| Date | IP Address |
| 2025-01-15 | 103.9.100.181 (ClassC) |
| 2026-02-18 | 172.67.141.176 (ClassC) |
| 2026-02-24 | 104.21.46.204 (ClassC) |
| Date | Domain | IP |
| imap1.inp.com.sg | 2024-04-13 | 103.9.100.181 |
| imap2.inp.com.sg | 2024-12-28 | 103.9.100.181 |
| barracuda.inp.com.sg | 2024-09-17 | 103.9.100.181 |
| exchange.inp.com.sg | 2024-04-13 | 103.9.100.181 |
| home.inp.com.sg | 2025-01-15 | 103.9.100.181 |
| gate.inp.com.sg | 2024-04-15 | 103.9.100.181 |
| email.inp.com.sg | 2024-12-28 | 103.9.100.181 |
| imap.inp.com.sg | 2024-04-15 | 103.9.100.181 |
| authsmtp.inp.com.sg | 2024-11-04 | 103.9.100.181 |
| cpcalendars.inp.com.sg | 2024-04-13 | 103.9.100.181 |
| cpcontacts.inp.com.sg | 2024-12-28 | 103.9.100.181 |
| gw.inp.com.sg | 2024-09-17 | 103.9.100.181 |
| a.mx.inp.com.sg | 2024-11-04 | 103.9.100.181 |