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)10.2.193.0/25

network10.2.193.0/25

broadcast10.2.193.127

first host10.2.193.1

last host10.2.193.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.193.0/25

address00001010.00000010.11000001.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.11000001.00000000

broadcast00001010.00000010.11000001.01111111

green = network part, grey = host part

hex0x0a02c100

decimal167952640

reverse dns0.193.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:c100

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.193.0/32	10.2.193.0 – 10.2.193.0	10.2.193.0
2	10.2.193.1/32	10.2.193.1 – 10.2.193.1	10.2.193.1
3	10.2.193.2/32	10.2.193.2 – 10.2.193.2	10.2.193.2
4	10.2.193.3/32	10.2.193.3 – 10.2.193.3	10.2.193.3
5	10.2.193.4/32	10.2.193.4 – 10.2.193.4	10.2.193.4
6	10.2.193.5/32	10.2.193.5 – 10.2.193.5	10.2.193.5
7	10.2.193.6/32	10.2.193.6 – 10.2.193.6	10.2.193.6
8	10.2.193.7/32	10.2.193.7 – 10.2.193.7	10.2.193.7
9	10.2.193.8/32	10.2.193.8 – 10.2.193.8	10.2.193.8
10	10.2.193.9/32	10.2.193.9 – 10.2.193.9	10.2.193.9
11	10.2.193.10/32	10.2.193.10 – 10.2.193.10	10.2.193.10
12	10.2.193.11/32	10.2.193.11 – 10.2.193.11	10.2.193.11
13	10.2.193.12/32	10.2.193.12 – 10.2.193.12	10.2.193.12
14	10.2.193.13/32	10.2.193.13 – 10.2.193.13	10.2.193.13
15	10.2.193.14/32	10.2.193.14 – 10.2.193.14	10.2.193.14
16	10.2.193.15/32	10.2.193.15 – 10.2.193.15	10.2.193.15
17	10.2.193.16/32	10.2.193.16 – 10.2.193.16	10.2.193.16
18	10.2.193.17/32	10.2.193.17 – 10.2.193.17	10.2.193.17
19	10.2.193.18/32	10.2.193.18 – 10.2.193.18	10.2.193.18
20	10.2.193.19/32	10.2.193.19 – 10.2.193.19	10.2.193.19
21	10.2.193.20/32	10.2.193.20 – 10.2.193.20	10.2.193.20
22	10.2.193.21/32	10.2.193.21 – 10.2.193.21	10.2.193.21
23	10.2.193.22/32	10.2.193.22 – 10.2.193.22	10.2.193.22
24	10.2.193.23/32	10.2.193.23 – 10.2.193.23	10.2.193.23
25	10.2.193.24/32	10.2.193.24 – 10.2.193.24	10.2.193.24
26	10.2.193.25/32	10.2.193.25 – 10.2.193.25	10.2.193.25
27	10.2.193.26/32	10.2.193.26 – 10.2.193.26	10.2.193.26
28	10.2.193.27/32	10.2.193.27 – 10.2.193.27	10.2.193.27
29	10.2.193.28/32	10.2.193.28 – 10.2.193.28	10.2.193.28
30	10.2.193.29/32	10.2.193.29 – 10.2.193.29	10.2.193.29
31	10.2.193.30/32	10.2.193.30 – 10.2.193.30	10.2.193.30
32	10.2.193.31/32	10.2.193.31 – 10.2.193.31	10.2.193.31
33	10.2.193.32/32	10.2.193.32 – 10.2.193.32	10.2.193.32
34	10.2.193.33/32	10.2.193.33 – 10.2.193.33	10.2.193.33
35	10.2.193.34/32	10.2.193.34 – 10.2.193.34	10.2.193.34
36	10.2.193.35/32	10.2.193.35 – 10.2.193.35	10.2.193.35
37	10.2.193.36/32	10.2.193.36 – 10.2.193.36	10.2.193.36
38	10.2.193.37/32	10.2.193.37 – 10.2.193.37	10.2.193.37
39	10.2.193.38/32	10.2.193.38 – 10.2.193.38	10.2.193.38
40	10.2.193.39/32	10.2.193.39 – 10.2.193.39	10.2.193.39
41	10.2.193.40/32	10.2.193.40 – 10.2.193.40	10.2.193.40
42	10.2.193.41/32	10.2.193.41 – 10.2.193.41	10.2.193.41
43	10.2.193.42/32	10.2.193.42 – 10.2.193.42	10.2.193.42
44	10.2.193.43/32	10.2.193.43 – 10.2.193.43	10.2.193.43
45	10.2.193.44/32	10.2.193.44 – 10.2.193.44	10.2.193.44
46	10.2.193.45/32	10.2.193.45 – 10.2.193.45	10.2.193.45
47	10.2.193.46/32	10.2.193.46 – 10.2.193.46	10.2.193.46
48	10.2.193.47/32	10.2.193.47 – 10.2.193.47	10.2.193.47
49	10.2.193.48/32	10.2.193.48 – 10.2.193.48	10.2.193.48
50	10.2.193.49/32	10.2.193.49 – 10.2.193.49	10.2.193.49
51	10.2.193.50/32	10.2.193.50 – 10.2.193.50	10.2.193.50
52	10.2.193.51/32	10.2.193.51 – 10.2.193.51	10.2.193.51
53	10.2.193.52/32	10.2.193.52 – 10.2.193.52	10.2.193.52
54	10.2.193.53/32	10.2.193.53 – 10.2.193.53	10.2.193.53
55	10.2.193.54/32	10.2.193.54 – 10.2.193.54	10.2.193.54
56	10.2.193.55/32	10.2.193.55 – 10.2.193.55	10.2.193.55
57	10.2.193.56/32	10.2.193.56 – 10.2.193.56	10.2.193.56
58	10.2.193.57/32	10.2.193.57 – 10.2.193.57	10.2.193.57
59	10.2.193.58/32	10.2.193.58 – 10.2.193.58	10.2.193.58
60	10.2.193.59/32	10.2.193.59 – 10.2.193.59	10.2.193.59
61	10.2.193.60/32	10.2.193.60 – 10.2.193.60	10.2.193.60
62	10.2.193.61/32	10.2.193.61 – 10.2.193.61	10.2.193.61
63	10.2.193.62/32	10.2.193.62 – 10.2.193.62	10.2.193.62
64	10.2.193.63/32	10.2.193.63 – 10.2.193.63	10.2.193.63
65	10.2.193.64/32	10.2.193.64 – 10.2.193.64	10.2.193.64
66	10.2.193.65/32	10.2.193.65 – 10.2.193.65	10.2.193.65
67	10.2.193.66/32	10.2.193.66 – 10.2.193.66	10.2.193.66
68	10.2.193.67/32	10.2.193.67 – 10.2.193.67	10.2.193.67
69	10.2.193.68/32	10.2.193.68 – 10.2.193.68	10.2.193.68
70	10.2.193.69/32	10.2.193.69 – 10.2.193.69	10.2.193.69
71	10.2.193.70/32	10.2.193.70 – 10.2.193.70	10.2.193.70
72	10.2.193.71/32	10.2.193.71 – 10.2.193.71	10.2.193.71
73	10.2.193.72/32	10.2.193.72 – 10.2.193.72	10.2.193.72
74	10.2.193.73/32	10.2.193.73 – 10.2.193.73	10.2.193.73
75	10.2.193.74/32	10.2.193.74 – 10.2.193.74	10.2.193.74
76	10.2.193.75/32	10.2.193.75 – 10.2.193.75	10.2.193.75
77	10.2.193.76/32	10.2.193.76 – 10.2.193.76	10.2.193.76
78	10.2.193.77/32	10.2.193.77 – 10.2.193.77	10.2.193.77
79	10.2.193.78/32	10.2.193.78 – 10.2.193.78	10.2.193.78
80	10.2.193.79/32	10.2.193.79 – 10.2.193.79	10.2.193.79
81	10.2.193.80/32	10.2.193.80 – 10.2.193.80	10.2.193.80
82	10.2.193.81/32	10.2.193.81 – 10.2.193.81	10.2.193.81
83	10.2.193.82/32	10.2.193.82 – 10.2.193.82	10.2.193.82
84	10.2.193.83/32	10.2.193.83 – 10.2.193.83	10.2.193.83
85	10.2.193.84/32	10.2.193.84 – 10.2.193.84	10.2.193.84
86	10.2.193.85/32	10.2.193.85 – 10.2.193.85	10.2.193.85
87	10.2.193.86/32	10.2.193.86 – 10.2.193.86	10.2.193.86
88	10.2.193.87/32	10.2.193.87 – 10.2.193.87	10.2.193.87
89	10.2.193.88/32	10.2.193.88 – 10.2.193.88	10.2.193.88
90	10.2.193.89/32	10.2.193.89 – 10.2.193.89	10.2.193.89
91	10.2.193.90/32	10.2.193.90 – 10.2.193.90	10.2.193.90
92	10.2.193.91/32	10.2.193.91 – 10.2.193.91	10.2.193.91
93	10.2.193.92/32	10.2.193.92 – 10.2.193.92	10.2.193.92
94	10.2.193.93/32	10.2.193.93 – 10.2.193.93	10.2.193.93
95	10.2.193.94/32	10.2.193.94 – 10.2.193.94	10.2.193.94
96	10.2.193.95/32	10.2.193.95 – 10.2.193.95	10.2.193.95
97	10.2.193.96/32	10.2.193.96 – 10.2.193.96	10.2.193.96
98	10.2.193.97/32	10.2.193.97 – 10.2.193.97	10.2.193.97
99	10.2.193.98/32	10.2.193.98 – 10.2.193.98	10.2.193.98
100	10.2.193.99/32	10.2.193.99 – 10.2.193.99	10.2.193.99
101	10.2.193.100/32	10.2.193.100 – 10.2.193.100	10.2.193.100
102	10.2.193.101/32	10.2.193.101 – 10.2.193.101	10.2.193.101
103	10.2.193.102/32	10.2.193.102 – 10.2.193.102	10.2.193.102
104	10.2.193.103/32	10.2.193.103 – 10.2.193.103	10.2.193.103
105	10.2.193.104/32	10.2.193.104 – 10.2.193.104	10.2.193.104
106	10.2.193.105/32	10.2.193.105 – 10.2.193.105	10.2.193.105
107	10.2.193.106/32	10.2.193.106 – 10.2.193.106	10.2.193.106
108	10.2.193.107/32	10.2.193.107 – 10.2.193.107	10.2.193.107
109	10.2.193.108/32	10.2.193.108 – 10.2.193.108	10.2.193.108
110	10.2.193.109/32	10.2.193.109 – 10.2.193.109	10.2.193.109
111	10.2.193.110/32	10.2.193.110 – 10.2.193.110	10.2.193.110
112	10.2.193.111/32	10.2.193.111 – 10.2.193.111	10.2.193.111
113	10.2.193.112/32	10.2.193.112 – 10.2.193.112	10.2.193.112
114	10.2.193.113/32	10.2.193.113 – 10.2.193.113	10.2.193.113
115	10.2.193.114/32	10.2.193.114 – 10.2.193.114	10.2.193.114
116	10.2.193.115/32	10.2.193.115 – 10.2.193.115	10.2.193.115
117	10.2.193.116/32	10.2.193.116 – 10.2.193.116	10.2.193.116
118	10.2.193.117/32	10.2.193.117 – 10.2.193.117	10.2.193.117
119	10.2.193.118/32	10.2.193.118 – 10.2.193.118	10.2.193.118
120	10.2.193.119/32	10.2.193.119 – 10.2.193.119	10.2.193.119
121	10.2.193.120/32	10.2.193.120 – 10.2.193.120	10.2.193.120
122	10.2.193.121/32	10.2.193.121 – 10.2.193.121	10.2.193.121
123	10.2.193.122/32	10.2.193.122 – 10.2.193.122	10.2.193.122
124	10.2.193.123/32	10.2.193.123 – 10.2.193.123	10.2.193.123
125	10.2.193.124/32	10.2.193.124 – 10.2.193.124	10.2.193.124
126	10.2.193.125/32	10.2.193.125 – 10.2.193.125	10.2.193.125
127	10.2.193.126/32	10.2.193.126 – 10.2.193.126	10.2.193.126
128	10.2.193.127/32	10.2.193.127 – 10.2.193.127	10.2.193.127

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 →