.2.186.62
64	10.2.186.63/32	10.2.186.63 – 10.2.186.63	10.2.186.63
65	10.2.186.64/32	10.2.186.64 – 10.2.186.64	10.2.186.64
66	10.2.186.65/32	10.2.186.65 – 10.2.186.65	10.2.186.65
67	10.2.186.66/32	10.2.186.66 – 10.2.186.66	10.2.186.66
68	10.2.186.67/32	10.2.186.67 – 10.2.186.67	10.2.186.67
69	10.2.186.68/32	10.2.186.68 – 10.2.186.68	10.2.186.68
70	10.2.186.69/32	10.2.186.69 – 10.2.186.69	10.2.186.69
71	10.2.186.70/32	10.2.186.70 – 10.2.186.70	10.2.186.70
72	10.2.186.71/32	10.2.186.71 – 10.2.186.71	10.2.186.71
73	10.2.186.72/32	10.2.186.72 – 10.2.186.72	10.2.186.72
74	10.2.186.73/32	10.2.186.73 – 10.2.186.73	10.2.186.73
75	10.2.186.74/32	10.2.186.74 – 10.2.186.74	10.2.186.74
76	10.2.186.75/32	10.2.186.75 – 10.2.186.75	10.2.186.75
77	10.2.186.76/32	10.2.186.76 – 10.2.186.76	10.2.186.76
78	10.2.186.77/32	10.2.186.77 – 10.2.186.77	10.2.186.77
79	10.2.186.78/32	10.2.186.78 – 10.2.186.78	10.2.186.78
80	10.2.186.79/32	10.2.186.79 – 10.2.186.79	10.2.186.79
81	10.2.186.80/32	10.2.186.80 – 10.2.186.80	10.2.186.80
82	10.2.186.81/32	10.2.186.81 – 10.2.186.81	10.2.186.81
83	10.2.186.82/32	10.2.186.82 – 10.2.186.82	10.2.186.82
84	10.2.186.83/32	10.2.186.83 – 10.2.186.83	10.2.186.83
85	10.2.186.84/32	10.2.186.84 – 10.2.186.84	10.2.186.84
86	10.2.186.85/32	10.2.186.85 – 10.2.186.85	10.2.186.85
87	10.2.186.86/32	10.2.186.86 – 10.2.186.86	10.2.186.86
88	10.2.186.87/32	10.2.186.87 – 10.2.186.87	10.2.186.87
89	10.2.186.88/32	10.2.186.88 – 10.2.186.88	10.2.186.88
90	10.2.186.89/32	10.2.186.89 – 10.2.186.89	10.2.186.89
91	10.2.186.90/32	10.2.186.90 – 10.2.186.90	10.2.186.90
92	10.2.186.91/32	10.2.186.91 – 10.2.186.91	10.2.186.91
93	10.2.186.92/32	10.2.186.92 – 10.2.186.92	10.2.186.92
94	10.2.186.93/32	10.2.186.93 – 10.2.186.93	10.2.186.93
95	10.2.186.94/32	10.2.186.94 – 10.2.186.94	10.2.186.94
96	10.2.186.95/32	10.2.186.95 – 10.2.186.95	10.2.186.95
97	10.2.186.96/32	10.2.186.96 – 10.2.186.96	10.2.186.96
98	10.2.186.97/32	10.2.186.97 – 10.2.186.97	10.2.186.97
99	10.2.186.98/32	10.2.186.98 – 10.2.186.98	10.2.186.98
100	10.2.186.99/32	10.2.186.99 – 10.2.186.99	10.2.186.99
101	10.2.186.100/32	10.2.186.100 – 10.2.186.100	10.2.186.100
102	10.2.186.101/32	10.2.186.101 – 10.2.186.101	10.2.186.101
103	10.2.186.102/32	10.2.186.102 – 10.2.186.102	10.2.186.102
104	10.2.186.103/32	10.2.186.103 – 10.2.186.103	10.2.186.103
105	10.2.186.104/32	10.2.186.104 – 10.2.186.104	10.2.186.104
106	10.2.186.105/32	10.2.186.105 – 10.2.186.105	10.2.186.105
107	10.2.186.106/32	10.2.186.106 – 10.2.186.106	10.2.186.106
108	10.2.186.107/32	10.2.186.107 – 10.2.186.107	10.2.186.107
109	10.2.186.108/32	10.2.186.108 – 10.2.186.108	10.2.186.108
110	10.2.186.109/32	10.2.186.109 – 10.2.186.109	10.2.186.109
111	10.2.186.110/32	10.2.186.110 – 10.2.186.110	10.2.186.110
112	10.2.186.111/32	10.2.186.111 – 10.2.186.111	10.2.186.111
113	10.2.186.112/32	10.2.186.112 – 10.2.186.112	10.2.186.112
114	10.2.186.113/32	10.2.186.113 – 10.2.186.113	10.2.186.113
115	10.2.186.114/32	10.2.186.114 – 10.2.186.114	10.2.186.114
116	10.2.186.115/32	10.2.186.115 – 10.2.186.115	10.2.186.115
117	10.2.186.116/32	10.2.186.116 – 10.2.186.116	10.2.186.116
118	10.2.186.117/32	10.2.186.117 – 10.2.186.117	10.2.186.117
119	10.2.186.118/32	10.2.186.118 – 10.2.186.118	10.2.186.118
120	10.2.186.119/32	10.2.186.119 – 10.2.186.119	10.2.186.119
121	10.2.186.120/32	10.2.186.120 – 10.2.186.120	10.2.186.120
122	10.2.186.121/32	10.2.186.121 – 10.2.186.121	10.2.186.121
123	10.2.186.122/32	10.2.186.122 – 10.2.186.122	10.2.186.122
124	10.2.186.123/32	10.2.186.123 – 10.2.186.123	10.2.186.123
125	10.2.186.124/32	10.2.186.124 – 10.2.186.124	10.2.186.124
126	10.2.186.125/32	10.2.186.125 – 10.2.186.125	10.2.186.125
127	10.2.186.126/32	10.2.186.126 – 10.2.186.126	10.2.186.126
128	10.2.186.127/32	10.2.186.127 – 10.2.186.127	10.2.186.127

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 →