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)10.3.185.0/25

network10.3.185.0/25

broadcast10.3.185.127

first host10.3.185.1

last host10.3.185.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.3.185.0/25

address00001010.00000011.10111001.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000011.10111001.00000000

broadcast00001010.00000011.10111001.01111111

green = network part, grey = host part

hex0x0a03b900

decimal168016128

reverse dns0.185.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:b900

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.185.0/32	10.3.185.0 – 10.3.185.0	10.3.185.0
2	10.3.185.1/32	10.3.185.1 – 10.3.185.1	10.3.185.1
3	10.3.185.2/32	10.3.185.2 – 10.3.185.2	10.3.185.2
4	10.3.185.3/32	10.3.185.3 – 10.3.185.3	10.3.185.3
5	10.3.185.4/32	10.3.185.4 – 10.3.185.4	10.3.185.4
6	10.3.185.5/32	10.3.185.5 – 10.3.185.5	10.3.185.5
7	10.3.185.6/32	10.3.185.6 – 10.3.185.6	10.3.185.6
8	10.3.185.7/32	10.3.185.7 – 10.3.185.7	10.3.185.7
9	10.3.185.8/32	10.3.185.8 – 10.3.185.8	10.3.185.8
10	10.3.185.9/32	10.3.185.9 – 10.3.185.9	10.3.185.9
11	10.3.185.10/32	10.3.185.10 – 10.3.185.10	10.3.185.10
12	10.3.185.11/32	10.3.185.11 – 10.3.185.11	10.3.185.11
13	10.3.185.12/32	10.3.185.12 – 10.3.185.12	10.3.185.12
14	10.3.185.13/32	10.3.185.13 – 10.3.185.13	10.3.185.13
15	10.3.185.14/32	10.3.185.14 – 10.3.185.14	10.3.185.14
16	10.3.185.15/32	10.3.185.15 – 10.3.185.15	10.3.185.15
17	10.3.185.16/32	10.3.185.16 – 10.3.185.16	10.3.185.16
18	10.3.185.17/32	10.3.185.17 – 10.3.185.17	10.3.185.17
19	10.3.185.18/32	10.3.185.18 – 10.3.185.18	10.3.185.18
20	10.3.185.19/32	10.3.185.19 – 10.3.185.19	10.3.185.19
21	10.3.185.20/32	10.3.185.20 – 10.3.185.20	10.3.185.20
22	10.3.185.21/32	10.3.185.21 – 10.3.185.21	10.3.185.21
23	10.3.185.22/32	10.3.185.22 – 10.3.185.22	10.3.185.22
24	10.3.185.23/32	10.3.185.23 – 10.3.185.23	10.3.185.23
25	10.3.185.24/32	10.3.185.24 – 10.3.185.24	10.3.185.24
26	10.3.185.25/32	10.3.185.25 – 10.3.185.25	10.3.185.25
27	10.3.185.26/32	10.3.185.26 – 10.3.185.26	10.3.185.26
28	10.3.185.27/32	10.3.185.27 – 10.3.185.27	10.3.185.27
29	10.3.185.28/32	10.3.185.28 – 10.3.185.28	10.3.185.28
30	10.3.185.29/32	10.3.185.29 – 10.3.185.29	10.3.185.29
31	10.3.185.30/32	10.3.185.30 – 10.3.185.30	10.3.185.30
32	10.3.185.31/32	10.3.185.31 – 10.3.185.31	10.3.185.31
33	10.3.185.32/32	10.3.185.32 – 10.3.185.32	10.3.185.32
34	10.3.185.33/32	10.3.185.33 – 10.3.185.33	10.3.185.33
35	10.3.185.34/32	10.3.185.34 – 10.3.185.34	10.3.185.34
36	10.3.185.35/32	10.3.185.35 – 10.3.185.35	10.3.185.35
37	10.3.185.36/32	10.3.185.36 – 10.3.185.36	10.3.185.36
38	10.3.185.37/32	10.3.185.37 – 10.3.185.37	10.3.185.37
39	10.3.185.38/32	10.3.185.38 – 10.3.185.38	10.3.185.38
40	10.3.185.39/32	10.3.185.39 – 10.3.185.39	10.3.185.39
41	10.3.185.40/32	10.3.185.40 – 10.3.185.40	10.3.185.40
42	10.3.185.41/32	10.3.185.41 – 10.3.185.41	10.3.185.41
43	10.3.185.42/32	10.3.185.42 – 10.3.185.42	10.3.185.42
44	10.3.185.43/32	10.3.185.43 – 10.3.185.43	10.3.185.43
45	10.3.185.44/32	10.3.185.44 – 10.3.185.44	10.3.185.44
46	10.3.185.45/32	10.3.185.45 – 10.3.185.45	10.3.185.45
47	10.3.185.46/32	10.3.185.46 – 10.3.185.46	10.3.185.46
48	10.3.185.47/32	10.3.185.47 – 10.3.185.47	10.3.185.47
49	10.3.185.48/32	10.3.185.48 – 10.3.185.48	10.3.185.48
50	10.3.185.49/32	10.3.185.49 – 10.3.185.49	10.3.185.49
51	10.3.185.50/32	10.3.185.50 – 10.3.185.50	10.3.185.50
52	10.3.185.51/32	10.3.185.51 – 10.3.185.51	10.3.185.51
53	10.3.185.52/32	10.3.185.52 – 10.3.185.52	10.3.185.52
54	10.3.185.53/32	10.3.185.53 – 10.3.185.53	10.3.185.53
55	10.3.185.54/32	10.3.185.54 – 10.3.185.54	10.3.185.54
56	10.3.185.55/32	10.3.185.55 – 10.3.185.55	10.3.185.55
57	10.3.185.56/32	10.3.185.56 – 10.3.185.56	10.3.185.56
58	10.3.185.57/32	10.3.185.57 – 10.3.185.57	10.3.185.57
59	10.3.185.58/32	10.3.185.58 – 10.3.185.58	10.3.185.58
60	10.3.185.59/32	10.3.185.59 – 10.3.185.59	10.3.185.59
61	10.3.185.60/32	10.3.185.60 – 10.3.185.60	10.3.185.60
62	10.3.185.61/32	10.3.185.61 – 10.3.185.61	10.3.185.61
63	10.3.185.62/32	10.3.185.62 – 10.3.185.62	10.3.185.62
64	10.3.185.63/32	10.3.185.63 – 10.3.185.63	10.3.185.63
65	10.3.185.64/32	10.3.185.64 – 10.3.185.64	10.3.185.64
66	10.3.185.65/32	10.3.185.65 – 10.3.185.65	10.3.185.65
67	10.3.185.66/32	10.3.185.66 – 10.3.185.66	10.3.185.66
68	10.3.185.67/32	10.3.185.67 – 10.3.185.67	10.3.185.67
69	10.3.185.68/32	10.3.185.68 – 10.3.185.68	10.3.185.68
70	10.3.185.69/32	10.3.185.69 – 10.3.185.69	10.3.185.69
71	10.3.185.70/32	10.3.185.70 – 10.3.185.70	10.3.185.70
72	10.3.185.71/32	10.3.185.71 – 10.3.185.71	10.3.185.71
73	10.3.185.72/32	10.3.185.72 – 10.3.185.72	10.3.185.72
74	10.3.185.73/32	10.3.185.73 – 10.3.185.73	10.3.185.73
75	10.3.185.74/32	10.3.185.74 – 10.3.185.74	10.3.185.74
76	10.3.185.75/32	10.3.185.75 – 10.3.185.75	10.3.185.75
77	10.3.185.76/32	10.3.185.76 – 10.3.185.76	10.3.185.76
78	10.3.185.77/32	10.3.185.77 – 10.3.185.77	10.3.185.77
79	10.3.185.78/32	10.3.185.78 – 10.3.185.78	10.3.185.78
80	10.3.185.79/32	10.3.185.79 – 10.3.185.79	10.3.185.79
81	10.3.185.80/32	10.3.185.80 – 10.3.185.80	10.3.185.80
82	10.3.185.81/32	10.3.185.81 – 10.3.185.81	10.3.185.81
83	10.3.185.82/32	10.3.185.82 – 10.3.185.82	10.3.185.82
84	10.3.185.83/32	10.3.185.83 – 10.3.185.83	10.3.185.83
85	10.3.185.84/32	10.3.185.84 – 10.3.185.84	10.3.185.84
86	10.3.185.85/32	10.3.185.85 – 10.3.185.85	10.3.185.85
87	10.3.185.86/32	10.3.185.86 – 10.3.185.86	10.3.185.86
88	10.3.185.87/32	10.3.185.87 – 10.3.185.87	10.3.185.87
89	10.3.185.88/32	10.3.185.88 – 10.3.185.88	10.3.185.88
90	10.3.185.89/32	10.3.185.89 – 10.3.185.89	10.3.185.89
91	10.3.185.90/32	10.3.185.90 – 10.3.185.90	10.3.185.90
92	10.3.185.91/32	10.3.185.91 – 10.3.185.91	10.3.185.91
93	10.3.185.92/32	10.3.185.92 – 10.3.185.92	10.3.185.92
94	10.3.185.93/32	10.3.185.93 – 10.3.185.93	10.3.185.93
95	10.3.185.94/32	10.3.185.94 – 10.3.185.94	10.3.185.94
96	10.3.185.95/32	10.3.185.95 – 10.3.185.95	10.3.185.95
97	10.3.185.96/32	10.3.185.96 – 10.3.185.96	10.3.185.96
98	10.3.185.97/32	10.3.185.97 – 10.3.185.97	10.3.185.97
99	10.3.185.98/32	10.3.185.98 – 10.3.185.98	10.3.185.98
100	10.3.185.99/32	10.3.185.99 – 10.3.185.99	10.3.185.99
101	10.3.185.100/32	10.3.185.100 – 10.3.185.100	10.3.185.100
102	10.3.185.101/32	10.3.185.101 – 10.3.185.101	10.3.185.101
103	10.3.185.102/32	10.3.185.102 – 10.3.185.102	10.3.185.102
104	10.3.185.103/32	10.3.185.103 – 10.3.185.103	10.3.185.103
105	10.3.185.104/32	10.3.185.104 – 10.3.185.104	10.3.185.104
106	10.3.185.105/32	10.3.185.105 – 10.3.185.105	10.3.185.105
107	10.3.185.106/32	10.3.185.106 – 10.3.185.106	10.3.185.106
108	10.3.185.107/32	10.3.185.107 – 10.3.185.107	10.3.185.107
109	10.3.185.108/32	10.3.185.108 – 10.3.185.108	10.3.185.108
110	10.3.185.109/32	10.3.185.109 – 10.3.185.109	10.3.185.109
111	10.3.185.110/32	10.3.185.110 – 10.3.185.110	10.3.185.110
112	10.3.185.111/32	10.3.185.111 – 10.3.185.111	10.3.185.111
113	10.3.185.112/32	10.3.185.112 – 10.3.185.112	10.3.185.112
114	10.3.185.113/32	10.3.185.113 – 10.3.185.113	10.3.185.113
115	10.3.185.114/32	10.3.185.114 – 10.3.185.114	10.3.185.114
116	10.3.185.115/32	10.3.185.115 – 10.3.185.115	10.3.185.115
117	10.3.185.116/32	10.3.185.116 – 10.3.185.116	10.3.185.116
118	10.3.185.117/32	10.3.185.117 – 10.3.185.117	10.3.185.117
119	10.3.185.118/32	10.3.185.118 – 10.3.185.118	10.3.185.118
120	10.3.185.119/32	10.3.185.119 – 10.3.185.119	10.3.185.119
121	10.3.185.120/32	10.3.185.120 – 10.3.185.120	10.3.185.120
122	10.3.185.121/32	10.3.185.121 – 10.3.185.121	10.3.185.121
123	10.3.185.122/32	10.3.185.122 – 10.3.185.122	10.3.185.122
124	10.3.185.123/32	10.3.185.123 – 10.3.185.123	10.3.185.123
125	10.3.185.124/32	10.3.185.124 – 10.3.185.124	10.3.185.124
126	10.3.185.125/32	10.3.185.125 – 10.3.185.125	10.3.185.125
127	10.3.185.126/32	10.3.185.126 – 10.3.185.126	10.3.185.126
128	10.3.185.127/32	10.3.185.127 – 10.3.185.127	10.3.185.127

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 →