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)10.0.104.0/25

network10.0.104.0/25

broadcast10.0.104.127

first host10.0.104.1

last host10.0.104.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.104.0/25

address00001010.00000000.01101000.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.01101000.00000000

broadcast00001010.00000000.01101000.01111111

green = network part, grey = host part

hex0x0a006800

decimal167798784

reverse dns0.104.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:6800

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.104.0/32	10.0.104.0 – 10.0.104.0	10.0.104.0
2	10.0.104.1/32	10.0.104.1 – 10.0.104.1	10.0.104.1
3	10.0.104.2/32	10.0.104.2 – 10.0.104.2	10.0.104.2
4	10.0.104.3/32	10.0.104.3 – 10.0.104.3	10.0.104.3
5	10.0.104.4/32	10.0.104.4 – 10.0.104.4	10.0.104.4
6	10.0.104.5/32	10.0.104.5 – 10.0.104.5	10.0.104.5
7	10.0.104.6/32	10.0.104.6 – 10.0.104.6	10.0.104.6
8	10.0.104.7/32	10.0.104.7 – 10.0.104.7	10.0.104.7
9	10.0.104.8/32	10.0.104.8 – 10.0.104.8	10.0.104.8
10	10.0.104.9/32	10.0.104.9 – 10.0.104.9	10.0.104.9
11	10.0.104.10/32	10.0.104.10 – 10.0.104.10	10.0.104.10
12	10.0.104.11/32	10.0.104.11 – 10.0.104.11	10.0.104.11
13	10.0.104.12/32	10.0.104.12 – 10.0.104.12	10.0.104.12
14	10.0.104.13/32	10.0.104.13 – 10.0.104.13	10.0.104.13
15	10.0.104.14/32	10.0.104.14 – 10.0.104.14	10.0.104.14
16	10.0.104.15/32	10.0.104.15 – 10.0.104.15	10.0.104.15
17	10.0.104.16/32	10.0.104.16 – 10.0.104.16	10.0.104.16
18	10.0.104.17/32	10.0.104.17 – 10.0.104.17	10.0.104.17
19	10.0.104.18/32	10.0.104.18 – 10.0.104.18	10.0.104.18
20	10.0.104.19/32	10.0.104.19 – 10.0.104.19	10.0.104.19
21	10.0.104.20/32	10.0.104.20 – 10.0.104.20	10.0.104.20
22	10.0.104.21/32	10.0.104.21 – 10.0.104.21	10.0.104.21
23	10.0.104.22/32	10.0.104.22 – 10.0.104.22	10.0.104.22
24	10.0.104.23/32	10.0.104.23 – 10.0.104.23	10.0.104.23
25	10.0.104.24/32	10.0.104.24 – 10.0.104.24	10.0.104.24
26	10.0.104.25/32	10.0.104.25 – 10.0.104.25	10.0.104.25
27	10.0.104.26/32	10.0.104.26 – 10.0.104.26	10.0.104.26
28	10.0.104.27/32	10.0.104.27 – 10.0.104.27	10.0.104.27
29	10.0.104.28/32	10.0.104.28 – 10.0.104.28	10.0.104.28
30	10.0.104.29/32	10.0.104.29 – 10.0.104.29	10.0.104.29
31	10.0.104.30/32	10.0.104.30 – 10.0.104.30	10.0.104.30
32	10.0.104.31/32	10.0.104.31 – 10.0.104.31	10.0.104.31
33	10.0.104.32/32	10.0.104.32 – 10.0.104.32	10.0.104.32
34	10.0.104.33/32	10.0.104.33 – 10.0.104.33	10.0.104.33
35	10.0.104.34/32	10.0.104.34 – 10.0.104.34	10.0.104.34
36	10.0.104.35/32	10.0.104.35 – 10.0.104.35	10.0.104.35
37	10.0.104.36/32	10.0.104.36 – 10.0.104.36	10.0.104.36
38	10.0.104.37/32	10.0.104.37 – 10.0.104.37	10.0.104.37
39	10.0.104.38/32	10.0.104.38 – 10.0.104.38	10.0.104.38
40	10.0.104.39/32	10.0.104.39 – 10.0.104.39	10.0.104.39
41	10.0.104.40/32	10.0.104.40 – 10.0.104.40	10.0.104.40
42	10.0.104.41/32	10.0.104.41 – 10.0.104.41	10.0.104.41
43	10.0.104.42/32	10.0.104.42 – 10.0.104.42	10.0.104.42
44	10.0.104.43/32	10.0.104.43 – 10.0.104.43	10.0.104.43
45	10.0.104.44/32	10.0.104.44 – 10.0.104.44	10.0.104.44
46	10.0.104.45/32	10.0.104.45 – 10.0.104.45	10.0.104.45
47	10.0.104.46/32	10.0.104.46 – 10.0.104.46	10.0.104.46
48	10.0.104.47/32	10.0.104.47 – 10.0.104.47	10.0.104.47
49	10.0.104.48/32	10.0.104.48 – 10.0.104.48	10.0.104.48
50	10.0.104.49/32	10.0.104.49 – 10.0.104.49	10.0.104.49
51	10.0.104.50/32	10.0.104.50 – 10.0.104.50	10.0.104.50
52	10.0.104.51/32	10.0.104.51 – 10.0.104.51	10.0.104.51
53	10.0.104.52/32	10.0.104.52 – 10.0.104.52	10.0.104.52
54	10.0.104.53/32	10.0.104.53 – 10.0.104.53	10.0.104.53
55	10.0.104.54/32	10.0.104.54 – 10.0.104.54	10.0.104.54
56	10.0.104.55/32	10.0.104.55 – 10.0.104.55	10.0.104.55
57	10.0.104.56/32	10.0.104.56 – 10.0.104.56	10.0.104.56
58	10.0.104.57/32	10.0.104.57 – 10.0.104.57	10.0.104.57
59	10.0.104.58/32	10.0.104.58 – 10.0.104.58	10.0.104.58
60	10.0.104.59/32	10.0.104.59 – 10.0.104.59	10.0.104.59
61	10.0.104.60/32	10.0.104.60 – 10.0.104.60	10.0.104.60
62	10.0.104.61/32	10.0.104.61 – 10.0.104.61	10.0.104.61
63	10.0.104.62/32	10.0.104.62 – 10.0.104.62	10.0.104.62
64	10.0.104.63/32	10.0.104.63 – 10.0.104.63	10.0.104.63
65	10.0.104.64/32	10.0.104.64 – 10.0.104.64	10.0.104.64
66	10.0.104.65/32	10.0.104.65 – 10.0.104.65	10.0.104.65
67	10.0.104.66/32	10.0.104.66 – 10.0.104.66	10.0.104.66
68	10.0.104.67/32	10.0.104.67 – 10.0.104.67	10.0.104.67
69	10.0.104.68/32	10.0.104.68 – 10.0.104.68	10.0.104.68
70	10.0.104.69/32	10.0.104.69 – 10.0.104.69	10.0.104.69
71	10.0.104.70/32	10.0.104.70 – 10.0.104.70	10.0.104.70
72	10.0.104.71/32	10.0.104.71 – 10.0.104.71	10.0.104.71
73	10.0.104.72/32	10.0.104.72 – 10.0.104.72	10.0.104.72
74	10.0.104.73/32	10.0.104.73 – 10.0.104.73	10.0.104.73
75	10.0.104.74/32	10.0.104.74 – 10.0.104.74	10.0.104.74
76	10.0.104.75/32	10.0.104.75 – 10.0.104.75	10.0.104.75
77	10.0.104.76/32	10.0.104.76 – 10.0.104.76	10.0.104.76
78	10.0.104.77/32	10.0.104.77 – 10.0.104.77	10.0.104.77
79	10.0.104.78/32	10.0.104.78 – 10.0.104.78	10.0.104.78
80	10.0.104.79/32	10.0.104.79 – 10.0.104.79	10.0.104.79
81	10.0.104.80/32	10.0.104.80 – 10.0.104.80	10.0.104.80
82	10.0.104.81/32	10.0.104.81 – 10.0.104.81	10.0.104.81
83	10.0.104.82/32	10.0.104.82 – 10.0.104.82	10.0.104.82
84	10.0.104.83/32	10.0.104.83 – 10.0.104.83	10.0.104.83
85	10.0.104.84/32	10.0.104.84 – 10.0.104.84	10.0.104.84
86	10.0.104.85/32	10.0.104.85 – 10.0.104.85	10.0.104.85
87	10.0.104.86/32	10.0.104.86 – 10.0.104.86	10.0.104.86
88	10.0.104.87/32	10.0.104.87 – 10.0.104.87	10.0.104.87
89	10.0.104.88/32	10.0.104.88 – 10.0.104.88	10.0.104.88
90	10.0.104.89/32	10.0.104.89 – 10.0.104.89	10.0.104.89
91	10.0.104.90/32	10.0.104.90 – 10.0.104.90	10.0.104.90
92	10.0.104.91/32	10.0.104.91 – 10.0.104.91	10.0.104.91
93	10.0.104.92/32	10.0.104.92 – 10.0.104.92	10.0.104.92
94	10.0.104.93/32	10.0.104.93 – 10.0.104.93	10.0.104.93
95	10.0.104.94/32	10.0.104.94 – 10.0.104.94	10.0.104.94
96	10.0.104.95/32	10.0.104.95 – 10.0.104.95	10.0.104.95
97	10.0.104.96/32	10.0.104.96 – 10.0.104.96	10.0.104.96
98	10.0.104.97/32	10.0.104.97 – 10.0.104.97	10.0.104.97
99	10.0.104.98/32	10.0.104.98 – 10.0.104.98	10.0.104.98
100	10.0.104.99/32	10.0.104.99 – 10.0.104.99	10.0.104.99
101	10.0.104.100/32	10.0.104.100 – 10.0.104.100	10.0.104.100
102	10.0.104.101/32	10.0.104.101 – 10.0.104.101	10.0.104.101
103	10.0.104.102/32	10.0.104.102 – 10.0.104.102	10.0.104.102
104	10.0.104.103/32	10.0.104.103 – 10.0.104.103	10.0.104.103
105	10.0.104.104/32	10.0.104.104 – 10.0.104.104	10.0.104.104
106	10.0.104.105/32	10.0.104.105 – 10.0.104.105	10.0.104.105
107	10.0.104.106/32	10.0.104.106 – 10.0.104.106	10.0.104.106
108	10.0.104.107/32	10.0.104.107 – 10.0.104.107	10.0.104.107
109	10.0.104.108/32	10.0.104.108 – 10.0.104.108	10.0.104.108
110	10.0.104.109/32	10.0.104.109 – 10.0.104.109	10.0.104.109
111	10.0.104.110/32	10.0.104.110 – 10.0.104.110	10.0.104.110
112	10.0.104.111/32	10.0.104.111 – 10.0.104.111	10.0.104.111
113	10.0.104.112/32	10.0.104.112 – 10.0.104.112	10.0.104.112
114	10.0.104.113/32	10.0.104.113 – 10.0.104.113	10.0.104.113
115	10.0.104.114/32	10.0.104.114 – 10.0.104.114	10.0.104.114
116	10.0.104.115/32	10.0.104.115 – 10.0.104.115	10.0.104.115
117	10.0.104.116/32	10.0.104.116 – 10.0.104.116	10.0.104.116
118	10.0.104.117/32	10.0.104.117 – 10.0.104.117	10.0.104.117
119	10.0.104.118/32	10.0.104.118 – 10.0.104.118	10.0.104.118
120	10.0.104.119/32	10.0.104.119 – 10.0.104.119	10.0.104.119
121	10.0.104.120/32	10.0.104.120 – 10.0.104.120	10.0.104.120
122	10.0.104.121/32	10.0.104.121 – 10.0.104.121	10.0.104.121
123	10.0.104.122/32	10.0.104.122 – 10.0.104.122	10.0.104.122
124	10.0.104.123/32	10.0.104.123 – 10.0.104.123	10.0.104.123
125	10.0.104.124/32	10.0.104.124 – 10.0.104.124	10.0.104.124
126	10.0.104.125/32	10.0.104.125 – 10.0.104.125	10.0.104.125
127	10.0.104.126/32	10.0.104.126 – 10.0.104.126	10.0.104.126
128	10.0.104.127/32	10.0.104.127 – 10.0.104.127	10.0.104.127

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 →