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)10.2.244.0/25

network10.2.244.0/25

broadcast10.2.244.127

first host10.2.244.1

last host10.2.244.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.244.0/25

address00001010.00000010.11110100.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.11110100.00000000

broadcast00001010.00000010.11110100.01111111

green = network part, grey = host part

hex0x0a02f400

decimal167965696

reverse dns0.244.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:f400

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.244.0/32	10.2.244.0 – 10.2.244.0	10.2.244.0
2	10.2.244.1/32	10.2.244.1 – 10.2.244.1	10.2.244.1
3	10.2.244.2/32	10.2.244.2 – 10.2.244.2	10.2.244.2
4	10.2.244.3/32	10.2.244.3 – 10.2.244.3	10.2.244.3
5	10.2.244.4/32	10.2.244.4 – 10.2.244.4	10.2.244.4
6	10.2.244.5/32	10.2.244.5 – 10.2.244.5	10.2.244.5
7	10.2.244.6/32	10.2.244.6 – 10.2.244.6	10.2.244.6
8	10.2.244.7/32	10.2.244.7 – 10.2.244.7	10.2.244.7
9	10.2.244.8/32	10.2.244.8 – 10.2.244.8	10.2.244.8
10	10.2.244.9/32	10.2.244.9 – 10.2.244.9	10.2.244.9
11	10.2.244.10/32	10.2.244.10 – 10.2.244.10	10.2.244.10
12	10.2.244.11/32	10.2.244.11 – 10.2.244.11	10.2.244.11
13	10.2.244.12/32	10.2.244.12 – 10.2.244.12	10.2.244.12
14	10.2.244.13/32	10.2.244.13 – 10.2.244.13	10.2.244.13
15	10.2.244.14/32	10.2.244.14 – 10.2.244.14	10.2.244.14
16	10.2.244.15/32	10.2.244.15 – 10.2.244.15	10.2.244.15
17	10.2.244.16/32	10.2.244.16 – 10.2.244.16	10.2.244.16
18	10.2.244.17/32	10.2.244.17 – 10.2.244.17	10.2.244.17
19	10.2.244.18/32	10.2.244.18 – 10.2.244.18	10.2.244.18
20	10.2.244.19/32	10.2.244.19 – 10.2.244.19	10.2.244.19
21	10.2.244.20/32	10.2.244.20 – 10.2.244.20	10.2.244.20
22	10.2.244.21/32	10.2.244.21 – 10.2.244.21	10.2.244.21
23	10.2.244.22/32	10.2.244.22 – 10.2.244.22	10.2.244.22
24	10.2.244.23/32	10.2.244.23 – 10.2.244.23	10.2.244.23
25	10.2.244.24/32	10.2.244.24 – 10.2.244.24	10.2.244.24
26	10.2.244.25/32	10.2.244.25 – 10.2.244.25	10.2.244.25
27	10.2.244.26/32	10.2.244.26 – 10.2.244.26	10.2.244.26
28	10.2.244.27/32	10.2.244.27 – 10.2.244.27	10.2.244.27
29	10.2.244.28/32	10.2.244.28 – 10.2.244.28	10.2.244.28
30	10.2.244.29/32	10.2.244.29 – 10.2.244.29	10.2.244.29
31	10.2.244.30/32	10.2.244.30 – 10.2.244.30	10.2.244.30
32	10.2.244.31/32	10.2.244.31 – 10.2.244.31	10.2.244.31
33	10.2.244.32/32	10.2.244.32 – 10.2.244.32	10.2.244.32
34	10.2.244.33/32	10.2.244.33 – 10.2.244.33	10.2.244.33
35	10.2.244.34/32	10.2.244.34 – 10.2.244.34	10.2.244.34
36	10.2.244.35/32	10.2.244.35 – 10.2.244.35	10.2.244.35
37	10.2.244.36/32	10.2.244.36 – 10.2.244.36	10.2.244.36
38	10.2.244.37/32	10.2.244.37 – 10.2.244.37	10.2.244.37
39	10.2.244.38/32	10.2.244.38 – 10.2.244.38	10.2.244.38
40	10.2.244.39/32	10.2.244.39 – 10.2.244.39	10.2.244.39
41	10.2.244.40/32	10.2.244.40 – 10.2.244.40	10.2.244.40
42	10.2.244.41/32	10.2.244.41 – 10.2.244.41	10.2.244.41
43	10.2.244.42/32	10.2.244.42 – 10.2.244.42	10.2.244.42
44	10.2.244.43/32	10.2.244.43 – 10.2.244.43	10.2.244.43
45	10.2.244.44/32	10.2.244.44 – 10.2.244.44	10.2.244.44
46	10.2.244.45/32	10.2.244.45 – 10.2.244.45	10.2.244.45
47	10.2.244.46/32	10.2.244.46 – 10.2.244.46	10.2.244.46
48	10.2.244.47/32	10.2.244.47 – 10.2.244.47	10.2.244.47
49	10.2.244.48/32	10.2.244.48 – 10.2.244.48	10.2.244.48
50	10.2.244.49/32	10.2.244.49 – 10.2.244.49	10.2.244.49
51	10.2.244.50/32	10.2.244.50 – 10.2.244.50	10.2.244.50
52	10.2.244.51/32	10.2.244.51 – 10.2.244.51	10.2.244.51
53	10.2.244.52/32	10.2.244.52 – 10.2.244.52	10.2.244.52
54	10.2.244.53/32	10.2.244.53 – 10.2.244.53	10.2.244.53
55	10.2.244.54/32	10.2.244.54 – 10.2.244.54	10.2.244.54
56	10.2.244.55/32	10.2.244.55 – 10.2.244.55	10.2.244.55
57	10.2.244.56/32	10.2.244.56 – 10.2.244.56	10.2.244.56
58	10.2.244.57/32	10.2.244.57 – 10.2.244.57	10.2.244.57
59	10.2.244.58/32	10.2.244.58 – 10.2.244.58	10.2.244.58
60	10.2.244.59/32	10.2.244.59 – 10.2.244.59	10.2.244.59
61	10.2.244.60/32	10.2.244.60 – 10.2.244.60	10.2.244.60
62	10.2.244.61/32	10.2.244.61 – 10.2.244.61	10.2.244.61
63	10.2.244.62/32	10.2.244.62 – 10.2.244.62	10.2.244.62
64	10.2.244.63/32	10.2.244.63 – 10.2.244.63	10.2.244.63
65	10.2.244.64/32	10.2.244.64 – 10.2.244.64	10.2.244.64
66	10.2.244.65/32	10.2.244.65 – 10.2.244.65	10.2.244.65
67	10.2.244.66/32	10.2.244.66 – 10.2.244.66	10.2.244.66
68	10.2.244.67/32	10.2.244.67 – 10.2.244.67	10.2.244.67
69	10.2.244.68/32	10.2.244.68 – 10.2.244.68	10.2.244.68
70	10.2.244.69/32	10.2.244.69 – 10.2.244.69	10.2.244.69
71	10.2.244.70/32	10.2.244.70 – 10.2.244.70	10.2.244.70
72	10.2.244.71/32	10.2.244.71 – 10.2.244.71	10.2.244.71
73	10.2.244.72/32	10.2.244.72 – 10.2.244.72	10.2.244.72
74	10.2.244.73/32	10.2.244.73 – 10.2.244.73	10.2.244.73
75	10.2.244.74/32	10.2.244.74 – 10.2.244.74	10.2.244.74
76	10.2.244.75/32	10.2.244.75 – 10.2.244.75	10.2.244.75
77	10.2.244.76/32	10.2.244.76 – 10.2.244.76	10.2.244.76
78	10.2.244.77/32	10.2.244.77 – 10.2.244.77	10.2.244.77
79	10.2.244.78/32	10.2.244.78 – 10.2.244.78	10.2.244.78
80	10.2.244.79/32	10.2.244.79 – 10.2.244.79	10.2.244.79
81	10.2.244.80/32	10.2.244.80 – 10.2.244.80	10.2.244.80
82	10.2.244.81/32	10.2.244.81 – 10.2.244.81	10.2.244.81
83	10.2.244.82/32	10.2.244.82 – 10.2.244.82	10.2.244.82
84	10.2.244.83/32	10.2.244.83 – 10.2.244.83	10.2.244.83
85	10.2.244.84/32	10.2.244.84 – 10.2.244.84	10.2.244.84
86	10.2.244.85/32	10.2.244.85 – 10.2.244.85	10.2.244.85
87	10.2.244.86/32	10.2.244.86 – 10.2.244.86	10.2.244.86
88	10.2.244.87/32	10.2.244.87 – 10.2.244.87	10.2.244.87
89	10.2.244.88/32	10.2.244.88 – 10.2.244.88	10.2.244.88
90	10.2.244.89/32	10.2.244.89 – 10.2.244.89	10.2.244.89
91	10.2.244.90/32	10.2.244.90 – 10.2.244.90	10.2.244.90
92	10.2.244.91/32	10.2.244.91 – 10.2.244.91	10.2.244.91
93	10.2.244.92/32	10.2.244.92 – 10.2.244.92	10.2.244.92
94	10.2.244.93/32	10.2.244.93 – 10.2.244.93	10.2.244.93
95	10.2.244.94/32	10.2.244.94 – 10.2.244.94	10.2.244.94
96	10.2.244.95/32	10.2.244.95 – 10.2.244.95	10.2.244.95
97	10.2.244.96/32	10.2.244.96 – 10.2.244.96	10.2.244.96
98	10.2.244.97/32	10.2.244.97 – 10.2.244.97	10.2.244.97
99	10.2.244.98/32	10.2.244.98 – 10.2.244.98	10.2.244.98
100	10.2.244.99/32	10.2.244.99 – 10.2.244.99	10.2.244.99
101	10.2.244.100/32	10.2.244.100 – 10.2.244.100	10.2.244.100
102	10.2.244.101/32	10.2.244.101 – 10.2.244.101	10.2.244.101
103	10.2.244.102/32	10.2.244.102 – 10.2.244.102	10.2.244.102
104	10.2.244.103/32	10.2.244.103 – 10.2.244.103	10.2.244.103
105	10.2.244.104/32	10.2.244.104 – 10.2.244.104	10.2.244.104
106	10.2.244.105/32	10.2.244.105 – 10.2.244.105	10.2.244.105
107	10.2.244.106/32	10.2.244.106 – 10.2.244.106	10.2.244.106
108	10.2.244.107/32	10.2.244.107 – 10.2.244.107	10.2.244.107
109	10.2.244.108/32	10.2.244.108 – 10.2.244.108	10.2.244.108
110	10.2.244.109/32	10.2.244.109 – 10.2.244.109	10.2.244.109
111	10.2.244.110/32	10.2.244.110 – 10.2.244.110	10.2.244.110
112	10.2.244.111/32	10.2.244.111 – 10.2.244.111	10.2.244.111
113	10.2.244.112/32	10.2.244.112 – 10.2.244.112	10.2.244.112
114	10.2.244.113/32	10.2.244.113 – 10.2.244.113	10.2.244.113
115	10.2.244.114/32	10.2.244.114 – 10.2.244.114	10.2.244.114
116	10.2.244.115/32	10.2.244.115 – 10.2.244.115	10.2.244.115
117	10.2.244.116/32	10.2.244.116 – 10.2.244.116	10.2.244.116
118	10.2.244.117/32	10.2.244.117 – 10.2.244.117	10.2.244.117
119	10.2.244.118/32	10.2.244.118 – 10.2.244.118	10.2.244.118
120	10.2.244.119/32	10.2.244.119 – 10.2.244.119	10.2.244.119
121	10.2.244.120/32	10.2.244.120 – 10.2.244.120	10.2.244.120
122	10.2.244.121/32	10.2.244.121 – 10.2.244.121	10.2.244.121
123	10.2.244.122/32	10.2.244.122 – 10.2.244.122	10.2.244.122
124	10.2.244.123/32	10.2.244.123 – 10.2.244.123	10.2.244.123
125	10.2.244.124/32	10.2.244.124 – 10.2.244.124	10.2.244.124
126	10.2.244.125/32	10.2.244.125 – 10.2.244.125	10.2.244.125
127	10.2.244.126/32	10.2.244.126 – 10.2.244.126	10.2.244.126
128	10.2.244.127/32	10.2.244.127 – 10.2.244.127	10.2.244.127

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 →