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)10.2.199.0/25

network10.2.199.0/25

broadcast10.2.199.127

first host10.2.199.1

last host10.2.199.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.199.0/25

address00001010.00000010.11000111.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.11000111.00000000

broadcast00001010.00000010.11000111.01111111

green = network part, grey = host part

hex0x0a02c700

decimal167954176

reverse dns0.199.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:c700

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.199.0/32	10.2.199.0 – 10.2.199.0	10.2.199.0
2	10.2.199.1/32	10.2.199.1 – 10.2.199.1	10.2.199.1
3	10.2.199.2/32	10.2.199.2 – 10.2.199.2	10.2.199.2
4	10.2.199.3/32	10.2.199.3 – 10.2.199.3	10.2.199.3
5	10.2.199.4/32	10.2.199.4 – 10.2.199.4	10.2.199.4
6	10.2.199.5/32	10.2.199.5 – 10.2.199.5	10.2.199.5
7	10.2.199.6/32	10.2.199.6 – 10.2.199.6	10.2.199.6
8	10.2.199.7/32	10.2.199.7 – 10.2.199.7	10.2.199.7
9	10.2.199.8/32	10.2.199.8 – 10.2.199.8	10.2.199.8
10	10.2.199.9/32	10.2.199.9 – 10.2.199.9	10.2.199.9
11	10.2.199.10/32	10.2.199.10 – 10.2.199.10	10.2.199.10
12	10.2.199.11/32	10.2.199.11 – 10.2.199.11	10.2.199.11
13	10.2.199.12/32	10.2.199.12 – 10.2.199.12	10.2.199.12
14	10.2.199.13/32	10.2.199.13 – 10.2.199.13	10.2.199.13
15	10.2.199.14/32	10.2.199.14 – 10.2.199.14	10.2.199.14
16	10.2.199.15/32	10.2.199.15 – 10.2.199.15	10.2.199.15
17	10.2.199.16/32	10.2.199.16 – 10.2.199.16	10.2.199.16
18	10.2.199.17/32	10.2.199.17 – 10.2.199.17	10.2.199.17
19	10.2.199.18/32	10.2.199.18 – 10.2.199.18	10.2.199.18
20	10.2.199.19/32	10.2.199.19 – 10.2.199.19	10.2.199.19
21	10.2.199.20/32	10.2.199.20 – 10.2.199.20	10.2.199.20
22	10.2.199.21/32	10.2.199.21 – 10.2.199.21	10.2.199.21
23	10.2.199.22/32	10.2.199.22 – 10.2.199.22	10.2.199.22
24	10.2.199.23/32	10.2.199.23 – 10.2.199.23	10.2.199.23
25	10.2.199.24/32	10.2.199.24 – 10.2.199.24	10.2.199.24
26	10.2.199.25/32	10.2.199.25 – 10.2.199.25	10.2.199.25
27	10.2.199.26/32	10.2.199.26 – 10.2.199.26	10.2.199.26
28	10.2.199.27/32	10.2.199.27 – 10.2.199.27	10.2.199.27
29	10.2.199.28/32	10.2.199.28 – 10.2.199.28	10.2.199.28
30	10.2.199.29/32	10.2.199.29 – 10.2.199.29	10.2.199.29
31	10.2.199.30/32	10.2.199.30 – 10.2.199.30	10.2.199.30
32	10.2.199.31/32	10.2.199.31 – 10.2.199.31	10.2.199.31
33	10.2.199.32/32	10.2.199.32 – 10.2.199.32	10.2.199.32
34	10.2.199.33/32	10.2.199.33 – 10.2.199.33	10.2.199.33
35	10.2.199.34/32	10.2.199.34 – 10.2.199.34	10.2.199.34
36	10.2.199.35/32	10.2.199.35 – 10.2.199.35	10.2.199.35
37	10.2.199.36/32	10.2.199.36 – 10.2.199.36	10.2.199.36
38	10.2.199.37/32	10.2.199.37 – 10.2.199.37	10.2.199.37
39	10.2.199.38/32	10.2.199.38 – 10.2.199.38	10.2.199.38
40	10.2.199.39/32	10.2.199.39 – 10.2.199.39	10.2.199.39
41	10.2.199.40/32	10.2.199.40 – 10.2.199.40	10.2.199.40
42	10.2.199.41/32	10.2.199.41 – 10.2.199.41	10.2.199.41
43	10.2.199.42/32	10.2.199.42 – 10.2.199.42	10.2.199.42
44	10.2.199.43/32	10.2.199.43 – 10.2.199.43	10.2.199.43
45	10.2.199.44/32	10.2.199.44 – 10.2.199.44	10.2.199.44
46	10.2.199.45/32	10.2.199.45 – 10.2.199.45	10.2.199.45
47	10.2.199.46/32	10.2.199.46 – 10.2.199.46	10.2.199.46
48	10.2.199.47/32	10.2.199.47 – 10.2.199.47	10.2.199.47
49	10.2.199.48/32	10.2.199.48 – 10.2.199.48	10.2.199.48
50	10.2.199.49/32	10.2.199.49 – 10.2.199.49	10.2.199.49
51	10.2.199.50/32	10.2.199.50 – 10.2.199.50	10.2.199.50
52	10.2.199.51/32	10.2.199.51 – 10.2.199.51	10.2.199.51
53	10.2.199.52/32	10.2.199.52 – 10.2.199.52	10.2.199.52
54	10.2.199.53/32	10.2.199.53 – 10.2.199.53	10.2.199.53
55	10.2.199.54/32	10.2.199.54 – 10.2.199.54	10.2.199.54
56	10.2.199.55/32	10.2.199.55 – 10.2.199.55	10.2.199.55
57	10.2.199.56/32	10.2.199.56 – 10.2.199.56	10.2.199.56
58	10.2.199.57/32	10.2.199.57 – 10.2.199.57	10.2.199.57
59	10.2.199.58/32	10.2.199.58 – 10.2.199.58	10.2.199.58
60	10.2.199.59/32	10.2.199.59 – 10.2.199.59	10.2.199.59
61	10.2.199.60/32	10.2.199.60 – 10.2.199.60	10.2.199.60
62	10.2.199.61/32	10.2.199.61 – 10.2.199.61	10.2.199.61
63	10.2.199.62/32	10.2.199.62 – 10.2.199.62	10.2.199.62
64	10.2.199.63/32	10.2.199.63 – 10.2.199.63	10.2.199.63
65	10.2.199.64/32	10.2.199.64 – 10.2.199.64	10.2.199.64
66	10.2.199.65/32	10.2.199.65 – 10.2.199.65	10.2.199.65
67	10.2.199.66/32	10.2.199.66 – 10.2.199.66	10.2.199.66
68	10.2.199.67/32	10.2.199.67 – 10.2.199.67	10.2.199.67
69	10.2.199.68/32	10.2.199.68 – 10.2.199.68	10.2.199.68
70	10.2.199.69/32	10.2.199.69 – 10.2.199.69	10.2.199.69
71	10.2.199.70/32	10.2.199.70 – 10.2.199.70	10.2.199.70
72	10.2.199.71/32	10.2.199.71 – 10.2.199.71	10.2.199.71
73	10.2.199.72/32	10.2.199.72 – 10.2.199.72	10.2.199.72
74	10.2.199.73/32	10.2.199.73 – 10.2.199.73	10.2.199.73
75	10.2.199.74/32	10.2.199.74 – 10.2.199.74	10.2.199.74
76	10.2.199.75/32	10.2.199.75 – 10.2.199.75	10.2.199.75
77	10.2.199.76/32	10.2.199.76 – 10.2.199.76	10.2.199.76
78	10.2.199.77/32	10.2.199.77 – 10.2.199.77	10.2.199.77
79	10.2.199.78/32	10.2.199.78 – 10.2.199.78	10.2.199.78
80	10.2.199.79/32	10.2.199.79 – 10.2.199.79	10.2.199.79
81	10.2.199.80/32	10.2.199.80 – 10.2.199.80	10.2.199.80
82	10.2.199.81/32	10.2.199.81 – 10.2.199.81	10.2.199.81
83	10.2.199.82/32	10.2.199.82 – 10.2.199.82	10.2.199.82
84	10.2.199.83/32	10.2.199.83 – 10.2.199.83	10.2.199.83
85	10.2.199.84/32	10.2.199.84 – 10.2.199.84	10.2.199.84
86	10.2.199.85/32	10.2.199.85 – 10.2.199.85	10.2.199.85
87	10.2.199.86/32	10.2.199.86 – 10.2.199.86	10.2.199.86
88	10.2.199.87/32	10.2.199.87 – 10.2.199.87	10.2.199.87
89	10.2.199.88/32	10.2.199.88 – 10.2.199.88	10.2.199.88
90	10.2.199.89/32	10.2.199.89 – 10.2.199.89	10.2.199.89
91	10.2.199.90/32	10.2.199.90 – 10.2.199.90	10.2.199.90
92	10.2.199.91/32	10.2.199.91 – 10.2.199.91	10.2.199.91
93	10.2.199.92/32	10.2.199.92 – 10.2.199.92	10.2.199.92
94	10.2.199.93/32	10.2.199.93 – 10.2.199.93	10.2.199.93
95	10.2.199.94/32	10.2.199.94 – 10.2.199.94	10.2.199.94
96	10.2.199.95/32	10.2.199.95 – 10.2.199.95	10.2.199.95
97	10.2.199.96/32	10.2.199.96 – 10.2.199.96	10.2.199.96
98	10.2.199.97/32	10.2.199.97 – 10.2.199.97	10.2.199.97
99	10.2.199.98/32	10.2.199.98 – 10.2.199.98	10.2.199.98
100	10.2.199.99/32	10.2.199.99 – 10.2.199.99	10.2.199.99
101	10.2.199.100/32	10.2.199.100 – 10.2.199.100	10.2.199.100
102	10.2.199.101/32	10.2.199.101 – 10.2.199.101	10.2.199.101
103	10.2.199.102/32	10.2.199.102 – 10.2.199.102	10.2.199.102
104	10.2.199.103/32	10.2.199.103 – 10.2.199.103	10.2.199.103
105	10.2.199.104/32	10.2.199.104 – 10.2.199.104	10.2.199.104
106	10.2.199.105/32	10.2.199.105 – 10.2.199.105	10.2.199.105
107	10.2.199.106/32	10.2.199.106 – 10.2.199.106	10.2.199.106
108	10.2.199.107/32	10.2.199.107 – 10.2.199.107	10.2.199.107
109	10.2.199.108/32	10.2.199.108 – 10.2.199.108	10.2.199.108
110	10.2.199.109/32	10.2.199.109 – 10.2.199.109	10.2.199.109
111	10.2.199.110/32	10.2.199.110 – 10.2.199.110	10.2.199.110
112	10.2.199.111/32	10.2.199.111 – 10.2.199.111	10.2.199.111
113	10.2.199.112/32	10.2.199.112 – 10.2.199.112	10.2.199.112
114	10.2.199.113/32	10.2.199.113 – 10.2.199.113	10.2.199.113
115	10.2.199.114/32	10.2.199.114 – 10.2.199.114	10.2.199.114
116	10.2.199.115/32	10.2.199.115 – 10.2.199.115	10.2.199.115
117	10.2.199.116/32	10.2.199.116 – 10.2.199.116	10.2.199.116
118	10.2.199.117/32	10.2.199.117 – 10.2.199.117	10.2.199.117
119	10.2.199.118/32	10.2.199.118 – 10.2.199.118	10.2.199.118
120	10.2.199.119/32	10.2.199.119 – 10.2.199.119	10.2.199.119
121	10.2.199.120/32	10.2.199.120 – 10.2.199.120	10.2.199.120
122	10.2.199.121/32	10.2.199.121 – 10.2.199.121	10.2.199.121
123	10.2.199.122/32	10.2.199.122 – 10.2.199.122	10.2.199.122
124	10.2.199.123/32	10.2.199.123 – 10.2.199.123	10.2.199.123
125	10.2.199.124/32	10.2.199.124 – 10.2.199.124	10.2.199.124
126	10.2.199.125/32	10.2.199.125 – 10.2.199.125	10.2.199.125
127	10.2.199.126/32	10.2.199.126 – 10.2.199.126	10.2.199.126
128	10.2.199.127/32	10.2.199.127 – 10.2.199.127	10.2.199.127

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 →