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)10.3.150.0/25

network10.3.150.0/25

broadcast10.3.150.127

first host10.3.150.1

last host10.3.150.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.3.150.0/25

address00001010.00000011.10010110.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000011.10010110.00000000

broadcast00001010.00000011.10010110.01111111

green = network part, grey = host part

hex0x0a039600

decimal168007168

reverse dns0.150.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:9600

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.150.0/32	10.3.150.0 – 10.3.150.0	10.3.150.0
2	10.3.150.1/32	10.3.150.1 – 10.3.150.1	10.3.150.1
3	10.3.150.2/32	10.3.150.2 – 10.3.150.2	10.3.150.2
4	10.3.150.3/32	10.3.150.3 – 10.3.150.3	10.3.150.3
5	10.3.150.4/32	10.3.150.4 – 10.3.150.4	10.3.150.4
6	10.3.150.5/32	10.3.150.5 – 10.3.150.5	10.3.150.5
7	10.3.150.6/32	10.3.150.6 – 10.3.150.6	10.3.150.6
8	10.3.150.7/32	10.3.150.7 – 10.3.150.7	10.3.150.7
9	10.3.150.8/32	10.3.150.8 – 10.3.150.8	10.3.150.8
10	10.3.150.9/32	10.3.150.9 – 10.3.150.9	10.3.150.9
11	10.3.150.10/32	10.3.150.10 – 10.3.150.10	10.3.150.10
12	10.3.150.11/32	10.3.150.11 – 10.3.150.11	10.3.150.11
13	10.3.150.12/32	10.3.150.12 – 10.3.150.12	10.3.150.12
14	10.3.150.13/32	10.3.150.13 – 10.3.150.13	10.3.150.13
15	10.3.150.14/32	10.3.150.14 – 10.3.150.14	10.3.150.14
16	10.3.150.15/32	10.3.150.15 – 10.3.150.15	10.3.150.15
17	10.3.150.16/32	10.3.150.16 – 10.3.150.16	10.3.150.16
18	10.3.150.17/32	10.3.150.17 – 10.3.150.17	10.3.150.17
19	10.3.150.18/32	10.3.150.18 – 10.3.150.18	10.3.150.18
20	10.3.150.19/32	10.3.150.19 – 10.3.150.19	10.3.150.19
21	10.3.150.20/32	10.3.150.20 – 10.3.150.20	10.3.150.20
22	10.3.150.21/32	10.3.150.21 – 10.3.150.21	10.3.150.21
23	10.3.150.22/32	10.3.150.22 – 10.3.150.22	10.3.150.22
24	10.3.150.23/32	10.3.150.23 – 10.3.150.23	10.3.150.23
25	10.3.150.24/32	10.3.150.24 – 10.3.150.24	10.3.150.24
26	10.3.150.25/32	10.3.150.25 – 10.3.150.25	10.3.150.25
27	10.3.150.26/32	10.3.150.26 – 10.3.150.26	10.3.150.26
28	10.3.150.27/32	10.3.150.27 – 10.3.150.27	10.3.150.27
29	10.3.150.28/32	10.3.150.28 – 10.3.150.28	10.3.150.28
30	10.3.150.29/32	10.3.150.29 – 10.3.150.29	10.3.150.29
31	10.3.150.30/32	10.3.150.30 – 10.3.150.30	10.3.150.30
32	10.3.150.31/32	10.3.150.31 – 10.3.150.31	10.3.150.31
33	10.3.150.32/32	10.3.150.32 – 10.3.150.32	10.3.150.32
34	10.3.150.33/32	10.3.150.33 – 10.3.150.33	10.3.150.33
35	10.3.150.34/32	10.3.150.34 – 10.3.150.34	10.3.150.34
36	10.3.150.35/32	10.3.150.35 – 10.3.150.35	10.3.150.35
37	10.3.150.36/32	10.3.150.36 – 10.3.150.36	10.3.150.36
38	10.3.150.37/32	10.3.150.37 – 10.3.150.37	10.3.150.37
39	10.3.150.38/32	10.3.150.38 – 10.3.150.38	10.3.150.38
40	10.3.150.39/32	10.3.150.39 – 10.3.150.39	10.3.150.39
41	10.3.150.40/32	10.3.150.40 – 10.3.150.40	10.3.150.40
42	10.3.150.41/32	10.3.150.41 – 10.3.150.41	10.3.150.41
43	10.3.150.42/32	10.3.150.42 – 10.3.150.42	10.3.150.42
44	10.3.150.43/32	10.3.150.43 – 10.3.150.43	10.3.150.43
45	10.3.150.44/32	10.3.150.44 – 10.3.150.44	10.3.150.44
46	10.3.150.45/32	10.3.150.45 – 10.3.150.45	10.3.150.45
47	10.3.150.46/32	10.3.150.46 – 10.3.150.46	10.3.150.46
48	10.3.150.47/32	10.3.150.47 – 10.3.150.47	10.3.150.47
49	10.3.150.48/32	10.3.150.48 – 10.3.150.48	10.3.150.48
50	10.3.150.49/32	10.3.150.49 – 10.3.150.49	10.3.150.49
51	10.3.150.50/32	10.3.150.50 – 10.3.150.50	10.3.150.50
52	10.3.150.51/32	10.3.150.51 – 10.3.150.51	10.3.150.51
53	10.3.150.52/32	10.3.150.52 – 10.3.150.52	10.3.150.52
54	10.3.150.53/32	10.3.150.53 – 10.3.150.53	10.3.150.53
55	10.3.150.54/32	10.3.150.54 – 10.3.150.54	10.3.150.54
56	10.3.150.55/32	10.3.150.55 – 10.3.150.55	10.3.150.55
57	10.3.150.56/32	10.3.150.56 – 10.3.150.56	10.3.150.56
58	10.3.150.57/32	10.3.150.57 – 10.3.150.57	10.3.150.57
59	10.3.150.58/32	10.3.150.58 – 10.3.150.58	10.3.150.58
60	10.3.150.59/32	10.3.150.59 – 10.3.150.59	10.3.150.59
61	10.3.150.60/32	10.3.150.60 – 10.3.150.60	10.3.150.60
62	10.3.150.61/32	10.3.150.61 – 10.3.150.61	10.3.150.61
63	10.3.150.62/32	10.3.150.62 – 10.3.150.62	10.3.150.62
64	10.3.150.63/32	10.3.150.63 – 10.3.150.63	10.3.150.63
65	10.3.150.64/32	10.3.150.64 – 10.3.150.64	10.3.150.64
66	10.3.150.65/32	10.3.150.65 – 10.3.150.65	10.3.150.65
67	10.3.150.66/32	10.3.150.66 – 10.3.150.66	10.3.150.66
68	10.3.150.67/32	10.3.150.67 – 10.3.150.67	10.3.150.67
69	10.3.150.68/32	10.3.150.68 – 10.3.150.68	10.3.150.68
70	10.3.150.69/32	10.3.150.69 – 10.3.150.69	10.3.150.69
71	10.3.150.70/32	10.3.150.70 – 10.3.150.70	10.3.150.70
72	10.3.150.71/32	10.3.150.71 – 10.3.150.71	10.3.150.71
73	10.3.150.72/32	10.3.150.72 – 10.3.150.72	10.3.150.72
74	10.3.150.73/32	10.3.150.73 – 10.3.150.73	10.3.150.73
75	10.3.150.74/32	10.3.150.74 – 10.3.150.74	10.3.150.74
76	10.3.150.75/32	10.3.150.75 – 10.3.150.75	10.3.150.75
77	10.3.150.76/32	10.3.150.76 – 10.3.150.76	10.3.150.76
78	10.3.150.77/32	10.3.150.77 – 10.3.150.77	10.3.150.77
79	10.3.150.78/32	10.3.150.78 – 10.3.150.78	10.3.150.78
80	10.3.150.79/32	10.3.150.79 – 10.3.150.79	10.3.150.79
81	10.3.150.80/32	10.3.150.80 – 10.3.150.80	10.3.150.80
82	10.3.150.81/32	10.3.150.81 – 10.3.150.81	10.3.150.81
83	10.3.150.82/32	10.3.150.82 – 10.3.150.82	10.3.150.82
84	10.3.150.83/32	10.3.150.83 – 10.3.150.83	10.3.150.83
85	10.3.150.84/32	10.3.150.84 – 10.3.150.84	10.3.150.84
86	10.3.150.85/32	10.3.150.85 – 10.3.150.85	10.3.150.85
87	10.3.150.86/32	10.3.150.86 – 10.3.150.86	10.3.150.86
88	10.3.150.87/32	10.3.150.87 – 10.3.150.87	10.3.150.87
89	10.3.150.88/32	10.3.150.88 – 10.3.150.88	10.3.150.88
90	10.3.150.89/32	10.3.150.89 – 10.3.150.89	10.3.150.89
91	10.3.150.90/32	10.3.150.90 – 10.3.150.90	10.3.150.90
92	10.3.150.91/32	10.3.150.91 – 10.3.150.91	10.3.150.91
93	10.3.150.92/32	10.3.150.92 – 10.3.150.92	10.3.150.92
94	10.3.150.93/32	10.3.150.93 – 10.3.150.93	10.3.150.93
95	10.3.150.94/32	10.3.150.94 – 10.3.150.94	10.3.150.94
96	10.3.150.95/32	10.3.150.95 – 10.3.150.95	10.3.150.95
97	10.3.150.96/32	10.3.150.96 – 10.3.150.96	10.3.150.96
98	10.3.150.97/32	10.3.150.97 – 10.3.150.97	10.3.150.97
99	10.3.150.98/32	10.3.150.98 – 10.3.150.98	10.3.150.98
100	10.3.150.99/32	10.3.150.99 – 10.3.150.99	10.3.150.99
101	10.3.150.100/32	10.3.150.100 – 10.3.150.100	10.3.150.100
102	10.3.150.101/32	10.3.150.101 – 10.3.150.101	10.3.150.101
103	10.3.150.102/32	10.3.150.102 – 10.3.150.102	10.3.150.102
104	10.3.150.103/32	10.3.150.103 – 10.3.150.103	10.3.150.103
105	10.3.150.104/32	10.3.150.104 – 10.3.150.104	10.3.150.104
106	10.3.150.105/32	10.3.150.105 – 10.3.150.105	10.3.150.105
107	10.3.150.106/32	10.3.150.106 – 10.3.150.106	10.3.150.106
108	10.3.150.107/32	10.3.150.107 – 10.3.150.107	10.3.150.107
109	10.3.150.108/32	10.3.150.108 – 10.3.150.108	10.3.150.108
110	10.3.150.109/32	10.3.150.109 – 10.3.150.109	10.3.150.109
111	10.3.150.110/32	10.3.150.110 – 10.3.150.110	10.3.150.110
112	10.3.150.111/32	10.3.150.111 – 10.3.150.111	10.3.150.111
113	10.3.150.112/32	10.3.150.112 – 10.3.150.112	10.3.150.112
114	10.3.150.113/32	10.3.150.113 – 10.3.150.113	10.3.150.113
115	10.3.150.114/32	10.3.150.114 – 10.3.150.114	10.3.150.114
116	10.3.150.115/32	10.3.150.115 – 10.3.150.115	10.3.150.115
117	10.3.150.116/32	10.3.150.116 – 10.3.150.116	10.3.150.116
118	10.3.150.117/32	10.3.150.117 – 10.3.150.117	10.3.150.117
119	10.3.150.118/32	10.3.150.118 – 10.3.150.118	10.3.150.118
120	10.3.150.119/32	10.3.150.119 – 10.3.150.119	10.3.150.119
121	10.3.150.120/32	10.3.150.120 – 10.3.150.120	10.3.150.120
122	10.3.150.121/32	10.3.150.121 – 10.3.150.121	10.3.150.121
123	10.3.150.122/32	10.3.150.122 – 10.3.150.122	10.3.150.122
124	10.3.150.123/32	10.3.150.123 – 10.3.150.123	10.3.150.123
125	10.3.150.124/32	10.3.150.124 – 10.3.150.124	10.3.150.124
126	10.3.150.125/32	10.3.150.125 – 10.3.150.125	10.3.150.125
127	10.3.150.126/32	10.3.150.126 – 10.3.150.126	10.3.150.126
128	10.3.150.127/32	10.3.150.127 – 10.3.150.127	10.3.150.127

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 →