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)10.80.3.0/25

network10.80.3.0/25

broadcast10.80.3.127

first host10.80.3.1

last host10.80.3.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.80.3.0/25

address00001010.01010000.00000011.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.01010000.00000011.00000000

broadcast00001010.01010000.00000011.01111111

green = network part, grey = host part

hex0x0a500300

decimal173015808

reverse dns0.3.80.10.in-addr.arpa

ipv4-mapped::ffff:a50:300

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.80.3.0/32	10.80.3.0 – 10.80.3.0	10.80.3.0
2	10.80.3.1/32	10.80.3.1 – 10.80.3.1	10.80.3.1
3	10.80.3.2/32	10.80.3.2 – 10.80.3.2	10.80.3.2
4	10.80.3.3/32	10.80.3.3 – 10.80.3.3	10.80.3.3
5	10.80.3.4/32	10.80.3.4 – 10.80.3.4	10.80.3.4
6	10.80.3.5/32	10.80.3.5 – 10.80.3.5	10.80.3.5
7	10.80.3.6/32	10.80.3.6 – 10.80.3.6	10.80.3.6
8	10.80.3.7/32	10.80.3.7 – 10.80.3.7	10.80.3.7
9	10.80.3.8/32	10.80.3.8 – 10.80.3.8	10.80.3.8
10	10.80.3.9/32	10.80.3.9 – 10.80.3.9	10.80.3.9
11	10.80.3.10/32	10.80.3.10 – 10.80.3.10	10.80.3.10
12	10.80.3.11/32	10.80.3.11 – 10.80.3.11	10.80.3.11
13	10.80.3.12/32	10.80.3.12 – 10.80.3.12	10.80.3.12
14	10.80.3.13/32	10.80.3.13 – 10.80.3.13	10.80.3.13
15	10.80.3.14/32	10.80.3.14 – 10.80.3.14	10.80.3.14
16	10.80.3.15/32	10.80.3.15 – 10.80.3.15	10.80.3.15
17	10.80.3.16/32	10.80.3.16 – 10.80.3.16	10.80.3.16
18	10.80.3.17/32	10.80.3.17 – 10.80.3.17	10.80.3.17
19	10.80.3.18/32	10.80.3.18 – 10.80.3.18	10.80.3.18
20	10.80.3.19/32	10.80.3.19 – 10.80.3.19	10.80.3.19
21	10.80.3.20/32	10.80.3.20 – 10.80.3.20	10.80.3.20
22	10.80.3.21/32	10.80.3.21 – 10.80.3.21	10.80.3.21
23	10.80.3.22/32	10.80.3.22 – 10.80.3.22	10.80.3.22
24	10.80.3.23/32	10.80.3.23 – 10.80.3.23	10.80.3.23
25	10.80.3.24/32	10.80.3.24 – 10.80.3.24	10.80.3.24
26	10.80.3.25/32	10.80.3.25 – 10.80.3.25	10.80.3.25
27	10.80.3.26/32	10.80.3.26 – 10.80.3.26	10.80.3.26
28	10.80.3.27/32	10.80.3.27 – 10.80.3.27	10.80.3.27
29	10.80.3.28/32	10.80.3.28 – 10.80.3.28	10.80.3.28
30	10.80.3.29/32	10.80.3.29 – 10.80.3.29	10.80.3.29
31	10.80.3.30/32	10.80.3.30 – 10.80.3.30	10.80.3.30
32	10.80.3.31/32	10.80.3.31 – 10.80.3.31	10.80.3.31
33	10.80.3.32/32	10.80.3.32 – 10.80.3.32	10.80.3.32
34	10.80.3.33/32	10.80.3.33 – 10.80.3.33	10.80.3.33
35	10.80.3.34/32	10.80.3.34 – 10.80.3.34	10.80.3.34
36	10.80.3.35/32	10.80.3.35 – 10.80.3.35	10.80.3.35
37	10.80.3.36/32	10.80.3.36 – 10.80.3.36	10.80.3.36
38	10.80.3.37/32	10.80.3.37 – 10.80.3.37	10.80.3.37
39	10.80.3.38/32	10.80.3.38 – 10.80.3.38	10.80.3.38
40	10.80.3.39/32	10.80.3.39 – 10.80.3.39	10.80.3.39
41	10.80.3.40/32	10.80.3.40 – 10.80.3.40	10.80.3.40
42	10.80.3.41/32	10.80.3.41 – 10.80.3.41	10.80.3.41
43	10.80.3.42/32	10.80.3.42 – 10.80.3.42	10.80.3.42
44	10.80.3.43/32	10.80.3.43 – 10.80.3.43	10.80.3.43
45	10.80.3.44/32	10.80.3.44 – 10.80.3.44	10.80.3.44
46	10.80.3.45/32	10.80.3.45 – 10.80.3.45	10.80.3.45
47	10.80.3.46/32	10.80.3.46 – 10.80.3.46	10.80.3.46
48	10.80.3.47/32	10.80.3.47 – 10.80.3.47	10.80.3.47
49	10.80.3.48/32	10.80.3.48 – 10.80.3.48	10.80.3.48
50	10.80.3.49/32	10.80.3.49 – 10.80.3.49	10.80.3.49
51	10.80.3.50/32	10.80.3.50 – 10.80.3.50	10.80.3.50
52	10.80.3.51/32	10.80.3.51 – 10.80.3.51	10.80.3.51
53	10.80.3.52/32	10.80.3.52 – 10.80.3.52	10.80.3.52
54	10.80.3.53/32	10.80.3.53 – 10.80.3.53	10.80.3.53
55	10.80.3.54/32	10.80.3.54 – 10.80.3.54	10.80.3.54
56	10.80.3.55/32	10.80.3.55 – 10.80.3.55	10.80.3.55
57	10.80.3.56/32	10.80.3.56 – 10.80.3.56	10.80.3.56
58	10.80.3.57/32	10.80.3.57 – 10.80.3.57	10.80.3.57
59	10.80.3.58/32	10.80.3.58 – 10.80.3.58	10.80.3.58
60	10.80.3.59/32	10.80.3.59 – 10.80.3.59	10.80.3.59
61	10.80.3.60/32	10.80.3.60 – 10.80.3.60	10.80.3.60
62	10.80.3.61/32	10.80.3.61 – 10.80.3.61	10.80.3.61
63	10.80.3.62/32	10.80.3.62 – 10.80.3.62	10.80.3.62
64	10.80.3.63/32	10.80.3.63 – 10.80.3.63	10.80.3.63
65	10.80.3.64/32	10.80.3.64 – 10.80.3.64	10.80.3.64
66	10.80.3.65/32	10.80.3.65 – 10.80.3.65	10.80.3.65
67	10.80.3.66/32	10.80.3.66 – 10.80.3.66	10.80.3.66
68	10.80.3.67/32	10.80.3.67 – 10.80.3.67	10.80.3.67
69	10.80.3.68/32	10.80.3.68 – 10.80.3.68	10.80.3.68
70	10.80.3.69/32	10.80.3.69 – 10.80.3.69	10.80.3.69
71	10.80.3.70/32	10.80.3.70 – 10.80.3.70	10.80.3.70
72	10.80.3.71/32	10.80.3.71 – 10.80.3.71	10.80.3.71
73	10.80.3.72/32	10.80.3.72 – 10.80.3.72	10.80.3.72
74	10.80.3.73/32	10.80.3.73 – 10.80.3.73	10.80.3.73
75	10.80.3.74/32	10.80.3.74 – 10.80.3.74	10.80.3.74
76	10.80.3.75/32	10.80.3.75 – 10.80.3.75	10.80.3.75
77	10.80.3.76/32	10.80.3.76 – 10.80.3.76	10.80.3.76
78	10.80.3.77/32	10.80.3.77 – 10.80.3.77	10.80.3.77
79	10.80.3.78/32	10.80.3.78 – 10.80.3.78	10.80.3.78
80	10.80.3.79/32	10.80.3.79 – 10.80.3.79	10.80.3.79
81	10.80.3.80/32	10.80.3.80 – 10.80.3.80	10.80.3.80
82	10.80.3.81/32	10.80.3.81 – 10.80.3.81	10.80.3.81
83	10.80.3.82/32	10.80.3.82 – 10.80.3.82	10.80.3.82
84	10.80.3.83/32	10.80.3.83 – 10.80.3.83	10.80.3.83
85	10.80.3.84/32	10.80.3.84 – 10.80.3.84	10.80.3.84
86	10.80.3.85/32	10.80.3.85 – 10.80.3.85	10.80.3.85
87	10.80.3.86/32	10.80.3.86 – 10.80.3.86	10.80.3.86
88	10.80.3.87/32	10.80.3.87 – 10.80.3.87	10.80.3.87
89	10.80.3.88/32	10.80.3.88 – 10.80.3.88	10.80.3.88
90	10.80.3.89/32	10.80.3.89 – 10.80.3.89	10.80.3.89
91	10.80.3.90/32	10.80.3.90 – 10.80.3.90	10.80.3.90
92	10.80.3.91/32	10.80.3.91 – 10.80.3.91	10.80.3.91
93	10.80.3.92/32	10.80.3.92 – 10.80.3.92	10.80.3.92
94	10.80.3.93/32	10.80.3.93 – 10.80.3.93	10.80.3.93
95	10.80.3.94/32	10.80.3.94 – 10.80.3.94	10.80.3.94
96	10.80.3.95/32	10.80.3.95 – 10.80.3.95	10.80.3.95
97	10.80.3.96/32	10.80.3.96 – 10.80.3.96	10.80.3.96
98	10.80.3.97/32	10.80.3.97 – 10.80.3.97	10.80.3.97
99	10.80.3.98/32	10.80.3.98 – 10.80.3.98	10.80.3.98
100	10.80.3.99/32	10.80.3.99 – 10.80.3.99	10.80.3.99
101	10.80.3.100/32	10.80.3.100 – 10.80.3.100	10.80.3.100
102	10.80.3.101/32	10.80.3.101 – 10.80.3.101	10.80.3.101
103	10.80.3.102/32	10.80.3.102 – 10.80.3.102	10.80.3.102
104	10.80.3.103/32	10.80.3.103 – 10.80.3.103	10.80.3.103
105	10.80.3.104/32	10.80.3.104 – 10.80.3.104	10.80.3.104
106	10.80.3.105/32	10.80.3.105 – 10.80.3.105	10.80.3.105
107	10.80.3.106/32	10.80.3.106 – 10.80.3.106	10.80.3.106
108	10.80.3.107/32	10.80.3.107 – 10.80.3.107	10.80.3.107
109	10.80.3.108/32	10.80.3.108 – 10.80.3.108	10.80.3.108
110	10.80.3.109/32	10.80.3.109 – 10.80.3.109	10.80.3.109
111	10.80.3.110/32	10.80.3.110 – 10.80.3.110	10.80.3.110
112	10.80.3.111/32	10.80.3.111 – 10.80.3.111	10.80.3.111
113	10.80.3.112/32	10.80.3.112 – 10.80.3.112	10.80.3.112
114	10.80.3.113/32	10.80.3.113 – 10.80.3.113	10.80.3.113
115	10.80.3.114/32	10.80.3.114 – 10.80.3.114	10.80.3.114
116	10.80.3.115/32	10.80.3.115 – 10.80.3.115	10.80.3.115
117	10.80.3.116/32	10.80.3.116 – 10.80.3.116	10.80.3.116
118	10.80.3.117/32	10.80.3.117 – 10.80.3.117	10.80.3.117
119	10.80.3.118/32	10.80.3.118 – 10.80.3.118	10.80.3.118
120	10.80.3.119/32	10.80.3.119 – 10.80.3.119	10.80.3.119
121	10.80.3.120/32	10.80.3.120 – 10.80.3.120	10.80.3.120
122	10.80.3.121/32	10.80.3.121 – 10.80.3.121	10.80.3.121
123	10.80.3.122/32	10.80.3.122 – 10.80.3.122	10.80.3.122
124	10.80.3.123/32	10.80.3.123 – 10.80.3.123	10.80.3.123
125	10.80.3.124/32	10.80.3.124 – 10.80.3.124	10.80.3.124
126	10.80.3.125/32	10.80.3.125 – 10.80.3.125	10.80.3.125
127	10.80.3.126/32	10.80.3.126 – 10.80.3.126	10.80.3.126
128	10.80.3.127/32	10.80.3.127 – 10.80.3.127	10.80.3.127

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 →