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)10.0.97.0/25

network10.0.97.0/25

broadcast10.0.97.127

first host10.0.97.1

last host10.0.97.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.97.0/25

address00001010.00000000.01100001.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.01100001.00000000

broadcast00001010.00000000.01100001.01111111

green = network part, grey = host part

hex0x0a006100

decimal167796992

reverse dns0.97.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:6100

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.97.0/32	10.0.97.0 – 10.0.97.0	10.0.97.0
2	10.0.97.1/32	10.0.97.1 – 10.0.97.1	10.0.97.1
3	10.0.97.2/32	10.0.97.2 – 10.0.97.2	10.0.97.2
4	10.0.97.3/32	10.0.97.3 – 10.0.97.3	10.0.97.3
5	10.0.97.4/32	10.0.97.4 – 10.0.97.4	10.0.97.4
6	10.0.97.5/32	10.0.97.5 – 10.0.97.5	10.0.97.5
7	10.0.97.6/32	10.0.97.6 – 10.0.97.6	10.0.97.6
8	10.0.97.7/32	10.0.97.7 – 10.0.97.7	10.0.97.7
9	10.0.97.8/32	10.0.97.8 – 10.0.97.8	10.0.97.8
10	10.0.97.9/32	10.0.97.9 – 10.0.97.9	10.0.97.9
11	10.0.97.10/32	10.0.97.10 – 10.0.97.10	10.0.97.10
12	10.0.97.11/32	10.0.97.11 – 10.0.97.11	10.0.97.11
13	10.0.97.12/32	10.0.97.12 – 10.0.97.12	10.0.97.12
14	10.0.97.13/32	10.0.97.13 – 10.0.97.13	10.0.97.13
15	10.0.97.14/32	10.0.97.14 – 10.0.97.14	10.0.97.14
16	10.0.97.15/32	10.0.97.15 – 10.0.97.15	10.0.97.15
17	10.0.97.16/32	10.0.97.16 – 10.0.97.16	10.0.97.16
18	10.0.97.17/32	10.0.97.17 – 10.0.97.17	10.0.97.17
19	10.0.97.18/32	10.0.97.18 – 10.0.97.18	10.0.97.18
20	10.0.97.19/32	10.0.97.19 – 10.0.97.19	10.0.97.19
21	10.0.97.20/32	10.0.97.20 – 10.0.97.20	10.0.97.20
22	10.0.97.21/32	10.0.97.21 – 10.0.97.21	10.0.97.21
23	10.0.97.22/32	10.0.97.22 – 10.0.97.22	10.0.97.22
24	10.0.97.23/32	10.0.97.23 – 10.0.97.23	10.0.97.23
25	10.0.97.24/32	10.0.97.24 – 10.0.97.24	10.0.97.24
26	10.0.97.25/32	10.0.97.25 – 10.0.97.25	10.0.97.25
27	10.0.97.26/32	10.0.97.26 – 10.0.97.26	10.0.97.26
28	10.0.97.27/32	10.0.97.27 – 10.0.97.27	10.0.97.27
29	10.0.97.28/32	10.0.97.28 – 10.0.97.28	10.0.97.28
30	10.0.97.29/32	10.0.97.29 – 10.0.97.29	10.0.97.29
31	10.0.97.30/32	10.0.97.30 – 10.0.97.30	10.0.97.30
32	10.0.97.31/32	10.0.97.31 – 10.0.97.31	10.0.97.31
33	10.0.97.32/32	10.0.97.32 – 10.0.97.32	10.0.97.32
34	10.0.97.33/32	10.0.97.33 – 10.0.97.33	10.0.97.33
35	10.0.97.34/32	10.0.97.34 – 10.0.97.34	10.0.97.34
36	10.0.97.35/32	10.0.97.35 – 10.0.97.35	10.0.97.35
37	10.0.97.36/32	10.0.97.36 – 10.0.97.36	10.0.97.36
38	10.0.97.37/32	10.0.97.37 – 10.0.97.37	10.0.97.37
39	10.0.97.38/32	10.0.97.38 – 10.0.97.38	10.0.97.38
40	10.0.97.39/32	10.0.97.39 – 10.0.97.39	10.0.97.39
41	10.0.97.40/32	10.0.97.40 – 10.0.97.40	10.0.97.40
42	10.0.97.41/32	10.0.97.41 – 10.0.97.41	10.0.97.41
43	10.0.97.42/32	10.0.97.42 – 10.0.97.42	10.0.97.42
44	10.0.97.43/32	10.0.97.43 – 10.0.97.43	10.0.97.43
45	10.0.97.44/32	10.0.97.44 – 10.0.97.44	10.0.97.44
46	10.0.97.45/32	10.0.97.45 – 10.0.97.45	10.0.97.45
47	10.0.97.46/32	10.0.97.46 – 10.0.97.46	10.0.97.46
48	10.0.97.47/32	10.0.97.47 – 10.0.97.47	10.0.97.47
49	10.0.97.48/32	10.0.97.48 – 10.0.97.48	10.0.97.48
50	10.0.97.49/32	10.0.97.49 – 10.0.97.49	10.0.97.49
51	10.0.97.50/32	10.0.97.50 – 10.0.97.50	10.0.97.50
52	10.0.97.51/32	10.0.97.51 – 10.0.97.51	10.0.97.51
53	10.0.97.52/32	10.0.97.52 – 10.0.97.52	10.0.97.52
54	10.0.97.53/32	10.0.97.53 – 10.0.97.53	10.0.97.53
55	10.0.97.54/32	10.0.97.54 – 10.0.97.54	10.0.97.54
56	10.0.97.55/32	10.0.97.55 – 10.0.97.55	10.0.97.55
57	10.0.97.56/32	10.0.97.56 – 10.0.97.56	10.0.97.56
58	10.0.97.57/32	10.0.97.57 – 10.0.97.57	10.0.97.57
59	10.0.97.58/32	10.0.97.58 – 10.0.97.58	10.0.97.58
60	10.0.97.59/32	10.0.97.59 – 10.0.97.59	10.0.97.59
61	10.0.97.60/32	10.0.97.60 – 10.0.97.60	10.0.97.60
62	10.0.97.61/32	10.0.97.61 – 10.0.97.61	10.0.97.61
63	10.0.97.62/32	10.0.97.62 – 10.0.97.62	10.0.97.62
64	10.0.97.63/32	10.0.97.63 – 10.0.97.63	10.0.97.63
65	10.0.97.64/32	10.0.97.64 – 10.0.97.64	10.0.97.64
66	10.0.97.65/32	10.0.97.65 – 10.0.97.65	10.0.97.65
67	10.0.97.66/32	10.0.97.66 – 10.0.97.66	10.0.97.66
68	10.0.97.67/32	10.0.97.67 – 10.0.97.67	10.0.97.67
69	10.0.97.68/32	10.0.97.68 – 10.0.97.68	10.0.97.68
70	10.0.97.69/32	10.0.97.69 – 10.0.97.69	10.0.97.69
71	10.0.97.70/32	10.0.97.70 – 10.0.97.70	10.0.97.70
72	10.0.97.71/32	10.0.97.71 – 10.0.97.71	10.0.97.71
73	10.0.97.72/32	10.0.97.72 – 10.0.97.72	10.0.97.72
74	10.0.97.73/32	10.0.97.73 – 10.0.97.73	10.0.97.73
75	10.0.97.74/32	10.0.97.74 – 10.0.97.74	10.0.97.74
76	10.0.97.75/32	10.0.97.75 – 10.0.97.75	10.0.97.75
77	10.0.97.76/32	10.0.97.76 – 10.0.97.76	10.0.97.76
78	10.0.97.77/32	10.0.97.77 – 10.0.97.77	10.0.97.77
79	10.0.97.78/32	10.0.97.78 – 10.0.97.78	10.0.97.78
80	10.0.97.79/32	10.0.97.79 – 10.0.97.79	10.0.97.79
81	10.0.97.80/32	10.0.97.80 – 10.0.97.80	10.0.97.80
82	10.0.97.81/32	10.0.97.81 – 10.0.97.81	10.0.97.81
83	10.0.97.82/32	10.0.97.82 – 10.0.97.82	10.0.97.82
84	10.0.97.83/32	10.0.97.83 – 10.0.97.83	10.0.97.83
85	10.0.97.84/32	10.0.97.84 – 10.0.97.84	10.0.97.84
86	10.0.97.85/32	10.0.97.85 – 10.0.97.85	10.0.97.85
87	10.0.97.86/32	10.0.97.86 – 10.0.97.86	10.0.97.86
88	10.0.97.87/32	10.0.97.87 – 10.0.97.87	10.0.97.87
89	10.0.97.88/32	10.0.97.88 – 10.0.97.88	10.0.97.88
90	10.0.97.89/32	10.0.97.89 – 10.0.97.89	10.0.97.89
91	10.0.97.90/32	10.0.97.90 – 10.0.97.90	10.0.97.90
92	10.0.97.91/32	10.0.97.91 – 10.0.97.91	10.0.97.91
93	10.0.97.92/32	10.0.97.92 – 10.0.97.92	10.0.97.92
94	10.0.97.93/32	10.0.97.93 – 10.0.97.93	10.0.97.93
95	10.0.97.94/32	10.0.97.94 – 10.0.97.94	10.0.97.94
96	10.0.97.95/32	10.0.97.95 – 10.0.97.95	10.0.97.95
97	10.0.97.96/32	10.0.97.96 – 10.0.97.96	10.0.97.96
98	10.0.97.97/32	10.0.97.97 – 10.0.97.97	10.0.97.97
99	10.0.97.98/32	10.0.97.98 – 10.0.97.98	10.0.97.98
100	10.0.97.99/32	10.0.97.99 – 10.0.97.99	10.0.97.99
101	10.0.97.100/32	10.0.97.100 – 10.0.97.100	10.0.97.100
102	10.0.97.101/32	10.0.97.101 – 10.0.97.101	10.0.97.101
103	10.0.97.102/32	10.0.97.102 – 10.0.97.102	10.0.97.102
104	10.0.97.103/32	10.0.97.103 – 10.0.97.103	10.0.97.103
105	10.0.97.104/32	10.0.97.104 – 10.0.97.104	10.0.97.104
106	10.0.97.105/32	10.0.97.105 – 10.0.97.105	10.0.97.105
107	10.0.97.106/32	10.0.97.106 – 10.0.97.106	10.0.97.106
108	10.0.97.107/32	10.0.97.107 – 10.0.97.107	10.0.97.107
109	10.0.97.108/32	10.0.97.108 – 10.0.97.108	10.0.97.108
110	10.0.97.109/32	10.0.97.109 – 10.0.97.109	10.0.97.109
111	10.0.97.110/32	10.0.97.110 – 10.0.97.110	10.0.97.110
112	10.0.97.111/32	10.0.97.111 – 10.0.97.111	10.0.97.111
113	10.0.97.112/32	10.0.97.112 – 10.0.97.112	10.0.97.112
114	10.0.97.113/32	10.0.97.113 – 10.0.97.113	10.0.97.113
115	10.0.97.114/32	10.0.97.114 – 10.0.97.114	10.0.97.114
116	10.0.97.115/32	10.0.97.115 – 10.0.97.115	10.0.97.115
117	10.0.97.116/32	10.0.97.116 – 10.0.97.116	10.0.97.116
118	10.0.97.117/32	10.0.97.117 – 10.0.97.117	10.0.97.117
119	10.0.97.118/32	10.0.97.118 – 10.0.97.118	10.0.97.118
120	10.0.97.119/32	10.0.97.119 – 10.0.97.119	10.0.97.119
121	10.0.97.120/32	10.0.97.120 – 10.0.97.120	10.0.97.120
122	10.0.97.121/32	10.0.97.121 – 10.0.97.121	10.0.97.121
123	10.0.97.122/32	10.0.97.122 – 10.0.97.122	10.0.97.122
124	10.0.97.123/32	10.0.97.123 – 10.0.97.123	10.0.97.123
125	10.0.97.124/32	10.0.97.124 – 10.0.97.124	10.0.97.124
126	10.0.97.125/32	10.0.97.125 – 10.0.97.125	10.0.97.125
127	10.0.97.126/32	10.0.97.126 – 10.0.97.126	10.0.97.126
128	10.0.97.127/32	10.0.97.127 – 10.0.97.127	10.0.97.127

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 →