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)10.4.99.0/25

network10.4.99.0/25

broadcast10.4.99.127

first host10.4.99.1

last host10.4.99.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.4.99.0/25

address00001010.00000100.01100011.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000100.01100011.00000000

broadcast00001010.00000100.01100011.01111111

green = network part, grey = host part

hex0x0a046300

decimal168059648

reverse dns0.99.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:6300

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.4.99.0/32	10.4.99.0 – 10.4.99.0	10.4.99.0
2	10.4.99.1/32	10.4.99.1 – 10.4.99.1	10.4.99.1
3	10.4.99.2/32	10.4.99.2 – 10.4.99.2	10.4.99.2
4	10.4.99.3/32	10.4.99.3 – 10.4.99.3	10.4.99.3
5	10.4.99.4/32	10.4.99.4 – 10.4.99.4	10.4.99.4
6	10.4.99.5/32	10.4.99.5 – 10.4.99.5	10.4.99.5
7	10.4.99.6/32	10.4.99.6 – 10.4.99.6	10.4.99.6
8	10.4.99.7/32	10.4.99.7 – 10.4.99.7	10.4.99.7
9	10.4.99.8/32	10.4.99.8 – 10.4.99.8	10.4.99.8
10	10.4.99.9/32	10.4.99.9 – 10.4.99.9	10.4.99.9
11	10.4.99.10/32	10.4.99.10 – 10.4.99.10	10.4.99.10
12	10.4.99.11/32	10.4.99.11 – 10.4.99.11	10.4.99.11
13	10.4.99.12/32	10.4.99.12 – 10.4.99.12	10.4.99.12
14	10.4.99.13/32	10.4.99.13 – 10.4.99.13	10.4.99.13
15	10.4.99.14/32	10.4.99.14 – 10.4.99.14	10.4.99.14
16	10.4.99.15/32	10.4.99.15 – 10.4.99.15	10.4.99.15
17	10.4.99.16/32	10.4.99.16 – 10.4.99.16	10.4.99.16
18	10.4.99.17/32	10.4.99.17 – 10.4.99.17	10.4.99.17
19	10.4.99.18/32	10.4.99.18 – 10.4.99.18	10.4.99.18
20	10.4.99.19/32	10.4.99.19 – 10.4.99.19	10.4.99.19
21	10.4.99.20/32	10.4.99.20 – 10.4.99.20	10.4.99.20
22	10.4.99.21/32	10.4.99.21 – 10.4.99.21	10.4.99.21
23	10.4.99.22/32	10.4.99.22 – 10.4.99.22	10.4.99.22
24	10.4.99.23/32	10.4.99.23 – 10.4.99.23	10.4.99.23
25	10.4.99.24/32	10.4.99.24 – 10.4.99.24	10.4.99.24
26	10.4.99.25/32	10.4.99.25 – 10.4.99.25	10.4.99.25
27	10.4.99.26/32	10.4.99.26 – 10.4.99.26	10.4.99.26
28	10.4.99.27/32	10.4.99.27 – 10.4.99.27	10.4.99.27
29	10.4.99.28/32	10.4.99.28 – 10.4.99.28	10.4.99.28
30	10.4.99.29/32	10.4.99.29 – 10.4.99.29	10.4.99.29
31	10.4.99.30/32	10.4.99.30 – 10.4.99.30	10.4.99.30
32	10.4.99.31/32	10.4.99.31 – 10.4.99.31	10.4.99.31
33	10.4.99.32/32	10.4.99.32 – 10.4.99.32	10.4.99.32
34	10.4.99.33/32	10.4.99.33 – 10.4.99.33	10.4.99.33
35	10.4.99.34/32	10.4.99.34 – 10.4.99.34	10.4.99.34
36	10.4.99.35/32	10.4.99.35 – 10.4.99.35	10.4.99.35
37	10.4.99.36/32	10.4.99.36 – 10.4.99.36	10.4.99.36
38	10.4.99.37/32	10.4.99.37 – 10.4.99.37	10.4.99.37
39	10.4.99.38/32	10.4.99.38 – 10.4.99.38	10.4.99.38
40	10.4.99.39/32	10.4.99.39 – 10.4.99.39	10.4.99.39
41	10.4.99.40/32	10.4.99.40 – 10.4.99.40	10.4.99.40
42	10.4.99.41/32	10.4.99.41 – 10.4.99.41	10.4.99.41
43	10.4.99.42/32	10.4.99.42 – 10.4.99.42	10.4.99.42
44	10.4.99.43/32	10.4.99.43 – 10.4.99.43	10.4.99.43
45	10.4.99.44/32	10.4.99.44 – 10.4.99.44	10.4.99.44
46	10.4.99.45/32	10.4.99.45 – 10.4.99.45	10.4.99.45
47	10.4.99.46/32	10.4.99.46 – 10.4.99.46	10.4.99.46
48	10.4.99.47/32	10.4.99.47 – 10.4.99.47	10.4.99.47
49	10.4.99.48/32	10.4.99.48 – 10.4.99.48	10.4.99.48
50	10.4.99.49/32	10.4.99.49 – 10.4.99.49	10.4.99.49
51	10.4.99.50/32	10.4.99.50 – 10.4.99.50	10.4.99.50
52	10.4.99.51/32	10.4.99.51 – 10.4.99.51	10.4.99.51
53	10.4.99.52/32	10.4.99.52 – 10.4.99.52	10.4.99.52
54	10.4.99.53/32	10.4.99.53 – 10.4.99.53	10.4.99.53
55	10.4.99.54/32	10.4.99.54 – 10.4.99.54	10.4.99.54
56	10.4.99.55/32	10.4.99.55 – 10.4.99.55	10.4.99.55
57	10.4.99.56/32	10.4.99.56 – 10.4.99.56	10.4.99.56
58	10.4.99.57/32	10.4.99.57 – 10.4.99.57	10.4.99.57
59	10.4.99.58/32	10.4.99.58 – 10.4.99.58	10.4.99.58
60	10.4.99.59/32	10.4.99.59 – 10.4.99.59	10.4.99.59
61	10.4.99.60/32	10.4.99.60 – 10.4.99.60	10.4.99.60
62	10.4.99.61/32	10.4.99.61 – 10.4.99.61	10.4.99.61
63	10.4.99.62/32	10.4.99.62 – 10.4.99.62	10.4.99.62
64	10.4.99.63/32	10.4.99.63 – 10.4.99.63	10.4.99.63
65	10.4.99.64/32	10.4.99.64 – 10.4.99.64	10.4.99.64
66	10.4.99.65/32	10.4.99.65 – 10.4.99.65	10.4.99.65
67	10.4.99.66/32	10.4.99.66 – 10.4.99.66	10.4.99.66
68	10.4.99.67/32	10.4.99.67 – 10.4.99.67	10.4.99.67
69	10.4.99.68/32	10.4.99.68 – 10.4.99.68	10.4.99.68
70	10.4.99.69/32	10.4.99.69 – 10.4.99.69	10.4.99.69
71	10.4.99.70/32	10.4.99.70 – 10.4.99.70	10.4.99.70
72	10.4.99.71/32	10.4.99.71 – 10.4.99.71	10.4.99.71
73	10.4.99.72/32	10.4.99.72 – 10.4.99.72	10.4.99.72
74	10.4.99.73/32	10.4.99.73 – 10.4.99.73	10.4.99.73
75	10.4.99.74/32	10.4.99.74 – 10.4.99.74	10.4.99.74
76	10.4.99.75/32	10.4.99.75 – 10.4.99.75	10.4.99.75
77	10.4.99.76/32	10.4.99.76 – 10.4.99.76	10.4.99.76
78	10.4.99.77/32	10.4.99.77 – 10.4.99.77	10.4.99.77
79	10.4.99.78/32	10.4.99.78 – 10.4.99.78	10.4.99.78
80	10.4.99.79/32	10.4.99.79 – 10.4.99.79	10.4.99.79
81	10.4.99.80/32	10.4.99.80 – 10.4.99.80	10.4.99.80
82	10.4.99.81/32	10.4.99.81 – 10.4.99.81	10.4.99.81
83	10.4.99.82/32	10.4.99.82 – 10.4.99.82	10.4.99.82
84	10.4.99.83/32	10.4.99.83 – 10.4.99.83	10.4.99.83
85	10.4.99.84/32	10.4.99.84 – 10.4.99.84	10.4.99.84
86	10.4.99.85/32	10.4.99.85 – 10.4.99.85	10.4.99.85
87	10.4.99.86/32	10.4.99.86 – 10.4.99.86	10.4.99.86
88	10.4.99.87/32	10.4.99.87 – 10.4.99.87	10.4.99.87
89	10.4.99.88/32	10.4.99.88 – 10.4.99.88	10.4.99.88
90	10.4.99.89/32	10.4.99.89 – 10.4.99.89	10.4.99.89
91	10.4.99.90/32	10.4.99.90 – 10.4.99.90	10.4.99.90
92	10.4.99.91/32	10.4.99.91 – 10.4.99.91	10.4.99.91
93	10.4.99.92/32	10.4.99.92 – 10.4.99.92	10.4.99.92
94	10.4.99.93/32	10.4.99.93 – 10.4.99.93	10.4.99.93
95	10.4.99.94/32	10.4.99.94 – 10.4.99.94	10.4.99.94
96	10.4.99.95/32	10.4.99.95 – 10.4.99.95	10.4.99.95
97	10.4.99.96/32	10.4.99.96 – 10.4.99.96	10.4.99.96
98	10.4.99.97/32	10.4.99.97 – 10.4.99.97	10.4.99.97
99	10.4.99.98/32	10.4.99.98 – 10.4.99.98	10.4.99.98
100	10.4.99.99/32	10.4.99.99 – 10.4.99.99	10.4.99.99
101	10.4.99.100/32	10.4.99.100 – 10.4.99.100	10.4.99.100
102	10.4.99.101/32	10.4.99.101 – 10.4.99.101	10.4.99.101
103	10.4.99.102/32	10.4.99.102 – 10.4.99.102	10.4.99.102
104	10.4.99.103/32	10.4.99.103 – 10.4.99.103	10.4.99.103
105	10.4.99.104/32	10.4.99.104 – 10.4.99.104	10.4.99.104
106	10.4.99.105/32	10.4.99.105 – 10.4.99.105	10.4.99.105
107	10.4.99.106/32	10.4.99.106 – 10.4.99.106	10.4.99.106
108	10.4.99.107/32	10.4.99.107 – 10.4.99.107	10.4.99.107
109	10.4.99.108/32	10.4.99.108 – 10.4.99.108	10.4.99.108
110	10.4.99.109/32	10.4.99.109 – 10.4.99.109	10.4.99.109
111	10.4.99.110/32	10.4.99.110 – 10.4.99.110	10.4.99.110
112	10.4.99.111/32	10.4.99.111 – 10.4.99.111	10.4.99.111
113	10.4.99.112/32	10.4.99.112 – 10.4.99.112	10.4.99.112
114	10.4.99.113/32	10.4.99.113 – 10.4.99.113	10.4.99.113
115	10.4.99.114/32	10.4.99.114 – 10.4.99.114	10.4.99.114
116	10.4.99.115/32	10.4.99.115 – 10.4.99.115	10.4.99.115
117	10.4.99.116/32	10.4.99.116 – 10.4.99.116	10.4.99.116
118	10.4.99.117/32	10.4.99.117 – 10.4.99.117	10.4.99.117
119	10.4.99.118/32	10.4.99.118 – 10.4.99.118	10.4.99.118
120	10.4.99.119/32	10.4.99.119 – 10.4.99.119	10.4.99.119
121	10.4.99.120/32	10.4.99.120 – 10.4.99.120	10.4.99.120
122	10.4.99.121/32	10.4.99.121 – 10.4.99.121	10.4.99.121
123	10.4.99.122/32	10.4.99.122 – 10.4.99.122	10.4.99.122
124	10.4.99.123/32	10.4.99.123 – 10.4.99.123	10.4.99.123
125	10.4.99.124/32	10.4.99.124 – 10.4.99.124	10.4.99.124
126	10.4.99.125/32	10.4.99.125 – 10.4.99.125	10.4.99.125
127	10.4.99.126/32	10.4.99.126 – 10.4.99.126	10.4.99.126
128	10.4.99.127/32	10.4.99.127 – 10.4.99.127	10.4.99.127

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 →