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)10.3.210.0/25

network10.3.210.0/25

broadcast10.3.210.127

first host10.3.210.1

last host10.3.210.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.3.210.0/25

address00001010.00000011.11010010.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000011.11010010.00000000

broadcast00001010.00000011.11010010.01111111

green = network part, grey = host part

hex0x0a03d200

decimal168022528

reverse dns0.210.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:d200

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.210.0/32	10.3.210.0 – 10.3.210.0	10.3.210.0
2	10.3.210.1/32	10.3.210.1 – 10.3.210.1	10.3.210.1
3	10.3.210.2/32	10.3.210.2 – 10.3.210.2	10.3.210.2
4	10.3.210.3/32	10.3.210.3 – 10.3.210.3	10.3.210.3
5	10.3.210.4/32	10.3.210.4 – 10.3.210.4	10.3.210.4
6	10.3.210.5/32	10.3.210.5 – 10.3.210.5	10.3.210.5
7	10.3.210.6/32	10.3.210.6 – 10.3.210.6	10.3.210.6
8	10.3.210.7/32	10.3.210.7 – 10.3.210.7	10.3.210.7
9	10.3.210.8/32	10.3.210.8 – 10.3.210.8	10.3.210.8
10	10.3.210.9/32	10.3.210.9 – 10.3.210.9	10.3.210.9
11	10.3.210.10/32	10.3.210.10 – 10.3.210.10	10.3.210.10
12	10.3.210.11/32	10.3.210.11 – 10.3.210.11	10.3.210.11
13	10.3.210.12/32	10.3.210.12 – 10.3.210.12	10.3.210.12
14	10.3.210.13/32	10.3.210.13 – 10.3.210.13	10.3.210.13
15	10.3.210.14/32	10.3.210.14 – 10.3.210.14	10.3.210.14
16	10.3.210.15/32	10.3.210.15 – 10.3.210.15	10.3.210.15
17	10.3.210.16/32	10.3.210.16 – 10.3.210.16	10.3.210.16
18	10.3.210.17/32	10.3.210.17 – 10.3.210.17	10.3.210.17
19	10.3.210.18/32	10.3.210.18 – 10.3.210.18	10.3.210.18
20	10.3.210.19/32	10.3.210.19 – 10.3.210.19	10.3.210.19
21	10.3.210.20/32	10.3.210.20 – 10.3.210.20	10.3.210.20
22	10.3.210.21/32	10.3.210.21 – 10.3.210.21	10.3.210.21
23	10.3.210.22/32	10.3.210.22 – 10.3.210.22	10.3.210.22
24	10.3.210.23/32	10.3.210.23 – 10.3.210.23	10.3.210.23
25	10.3.210.24/32	10.3.210.24 – 10.3.210.24	10.3.210.24
26	10.3.210.25/32	10.3.210.25 – 10.3.210.25	10.3.210.25
27	10.3.210.26/32	10.3.210.26 – 10.3.210.26	10.3.210.26
28	10.3.210.27/32	10.3.210.27 – 10.3.210.27	10.3.210.27
29	10.3.210.28/32	10.3.210.28 – 10.3.210.28	10.3.210.28
30	10.3.210.29/32	10.3.210.29 – 10.3.210.29	10.3.210.29
31	10.3.210.30/32	10.3.210.30 – 10.3.210.30	10.3.210.30
32	10.3.210.31/32	10.3.210.31 – 10.3.210.31	10.3.210.31
33	10.3.210.32/32	10.3.210.32 – 10.3.210.32	10.3.210.32
34	10.3.210.33/32	10.3.210.33 – 10.3.210.33	10.3.210.33
35	10.3.210.34/32	10.3.210.34 – 10.3.210.34	10.3.210.34
36	10.3.210.35/32	10.3.210.35 – 10.3.210.35	10.3.210.35
37	10.3.210.36/32	10.3.210.36 – 10.3.210.36	10.3.210.36
38	10.3.210.37/32	10.3.210.37 – 10.3.210.37	10.3.210.37
39	10.3.210.38/32	10.3.210.38 – 10.3.210.38	10.3.210.38
40	10.3.210.39/32	10.3.210.39 – 10.3.210.39	10.3.210.39
41	10.3.210.40/32	10.3.210.40 – 10.3.210.40	10.3.210.40
42	10.3.210.41/32	10.3.210.41 – 10.3.210.41	10.3.210.41
43	10.3.210.42/32	10.3.210.42 – 10.3.210.42	10.3.210.42
44	10.3.210.43/32	10.3.210.43 – 10.3.210.43	10.3.210.43
45	10.3.210.44/32	10.3.210.44 – 10.3.210.44	10.3.210.44
46	10.3.210.45/32	10.3.210.45 – 10.3.210.45	10.3.210.45
47	10.3.210.46/32	10.3.210.46 – 10.3.210.46	10.3.210.46
48	10.3.210.47/32	10.3.210.47 – 10.3.210.47	10.3.210.47
49	10.3.210.48/32	10.3.210.48 – 10.3.210.48	10.3.210.48
50	10.3.210.49/32	10.3.210.49 – 10.3.210.49	10.3.210.49
51	10.3.210.50/32	10.3.210.50 – 10.3.210.50	10.3.210.50
52	10.3.210.51/32	10.3.210.51 – 10.3.210.51	10.3.210.51
53	10.3.210.52/32	10.3.210.52 – 10.3.210.52	10.3.210.52
54	10.3.210.53/32	10.3.210.53 – 10.3.210.53	10.3.210.53
55	10.3.210.54/32	10.3.210.54 – 10.3.210.54	10.3.210.54
56	10.3.210.55/32	10.3.210.55 – 10.3.210.55	10.3.210.55
57	10.3.210.56/32	10.3.210.56 – 10.3.210.56	10.3.210.56
58	10.3.210.57/32	10.3.210.57 – 10.3.210.57	10.3.210.57
59	10.3.210.58/32	10.3.210.58 – 10.3.210.58	10.3.210.58
60	10.3.210.59/32	10.3.210.59 – 10.3.210.59	10.3.210.59
61	10.3.210.60/32	10.3.210.60 – 10.3.210.60	10.3.210.60
62	10.3.210.61/32	10.3.210.61 – 10.3.210.61	10.3.210.61
63	10.3.210.62/32	10.3.210.62 – 10.3.210.62	10.3.210.62
64	10.3.210.63/32	10.3.210.63 – 10.3.210.63	10.3.210.63
65	10.3.210.64/32	10.3.210.64 – 10.3.210.64	10.3.210.64
66	10.3.210.65/32	10.3.210.65 – 10.3.210.65	10.3.210.65
67	10.3.210.66/32	10.3.210.66 – 10.3.210.66	10.3.210.66
68	10.3.210.67/32	10.3.210.67 – 10.3.210.67	10.3.210.67
69	10.3.210.68/32	10.3.210.68 – 10.3.210.68	10.3.210.68
70	10.3.210.69/32	10.3.210.69 – 10.3.210.69	10.3.210.69
71	10.3.210.70/32	10.3.210.70 – 10.3.210.70	10.3.210.70
72	10.3.210.71/32	10.3.210.71 – 10.3.210.71	10.3.210.71
73	10.3.210.72/32	10.3.210.72 – 10.3.210.72	10.3.210.72
74	10.3.210.73/32	10.3.210.73 – 10.3.210.73	10.3.210.73
75	10.3.210.74/32	10.3.210.74 – 10.3.210.74	10.3.210.74
76	10.3.210.75/32	10.3.210.75 – 10.3.210.75	10.3.210.75
77	10.3.210.76/32	10.3.210.76 – 10.3.210.76	10.3.210.76
78	10.3.210.77/32	10.3.210.77 – 10.3.210.77	10.3.210.77
79	10.3.210.78/32	10.3.210.78 – 10.3.210.78	10.3.210.78
80	10.3.210.79/32	10.3.210.79 – 10.3.210.79	10.3.210.79
81	10.3.210.80/32	10.3.210.80 – 10.3.210.80	10.3.210.80
82	10.3.210.81/32	10.3.210.81 – 10.3.210.81	10.3.210.81
83	10.3.210.82/32	10.3.210.82 – 10.3.210.82	10.3.210.82
84	10.3.210.83/32	10.3.210.83 – 10.3.210.83	10.3.210.83
85	10.3.210.84/32	10.3.210.84 – 10.3.210.84	10.3.210.84
86	10.3.210.85/32	10.3.210.85 – 10.3.210.85	10.3.210.85
87	10.3.210.86/32	10.3.210.86 – 10.3.210.86	10.3.210.86
88	10.3.210.87/32	10.3.210.87 – 10.3.210.87	10.3.210.87
89	10.3.210.88/32	10.3.210.88 – 10.3.210.88	10.3.210.88
90	10.3.210.89/32	10.3.210.89 – 10.3.210.89	10.3.210.89
91	10.3.210.90/32	10.3.210.90 – 10.3.210.90	10.3.210.90
92	10.3.210.91/32	10.3.210.91 – 10.3.210.91	10.3.210.91
93	10.3.210.92/32	10.3.210.92 – 10.3.210.92	10.3.210.92
94	10.3.210.93/32	10.3.210.93 – 10.3.210.93	10.3.210.93
95	10.3.210.94/32	10.3.210.94 – 10.3.210.94	10.3.210.94
96	10.3.210.95/32	10.3.210.95 – 10.3.210.95	10.3.210.95
97	10.3.210.96/32	10.3.210.96 – 10.3.210.96	10.3.210.96
98	10.3.210.97/32	10.3.210.97 – 10.3.210.97	10.3.210.97
99	10.3.210.98/32	10.3.210.98 – 10.3.210.98	10.3.210.98
100	10.3.210.99/32	10.3.210.99 – 10.3.210.99	10.3.210.99
101	10.3.210.100/32	10.3.210.100 – 10.3.210.100	10.3.210.100
102	10.3.210.101/32	10.3.210.101 – 10.3.210.101	10.3.210.101
103	10.3.210.102/32	10.3.210.102 – 10.3.210.102	10.3.210.102
104	10.3.210.103/32	10.3.210.103 – 10.3.210.103	10.3.210.103
105	10.3.210.104/32	10.3.210.104 – 10.3.210.104	10.3.210.104
106	10.3.210.105/32	10.3.210.105 – 10.3.210.105	10.3.210.105
107	10.3.210.106/32	10.3.210.106 – 10.3.210.106	10.3.210.106
108	10.3.210.107/32	10.3.210.107 – 10.3.210.107	10.3.210.107
109	10.3.210.108/32	10.3.210.108 – 10.3.210.108	10.3.210.108
110	10.3.210.109/32	10.3.210.109 – 10.3.210.109	10.3.210.109
111	10.3.210.110/32	10.3.210.110 – 10.3.210.110	10.3.210.110
112	10.3.210.111/32	10.3.210.111 – 10.3.210.111	10.3.210.111
113	10.3.210.112/32	10.3.210.112 – 10.3.210.112	10.3.210.112
114	10.3.210.113/32	10.3.210.113 – 10.3.210.113	10.3.210.113
115	10.3.210.114/32	10.3.210.114 – 10.3.210.114	10.3.210.114
116	10.3.210.115/32	10.3.210.115 – 10.3.210.115	10.3.210.115
117	10.3.210.116/32	10.3.210.116 – 10.3.210.116	10.3.210.116
118	10.3.210.117/32	10.3.210.117 – 10.3.210.117	10.3.210.117
119	10.3.210.118/32	10.3.210.118 – 10.3.210.118	10.3.210.118
120	10.3.210.119/32	10.3.210.119 – 10.3.210.119	10.3.210.119
121	10.3.210.120/32	10.3.210.120 – 10.3.210.120	10.3.210.120
122	10.3.210.121/32	10.3.210.121 – 10.3.210.121	10.3.210.121
123	10.3.210.122/32	10.3.210.122 – 10.3.210.122	10.3.210.122
124	10.3.210.123/32	10.3.210.123 – 10.3.210.123	10.3.210.123
125	10.3.210.124/32	10.3.210.124 – 10.3.210.124	10.3.210.124
126	10.3.210.125/32	10.3.210.125 – 10.3.210.125	10.3.210.125
127	10.3.210.126/32	10.3.210.126 – 10.3.210.126	10.3.210.126
128	10.3.210.127/32	10.3.210.127 – 10.3.210.127	10.3.210.127

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 →