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)10.2.202.0/25

network10.2.202.0/25

broadcast10.2.202.127

first host10.2.202.1

last host10.2.202.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.202.0/25

address00001010.00000010.11001010.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.11001010.00000000

broadcast00001010.00000010.11001010.01111111

green = network part, grey = host part

hex0x0a02ca00

decimal167954944

reverse dns0.202.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:ca00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.202.0/32	10.2.202.0 – 10.2.202.0	10.2.202.0
2	10.2.202.1/32	10.2.202.1 – 10.2.202.1	10.2.202.1
3	10.2.202.2/32	10.2.202.2 – 10.2.202.2	10.2.202.2
4	10.2.202.3/32	10.2.202.3 – 10.2.202.3	10.2.202.3
5	10.2.202.4/32	10.2.202.4 – 10.2.202.4	10.2.202.4
6	10.2.202.5/32	10.2.202.5 – 10.2.202.5	10.2.202.5
7	10.2.202.6/32	10.2.202.6 – 10.2.202.6	10.2.202.6
8	10.2.202.7/32	10.2.202.7 – 10.2.202.7	10.2.202.7
9	10.2.202.8/32	10.2.202.8 – 10.2.202.8	10.2.202.8
10	10.2.202.9/32	10.2.202.9 – 10.2.202.9	10.2.202.9
11	10.2.202.10/32	10.2.202.10 – 10.2.202.10	10.2.202.10
12	10.2.202.11/32	10.2.202.11 – 10.2.202.11	10.2.202.11
13	10.2.202.12/32	10.2.202.12 – 10.2.202.12	10.2.202.12
14	10.2.202.13/32	10.2.202.13 – 10.2.202.13	10.2.202.13
15	10.2.202.14/32	10.2.202.14 – 10.2.202.14	10.2.202.14
16	10.2.202.15/32	10.2.202.15 – 10.2.202.15	10.2.202.15
17	10.2.202.16/32	10.2.202.16 – 10.2.202.16	10.2.202.16
18	10.2.202.17/32	10.2.202.17 – 10.2.202.17	10.2.202.17
19	10.2.202.18/32	10.2.202.18 – 10.2.202.18	10.2.202.18
20	10.2.202.19/32	10.2.202.19 – 10.2.202.19	10.2.202.19
21	10.2.202.20/32	10.2.202.20 – 10.2.202.20	10.2.202.20
22	10.2.202.21/32	10.2.202.21 – 10.2.202.21	10.2.202.21
23	10.2.202.22/32	10.2.202.22 – 10.2.202.22	10.2.202.22
24	10.2.202.23/32	10.2.202.23 – 10.2.202.23	10.2.202.23
25	10.2.202.24/32	10.2.202.24 – 10.2.202.24	10.2.202.24
26	10.2.202.25/32	10.2.202.25 – 10.2.202.25	10.2.202.25
27	10.2.202.26/32	10.2.202.26 – 10.2.202.26	10.2.202.26
28	10.2.202.27/32	10.2.202.27 – 10.2.202.27	10.2.202.27
29	10.2.202.28/32	10.2.202.28 – 10.2.202.28	10.2.202.28
30	10.2.202.29/32	10.2.202.29 – 10.2.202.29	10.2.202.29
31	10.2.202.30/32	10.2.202.30 – 10.2.202.30	10.2.202.30
32	10.2.202.31/32	10.2.202.31 – 10.2.202.31	10.2.202.31
33	10.2.202.32/32	10.2.202.32 – 10.2.202.32	10.2.202.32
34	10.2.202.33/32	10.2.202.33 – 10.2.202.33	10.2.202.33
35	10.2.202.34/32	10.2.202.34 – 10.2.202.34	10.2.202.34
36	10.2.202.35/32	10.2.202.35 – 10.2.202.35	10.2.202.35
37	10.2.202.36/32	10.2.202.36 – 10.2.202.36	10.2.202.36
38	10.2.202.37/32	10.2.202.37 – 10.2.202.37	10.2.202.37
39	10.2.202.38/32	10.2.202.38 – 10.2.202.38	10.2.202.38
40	10.2.202.39/32	10.2.202.39 – 10.2.202.39	10.2.202.39
41	10.2.202.40/32	10.2.202.40 – 10.2.202.40	10.2.202.40
42	10.2.202.41/32	10.2.202.41 – 10.2.202.41	10.2.202.41
43	10.2.202.42/32	10.2.202.42 – 10.2.202.42	10.2.202.42
44	10.2.202.43/32	10.2.202.43 – 10.2.202.43	10.2.202.43
45	10.2.202.44/32	10.2.202.44 – 10.2.202.44	10.2.202.44
46	10.2.202.45/32	10.2.202.45 – 10.2.202.45	10.2.202.45
47	10.2.202.46/32	10.2.202.46 – 10.2.202.46	10.2.202.46
48	10.2.202.47/32	10.2.202.47 – 10.2.202.47	10.2.202.47
49	10.2.202.48/32	10.2.202.48 – 10.2.202.48	10.2.202.48
50	10.2.202.49/32	10.2.202.49 – 10.2.202.49	10.2.202.49
51	10.2.202.50/32	10.2.202.50 – 10.2.202.50	10.2.202.50
52	10.2.202.51/32	10.2.202.51 – 10.2.202.51	10.2.202.51
53	10.2.202.52/32	10.2.202.52 – 10.2.202.52	10.2.202.52
54	10.2.202.53/32	10.2.202.53 – 10.2.202.53	10.2.202.53
55	10.2.202.54/32	10.2.202.54 – 10.2.202.54	10.2.202.54
56	10.2.202.55/32	10.2.202.55 – 10.2.202.55	10.2.202.55
57	10.2.202.56/32	10.2.202.56 – 10.2.202.56	10.2.202.56
58	10.2.202.57/32	10.2.202.57 – 10.2.202.57	10.2.202.57
59	10.2.202.58/32	10.2.202.58 – 10.2.202.58	10.2.202.58
60	10.2.202.59/32	10.2.202.59 – 10.2.202.59	10.2.202.59
61	10.2.202.60/32	10.2.202.60 – 10.2.202.60	10.2.202.60
62	10.2.202.61/32	10.2.202.61 – 10.2.202.61	10.2.202.61
63	10.2.202.62/32	10.2.202.62 – 10.2.202.62	10.2.202.62
64	10.2.202.63/32	10.2.202.63 – 10.2.202.63	10.2.202.63
65	10.2.202.64/32	10.2.202.64 – 10.2.202.64	10.2.202.64
66	10.2.202.65/32	10.2.202.65 – 10.2.202.65	10.2.202.65
67	10.2.202.66/32	10.2.202.66 – 10.2.202.66	10.2.202.66
68	10.2.202.67/32	10.2.202.67 – 10.2.202.67	10.2.202.67
69	10.2.202.68/32	10.2.202.68 – 10.2.202.68	10.2.202.68
70	10.2.202.69/32	10.2.202.69 – 10.2.202.69	10.2.202.69
71	10.2.202.70/32	10.2.202.70 – 10.2.202.70	10.2.202.70
72	10.2.202.71/32	10.2.202.71 – 10.2.202.71	10.2.202.71
73	10.2.202.72/32	10.2.202.72 – 10.2.202.72	10.2.202.72
74	10.2.202.73/32	10.2.202.73 – 10.2.202.73	10.2.202.73
75	10.2.202.74/32	10.2.202.74 – 10.2.202.74	10.2.202.74
76	10.2.202.75/32	10.2.202.75 – 10.2.202.75	10.2.202.75
77	10.2.202.76/32	10.2.202.76 – 10.2.202.76	10.2.202.76
78	10.2.202.77/32	10.2.202.77 – 10.2.202.77	10.2.202.77
79	10.2.202.78/32	10.2.202.78 – 10.2.202.78	10.2.202.78
80	10.2.202.79/32	10.2.202.79 – 10.2.202.79	10.2.202.79
81	10.2.202.80/32	10.2.202.80 – 10.2.202.80	10.2.202.80
82	10.2.202.81/32	10.2.202.81 – 10.2.202.81	10.2.202.81
83	10.2.202.82/32	10.2.202.82 – 10.2.202.82	10.2.202.82
84	10.2.202.83/32	10.2.202.83 – 10.2.202.83	10.2.202.83
85	10.2.202.84/32	10.2.202.84 – 10.2.202.84	10.2.202.84
86	10.2.202.85/32	10.2.202.85 – 10.2.202.85	10.2.202.85
87	10.2.202.86/32	10.2.202.86 – 10.2.202.86	10.2.202.86
88	10.2.202.87/32	10.2.202.87 – 10.2.202.87	10.2.202.87
89	10.2.202.88/32	10.2.202.88 – 10.2.202.88	10.2.202.88
90	10.2.202.89/32	10.2.202.89 – 10.2.202.89	10.2.202.89
91	10.2.202.90/32	10.2.202.90 – 10.2.202.90	10.2.202.90
92	10.2.202.91/32	10.2.202.91 – 10.2.202.91	10.2.202.91
93	10.2.202.92/32	10.2.202.92 – 10.2.202.92	10.2.202.92
94	10.2.202.93/32	10.2.202.93 – 10.2.202.93	10.2.202.93
95	10.2.202.94/32	10.2.202.94 – 10.2.202.94	10.2.202.94
96	10.2.202.95/32	10.2.202.95 – 10.2.202.95	10.2.202.95
97	10.2.202.96/32	10.2.202.96 – 10.2.202.96	10.2.202.96
98	10.2.202.97/32	10.2.202.97 – 10.2.202.97	10.2.202.97
99	10.2.202.98/32	10.2.202.98 – 10.2.202.98	10.2.202.98
100	10.2.202.99/32	10.2.202.99 – 10.2.202.99	10.2.202.99
101	10.2.202.100/32	10.2.202.100 – 10.2.202.100	10.2.202.100
102	10.2.202.101/32	10.2.202.101 – 10.2.202.101	10.2.202.101
103	10.2.202.102/32	10.2.202.102 – 10.2.202.102	10.2.202.102
104	10.2.202.103/32	10.2.202.103 – 10.2.202.103	10.2.202.103
105	10.2.202.104/32	10.2.202.104 – 10.2.202.104	10.2.202.104
106	10.2.202.105/32	10.2.202.105 – 10.2.202.105	10.2.202.105
107	10.2.202.106/32	10.2.202.106 – 10.2.202.106	10.2.202.106
108	10.2.202.107/32	10.2.202.107 – 10.2.202.107	10.2.202.107
109	10.2.202.108/32	10.2.202.108 – 10.2.202.108	10.2.202.108
110	10.2.202.109/32	10.2.202.109 – 10.2.202.109	10.2.202.109
111	10.2.202.110/32	10.2.202.110 – 10.2.202.110	10.2.202.110
112	10.2.202.111/32	10.2.202.111 – 10.2.202.111	10.2.202.111
113	10.2.202.112/32	10.2.202.112 – 10.2.202.112	10.2.202.112
114	10.2.202.113/32	10.2.202.113 – 10.2.202.113	10.2.202.113
115	10.2.202.114/32	10.2.202.114 – 10.2.202.114	10.2.202.114
116	10.2.202.115/32	10.2.202.115 – 10.2.202.115	10.2.202.115
117	10.2.202.116/32	10.2.202.116 – 10.2.202.116	10.2.202.116
118	10.2.202.117/32	10.2.202.117 – 10.2.202.117	10.2.202.117
119	10.2.202.118/32	10.2.202.118 – 10.2.202.118	10.2.202.118
120	10.2.202.119/32	10.2.202.119 – 10.2.202.119	10.2.202.119
121	10.2.202.120/32	10.2.202.120 – 10.2.202.120	10.2.202.120
122	10.2.202.121/32	10.2.202.121 – 10.2.202.121	10.2.202.121
123	10.2.202.122/32	10.2.202.122 – 10.2.202.122	10.2.202.122
124	10.2.202.123/32	10.2.202.123 – 10.2.202.123	10.2.202.123
125	10.2.202.124/32	10.2.202.124 – 10.2.202.124	10.2.202.124
126	10.2.202.125/32	10.2.202.125 – 10.2.202.125	10.2.202.125
127	10.2.202.126/32	10.2.202.126 – 10.2.202.126	10.2.202.126
128	10.2.202.127/32	10.2.202.127 – 10.2.202.127	10.2.202.127

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 →