How do I specify the IP addresses that can access the SRS?
Registrars authorized to access the SRS must specify the following:
- A maximum of five (5) subnets
- A maximum of 64 static IP addresses shared between the five (5) subnets
- Subnets must be listed in Classless Inter-Domain Routing (CIDR) format specifying the network address and the number of bits used for the subnet mask, for example 192.168.1.0/27
- Subnets must not cross bit boundaries (see table below for bit boundary examples)
| CIDR Length |
# of Hosts |
Bit Boundaries |
|
/26 |
64 |
0, 64, 128, 192 |
|
/27 |
32 |
0, 32, 64, 96, 128, 160, 192, 224 |
|
/28 |
16 |
0, 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 184, 192, 200, 208, 224, 240 |
|
/29 |
8 |
0, 8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, 96, 104, 112, 120, 128, 136, 144, 152, 160, 168, 176, 184, 192, 200, 208, 216, 224, 232, 240, 248 |
|
/30 |
4 |
0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44,48,52,56,60,64,68,72,76,80, 84, 88, 92, 96, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140, 144, 148, 152, 156, 160, 164, 168, 172, 176, 180, 184, 188, 192, 196, 200, 204, 208, 212, 216, 220, 224, 228, 232, 236, 240, 244, 248, 252 |
|
/31 |
2 |
0, 2, 4, 6,8,10,12,14,16,18,20,22,24,26,28,30,32,34,36,38,40,42, 44, 46, 48, 50, 52, 54, 56, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100, 102, 104, 106, 108, 110, 112, 114, 116, 118, 120, 122, 124, 126, 128, 130, 132, 134, 136, 138, 140, 142, 144, 146, 148, 150, 152, 154, 156, 158, 160, 162, 164, 166, 168, 170, 172, 174, 176, 178, 180, 182, 184, 186, 188, 190, 192, 194, 196, 198, 200, 202, 204, 206, 208, 210, 212, 214, 216, 218, 220, 222, 224, 226, 228, 230, 232, 234, 236, 238, 240, 242, 244, 246, 248, 250, 252, 254 |
|
/32 |
1 |
1 to 254 |
