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)10.2.143.0/25

network10.2.143.0/25

broadcast10.2.143.127

first host10.2.143.1

last host10.2.143.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.143.0/25

address00001010.00000010.10001111.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.10001111.00000000

broadcast00001010.00000010.10001111.01111111

green = network part, grey = host part

hex0x0a028f00

decimal167939840

reverse dns0.143.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:8f00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.143.0/32	10.2.143.0 – 10.2.143.0	10.2.143.0
2	10.2.143.1/32	10.2.143.1 – 10.2.143.1	10.2.143.1
3	10.2.143.2/32	10.2.143.2 – 10.2.143.2	10.2.143.2
4	10.2.143.3/32	10.2.143.3 – 10.2.143.3	10.2.143.3
5	10.2.143.4/32	10.2.143.4 – 10.2.143.4	10.2.143.4
6	10.2.143.5/32	10.2.143.5 – 10.2.143.5	10.2.143.5
7	10.2.143.6/32	10.2.143.6 – 10.2.143.6	10.2.143.6
8	10.2.143.7/32	10.2.143.7 – 10.2.143.7	10.2.143.7
9	10.2.143.8/32	10.2.143.8 – 10.2.143.8	10.2.143.8
10	10.2.143.9/32	10.2.143.9 – 10.2.143.9	10.2.143.9
11	10.2.143.10/32	10.2.143.10 – 10.2.143.10	10.2.143.10
12	10.2.143.11/32	10.2.143.11 – 10.2.143.11	10.2.143.11
13	10.2.143.12/32	10.2.143.12 – 10.2.143.12	10.2.143.12
14	10.2.143.13/32	10.2.143.13 – 10.2.143.13	10.2.143.13
15	10.2.143.14/32	10.2.143.14 – 10.2.143.14	10.2.143.14
16	10.2.143.15/32	10.2.143.15 – 10.2.143.15	10.2.143.15
17	10.2.143.16/32	10.2.143.16 – 10.2.143.16	10.2.143.16
18	10.2.143.17/32	10.2.143.17 – 10.2.143.17	10.2.143.17
19	10.2.143.18/32	10.2.143.18 – 10.2.143.18	10.2.143.18
20	10.2.143.19/32	10.2.143.19 – 10.2.143.19	10.2.143.19
21	10.2.143.20/32	10.2.143.20 – 10.2.143.20	10.2.143.20
22	10.2.143.21/32	10.2.143.21 – 10.2.143.21	10.2.143.21
23	10.2.143.22/32	10.2.143.22 – 10.2.143.22	10.2.143.22
24	10.2.143.23/32	10.2.143.23 – 10.2.143.23	10.2.143.23
25	10.2.143.24/32	10.2.143.24 – 10.2.143.24	10.2.143.24
26	10.2.143.25/32	10.2.143.25 – 10.2.143.25	10.2.143.25
27	10.2.143.26/32	10.2.143.26 – 10.2.143.26	10.2.143.26
28	10.2.143.27/32	10.2.143.27 – 10.2.143.27	10.2.143.27
29	10.2.143.28/32	10.2.143.28 – 10.2.143.28	10.2.143.28
30	10.2.143.29/32	10.2.143.29 – 10.2.143.29	10.2.143.29
31	10.2.143.30/32	10.2.143.30 – 10.2.143.30	10.2.143.30
32	10.2.143.31/32	10.2.143.31 – 10.2.143.31	10.2.143.31
33	10.2.143.32/32	10.2.143.32 – 10.2.143.32	10.2.143.32
34	10.2.143.33/32	10.2.143.33 – 10.2.143.33	10.2.143.33
35	10.2.143.34/32	10.2.143.34 – 10.2.143.34	10.2.143.34
36	10.2.143.35/32	10.2.143.35 – 10.2.143.35	10.2.143.35
37	10.2.143.36/32	10.2.143.36 – 10.2.143.36	10.2.143.36
38	10.2.143.37/32	10.2.143.37 – 10.2.143.37	10.2.143.37
39	10.2.143.38/32	10.2.143.38 – 10.2.143.38	10.2.143.38
40	10.2.143.39/32	10.2.143.39 – 10.2.143.39	10.2.143.39
41	10.2.143.40/32	10.2.143.40 – 10.2.143.40	10.2.143.40
42	10.2.143.41/32	10.2.143.41 – 10.2.143.41	10.2.143.41
43	10.2.143.42/32	10.2.143.42 – 10.2.143.42	10.2.143.42
44	10.2.143.43/32	10.2.143.43 – 10.2.143.43	10.2.143.43
45	10.2.143.44/32	10.2.143.44 – 10.2.143.44	10.2.143.44
46	10.2.143.45/32	10.2.143.45 – 10.2.143.45	10.2.143.45
47	10.2.143.46/32	10.2.143.46 – 10.2.143.46	10.2.143.46
48	10.2.143.47/32	10.2.143.47 – 10.2.143.47	10.2.143.47
49	10.2.143.48/32	10.2.143.48 – 10.2.143.48	10.2.143.48
50	10.2.143.49/32	10.2.143.49 – 10.2.143.49	10.2.143.49
51	10.2.143.50/32	10.2.143.50 – 10.2.143.50	10.2.143.50
52	10.2.143.51/32	10.2.143.51 – 10.2.143.51	10.2.143.51
53	10.2.143.52/32	10.2.143.52 – 10.2.143.52	10.2.143.52
54	10.2.143.53/32	10.2.143.53 – 10.2.143.53	10.2.143.53
55	10.2.143.54/32	10.2.143.54 – 10.2.143.54	10.2.143.54
56	10.2.143.55/32	10.2.143.55 – 10.2.143.55	10.2.143.55
57	10.2.143.56/32	10.2.143.56 – 10.2.143.56	10.2.143.56
58	10.2.143.57/32	10.2.143.57 – 10.2.143.57	10.2.143.57
59	10.2.143.58/32	10.2.143.58 – 10.2.143.58	10.2.143.58
60	10.2.143.59/32	10.2.143.59 – 10.2.143.59	10.2.143.59
61	10.2.143.60/32	10.2.143.60 – 10.2.143.60	10.2.143.60
62	10.2.143.61/32	10.2.143.61 – 10.2.143.61	10.2.143.61
63	10.2.143.62/32	10.2.143.62 – 10.2.143.62	10.2.143.62
64	10.2.143.63/32	10.2.143.63 – 10.2.143.63	10.2.143.63
65	10.2.143.64/32	10.2.143.64 – 10.2.143.64	10.2.143.64
66	10.2.143.65/32	10.2.143.65 – 10.2.143.65	10.2.143.65
67	10.2.143.66/32	10.2.143.66 – 10.2.143.66	10.2.143.66
68	10.2.143.67/32	10.2.143.67 – 10.2.143.67	10.2.143.67
69	10.2.143.68/32	10.2.143.68 – 10.2.143.68	10.2.143.68
70	10.2.143.69/32	10.2.143.69 – 10.2.143.69	10.2.143.69
71	10.2.143.70/32	10.2.143.70 – 10.2.143.70	10.2.143.70
72	10.2.143.71/32	10.2.143.71 – 10.2.143.71	10.2.143.71
73	10.2.143.72/32	10.2.143.72 – 10.2.143.72	10.2.143.72
74	10.2.143.73/32	10.2.143.73 – 10.2.143.73	10.2.143.73
75	10.2.143.74/32	10.2.143.74 – 10.2.143.74	10.2.143.74
76	10.2.143.75/32	10.2.143.75 – 10.2.143.75	10.2.143.75
77	10.2.143.76/32	10.2.143.76 – 10.2.143.76	10.2.143.76
78	10.2.143.77/32	10.2.143.77 – 10.2.143.77	10.2.143.77
79	10.2.143.78/32	10.2.143.78 – 10.2.143.78	10.2.143.78
80	10.2.143.79/32	10.2.143.79 – 10.2.143.79	10.2.143.79
81	10.2.143.80/32	10.2.143.80 – 10.2.143.80	10.2.143.80
82	10.2.143.81/32	10.2.143.81 – 10.2.143.81	10.2.143.81
83	10.2.143.82/32	10.2.143.82 – 10.2.143.82	10.2.143.82
84	10.2.143.83/32	10.2.143.83 – 10.2.143.83	10.2.143.83
85	10.2.143.84/32	10.2.143.84 – 10.2.143.84	10.2.143.84
86	10.2.143.85/32	10.2.143.85 – 10.2.143.85	10.2.143.85
87	10.2.143.86/32	10.2.143.86 – 10.2.143.86	10.2.143.86
88	10.2.143.87/32	10.2.143.87 – 10.2.143.87	10.2.143.87
89	10.2.143.88/32	10.2.143.88 – 10.2.143.88	10.2.143.88
90	10.2.143.89/32	10.2.143.89 – 10.2.143.89	10.2.143.89
91	10.2.143.90/32	10.2.143.90 – 10.2.143.90	10.2.143.90
92	10.2.143.91/32	10.2.143.91 – 10.2.143.91	10.2.143.91
93	10.2.143.92/32	10.2.143.92 – 10.2.143.92	10.2.143.92
94	10.2.143.93/32	10.2.143.93 – 10.2.143.93	10.2.143.93
95	10.2.143.94/32	10.2.143.94 – 10.2.143.94	10.2.143.94
96	10.2.143.95/32	10.2.143.95 – 10.2.143.95	10.2.143.95
97	10.2.143.96/32	10.2.143.96 – 10.2.143.96	10.2.143.96
98	10.2.143.97/32	10.2.143.97 – 10.2.143.97	10.2.143.97
99	10.2.143.98/32	10.2.143.98 – 10.2.143.98	10.2.143.98
100	10.2.143.99/32	10.2.143.99 – 10.2.143.99	10.2.143.99
101	10.2.143.100/32	10.2.143.100 – 10.2.143.100	10.2.143.100
102	10.2.143.101/32	10.2.143.101 – 10.2.143.101	10.2.143.101
103	10.2.143.102/32	10.2.143.102 – 10.2.143.102	10.2.143.102
104	10.2.143.103/32	10.2.143.103 – 10.2.143.103	10.2.143.103
105	10.2.143.104/32	10.2.143.104 – 10.2.143.104	10.2.143.104
106	10.2.143.105/32	10.2.143.105 – 10.2.143.105	10.2.143.105
107	10.2.143.106/32	10.2.143.106 – 10.2.143.106	10.2.143.106
108	10.2.143.107/32	10.2.143.107 – 10.2.143.107	10.2.143.107
109	10.2.143.108/32	10.2.143.108 – 10.2.143.108	10.2.143.108
110	10.2.143.109/32	10.2.143.109 – 10.2.143.109	10.2.143.109
111	10.2.143.110/32	10.2.143.110 – 10.2.143.110	10.2.143.110
112	10.2.143.111/32	10.2.143.111 – 10.2.143.111	10.2.143.111
113	10.2.143.112/32	10.2.143.112 – 10.2.143.112	10.2.143.112
114	10.2.143.113/32	10.2.143.113 – 10.2.143.113	10.2.143.113
115	10.2.143.114/32	10.2.143.114 – 10.2.143.114	10.2.143.114
116	10.2.143.115/32	10.2.143.115 – 10.2.143.115	10.2.143.115
117	10.2.143.116/32	10.2.143.116 – 10.2.143.116	10.2.143.116
118	10.2.143.117/32	10.2.143.117 – 10.2.143.117	10.2.143.117
119	10.2.143.118/32	10.2.143.118 – 10.2.143.118	10.2.143.118
120	10.2.143.119/32	10.2.143.119 – 10.2.143.119	10.2.143.119
121	10.2.143.120/32	10.2.143.120 – 10.2.143.120	10.2.143.120
122	10.2.143.121/32	10.2.143.121 – 10.2.143.121	10.2.143.121
123	10.2.143.122/32	10.2.143.122 – 10.2.143.122	10.2.143.122
124	10.2.143.123/32	10.2.143.123 – 10.2.143.123	10.2.143.123
125	10.2.143.124/32	10.2.143.124 – 10.2.143.124	10.2.143.124
126	10.2.143.125/32	10.2.143.125 – 10.2.143.125	10.2.143.125
127	10.2.143.126/32	10.2.143.126 – 10.2.143.126	10.2.143.126
128	10.2.143.127/32	10.2.143.127 – 10.2.143.127	10.2.143.127

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 →