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)10.2.58.0/25

network10.2.58.0/25

broadcast10.2.58.127

first host10.2.58.1

last host10.2.58.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.58.0/25

address00001010.00000010.00111010.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.00111010.00000000

broadcast00001010.00000010.00111010.01111111

green = network part, grey = host part

hex0x0a023a00

decimal167918080

reverse dns0.58.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:3a00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.58.0/32	10.2.58.0 – 10.2.58.0	10.2.58.0
2	10.2.58.1/32	10.2.58.1 – 10.2.58.1	10.2.58.1
3	10.2.58.2/32	10.2.58.2 – 10.2.58.2	10.2.58.2
4	10.2.58.3/32	10.2.58.3 – 10.2.58.3	10.2.58.3
5	10.2.58.4/32	10.2.58.4 – 10.2.58.4	10.2.58.4
6	10.2.58.5/32	10.2.58.5 – 10.2.58.5	10.2.58.5
7	10.2.58.6/32	10.2.58.6 – 10.2.58.6	10.2.58.6
8	10.2.58.7/32	10.2.58.7 – 10.2.58.7	10.2.58.7
9	10.2.58.8/32	10.2.58.8 – 10.2.58.8	10.2.58.8
10	10.2.58.9/32	10.2.58.9 – 10.2.58.9	10.2.58.9
11	10.2.58.10/32	10.2.58.10 – 10.2.58.10	10.2.58.10
12	10.2.58.11/32	10.2.58.11 – 10.2.58.11	10.2.58.11
13	10.2.58.12/32	10.2.58.12 – 10.2.58.12	10.2.58.12
14	10.2.58.13/32	10.2.58.13 – 10.2.58.13	10.2.58.13
15	10.2.58.14/32	10.2.58.14 – 10.2.58.14	10.2.58.14
16	10.2.58.15/32	10.2.58.15 – 10.2.58.15	10.2.58.15
17	10.2.58.16/32	10.2.58.16 – 10.2.58.16	10.2.58.16
18	10.2.58.17/32	10.2.58.17 – 10.2.58.17	10.2.58.17
19	10.2.58.18/32	10.2.58.18 – 10.2.58.18	10.2.58.18
20	10.2.58.19/32	10.2.58.19 – 10.2.58.19	10.2.58.19
21	10.2.58.20/32	10.2.58.20 – 10.2.58.20	10.2.58.20
22	10.2.58.21/32	10.2.58.21 – 10.2.58.21	10.2.58.21
23	10.2.58.22/32	10.2.58.22 – 10.2.58.22	10.2.58.22
24	10.2.58.23/32	10.2.58.23 – 10.2.58.23	10.2.58.23
25	10.2.58.24/32	10.2.58.24 – 10.2.58.24	10.2.58.24
26	10.2.58.25/32	10.2.58.25 – 10.2.58.25	10.2.58.25
27	10.2.58.26/32	10.2.58.26 – 10.2.58.26	10.2.58.26
28	10.2.58.27/32	10.2.58.27 – 10.2.58.27	10.2.58.27
29	10.2.58.28/32	10.2.58.28 – 10.2.58.28	10.2.58.28
30	10.2.58.29/32	10.2.58.29 – 10.2.58.29	10.2.58.29
31	10.2.58.30/32	10.2.58.30 – 10.2.58.30	10.2.58.30
32	10.2.58.31/32	10.2.58.31 – 10.2.58.31	10.2.58.31
33	10.2.58.32/32	10.2.58.32 – 10.2.58.32	10.2.58.32
34	10.2.58.33/32	10.2.58.33 – 10.2.58.33	10.2.58.33
35	10.2.58.34/32	10.2.58.34 – 10.2.58.34	10.2.58.34
36	10.2.58.35/32	10.2.58.35 – 10.2.58.35	10.2.58.35
37	10.2.58.36/32	10.2.58.36 – 10.2.58.36	10.2.58.36
38	10.2.58.37/32	10.2.58.37 – 10.2.58.37	10.2.58.37
39	10.2.58.38/32	10.2.58.38 – 10.2.58.38	10.2.58.38
40	10.2.58.39/32	10.2.58.39 – 10.2.58.39	10.2.58.39
41	10.2.58.40/32	10.2.58.40 – 10.2.58.40	10.2.58.40
42	10.2.58.41/32	10.2.58.41 – 10.2.58.41	10.2.58.41
43	10.2.58.42/32	10.2.58.42 – 10.2.58.42	10.2.58.42
44	10.2.58.43/32	10.2.58.43 – 10.2.58.43	10.2.58.43
45	10.2.58.44/32	10.2.58.44 – 10.2.58.44	10.2.58.44
46	10.2.58.45/32	10.2.58.45 – 10.2.58.45	10.2.58.45
47	10.2.58.46/32	10.2.58.46 – 10.2.58.46	10.2.58.46
48	10.2.58.47/32	10.2.58.47 – 10.2.58.47	10.2.58.47
49	10.2.58.48/32	10.2.58.48 – 10.2.58.48	10.2.58.48
50	10.2.58.49/32	10.2.58.49 – 10.2.58.49	10.2.58.49
51	10.2.58.50/32	10.2.58.50 – 10.2.58.50	10.2.58.50
52	10.2.58.51/32	10.2.58.51 – 10.2.58.51	10.2.58.51
53	10.2.58.52/32	10.2.58.52 – 10.2.58.52	10.2.58.52
54	10.2.58.53/32	10.2.58.53 – 10.2.58.53	10.2.58.53
55	10.2.58.54/32	10.2.58.54 – 10.2.58.54	10.2.58.54
56	10.2.58.55/32	10.2.58.55 – 10.2.58.55	10.2.58.55
57	10.2.58.56/32	10.2.58.56 – 10.2.58.56	10.2.58.56
58	10.2.58.57/32	10.2.58.57 – 10.2.58.57	10.2.58.57
59	10.2.58.58/32	10.2.58.58 – 10.2.58.58	10.2.58.58
60	10.2.58.59/32	10.2.58.59 – 10.2.58.59	10.2.58.59
61	10.2.58.60/32	10.2.58.60 – 10.2.58.60	10.2.58.60
62	10.2.58.61/32	10.2.58.61 – 10.2.58.61	10.2.58.61
63	10.2.58.62/32	10.2.58.62 – 10.2.58.62	10.2.58.62
64	10.2.58.63/32	10.2.58.63 – 10.2.58.63	10.2.58.63
65	10.2.58.64/32	10.2.58.64 – 10.2.58.64	10.2.58.64
66	10.2.58.65/32	10.2.58.65 – 10.2.58.65	10.2.58.65
67	10.2.58.66/32	10.2.58.66 – 10.2.58.66	10.2.58.66
68	10.2.58.67/32	10.2.58.67 – 10.2.58.67	10.2.58.67
69	10.2.58.68/32	10.2.58.68 – 10.2.58.68	10.2.58.68
70	10.2.58.69/32	10.2.58.69 – 10.2.58.69	10.2.58.69
71	10.2.58.70/32	10.2.58.70 – 10.2.58.70	10.2.58.70
72	10.2.58.71/32	10.2.58.71 – 10.2.58.71	10.2.58.71
73	10.2.58.72/32	10.2.58.72 – 10.2.58.72	10.2.58.72
74	10.2.58.73/32	10.2.58.73 – 10.2.58.73	10.2.58.73
75	10.2.58.74/32	10.2.58.74 – 10.2.58.74	10.2.58.74
76	10.2.58.75/32	10.2.58.75 – 10.2.58.75	10.2.58.75
77	10.2.58.76/32	10.2.58.76 – 10.2.58.76	10.2.58.76
78	10.2.58.77/32	10.2.58.77 – 10.2.58.77	10.2.58.77
79	10.2.58.78/32	10.2.58.78 – 10.2.58.78	10.2.58.78
80	10.2.58.79/32	10.2.58.79 – 10.2.58.79	10.2.58.79
81	10.2.58.80/32	10.2.58.80 – 10.2.58.80	10.2.58.80
82	10.2.58.81/32	10.2.58.81 – 10.2.58.81	10.2.58.81
83	10.2.58.82/32	10.2.58.82 – 10.2.58.82	10.2.58.82
84	10.2.58.83/32	10.2.58.83 – 10.2.58.83	10.2.58.83
85	10.2.58.84/32	10.2.58.84 – 10.2.58.84	10.2.58.84
86	10.2.58.85/32	10.2.58.85 – 10.2.58.85	10.2.58.85
87	10.2.58.86/32	10.2.58.86 – 10.2.58.86	10.2.58.86
88	10.2.58.87/32	10.2.58.87 – 10.2.58.87	10.2.58.87
89	10.2.58.88/32	10.2.58.88 – 10.2.58.88	10.2.58.88
90	10.2.58.89/32	10.2.58.89 – 10.2.58.89	10.2.58.89
91	10.2.58.90/32	10.2.58.90 – 10.2.58.90	10.2.58.90
92	10.2.58.91/32	10.2.58.91 – 10.2.58.91	10.2.58.91
93	10.2.58.92/32	10.2.58.92 – 10.2.58.92	10.2.58.92
94	10.2.58.93/32	10.2.58.93 – 10.2.58.93	10.2.58.93
95	10.2.58.94/32	10.2.58.94 – 10.2.58.94	10.2.58.94
96	10.2.58.95/32	10.2.58.95 – 10.2.58.95	10.2.58.95
97	10.2.58.96/32	10.2.58.96 – 10.2.58.96	10.2.58.96
98	10.2.58.97/32	10.2.58.97 – 10.2.58.97	10.2.58.97
99	10.2.58.98/32	10.2.58.98 – 10.2.58.98	10.2.58.98
100	10.2.58.99/32	10.2.58.99 – 10.2.58.99	10.2.58.99
101	10.2.58.100/32	10.2.58.100 – 10.2.58.100	10.2.58.100
102	10.2.58.101/32	10.2.58.101 – 10.2.58.101	10.2.58.101
103	10.2.58.102/32	10.2.58.102 – 10.2.58.102	10.2.58.102
104	10.2.58.103/32	10.2.58.103 – 10.2.58.103	10.2.58.103
105	10.2.58.104/32	10.2.58.104 – 10.2.58.104	10.2.58.104
106	10.2.58.105/32	10.2.58.105 – 10.2.58.105	10.2.58.105
107	10.2.58.106/32	10.2.58.106 – 10.2.58.106	10.2.58.106
108	10.2.58.107/32	10.2.58.107 – 10.2.58.107	10.2.58.107
109	10.2.58.108/32	10.2.58.108 – 10.2.58.108	10.2.58.108
110	10.2.58.109/32	10.2.58.109 – 10.2.58.109	10.2.58.109
111	10.2.58.110/32	10.2.58.110 – 10.2.58.110	10.2.58.110
112	10.2.58.111/32	10.2.58.111 – 10.2.58.111	10.2.58.111
113	10.2.58.112/32	10.2.58.112 – 10.2.58.112	10.2.58.112
114	10.2.58.113/32	10.2.58.113 – 10.2.58.113	10.2.58.113
115	10.2.58.114/32	10.2.58.114 – 10.2.58.114	10.2.58.114
116	10.2.58.115/32	10.2.58.115 – 10.2.58.115	10.2.58.115
117	10.2.58.116/32	10.2.58.116 – 10.2.58.116	10.2.58.116
118	10.2.58.117/32	10.2.58.117 – 10.2.58.117	10.2.58.117
119	10.2.58.118/32	10.2.58.118 – 10.2.58.118	10.2.58.118
120	10.2.58.119/32	10.2.58.119 – 10.2.58.119	10.2.58.119
121	10.2.58.120/32	10.2.58.120 – 10.2.58.120	10.2.58.120
122	10.2.58.121/32	10.2.58.121 – 10.2.58.121	10.2.58.121
123	10.2.58.122/32	10.2.58.122 – 10.2.58.122	10.2.58.122
124	10.2.58.123/32	10.2.58.123 – 10.2.58.123	10.2.58.123
125	10.2.58.124/32	10.2.58.124 – 10.2.58.124	10.2.58.124
126	10.2.58.125/32	10.2.58.125 – 10.2.58.125	10.2.58.125
127	10.2.58.126/32	10.2.58.126 – 10.2.58.126	10.2.58.126
128	10.2.58.127/32	10.2.58.127 – 10.2.58.127	10.2.58.127

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 →