| Date | IP Address |
| 2014-07-23 | 56.0.83.11 (ClassC) |
| Date | Domain | IP |
| uspscmgeus01.usps.gov | 2025-03-22 | 20.232.67.254 |
| dns141.usps.gov | 2025-06-09 | 56.0.141.25 |
| eagnmnbcexsldns1.usps.gov | 2025-03-19 | 56.0.141.25 |
| dns082.usps.gov | 2025-06-09 | 56.0.82.25 |
| ibcalcea.usps.gov | 2015-02-01 | 23.74.9.182 |
| postcalcea.usps.gov | 2025-01-03 | 152.195.33.23 |
| dbservicesea.usps.gov | 2024-10-04 | 152.195.33.23 |
| ibservicesea.usps.gov | 2024-12-22 | 152.195.33.23 |
| dbcalc.usps.gov | 2014-03-11 | 23.74.9.233 |
| ircalc.usps.gov | 2014-10-15 | 90.84.60.50 |
| postcalc.usps.gov | 2014-03-29 | 198.47.108.19 |
| pe.usps.gov | 2014-03-17 | 65.172.31.24 |
| liteblue.usps.gov | 2024-12-23 | 152.195.33.23 |
| www.liteblue.usps.gov | 2024-12-15 | 152.195.12.130 |
| blueearth.usps.gov | 2024-12-15 | 152.195.33.23 |
| www.blueearth.usps.gov | 2024-12-24 | 152.195.12.130 |
| dbcalcsm.usps.gov | 2024-12-18 | 152.195.33.23 |
| postcalcsm.usps.gov | 2025-01-05 | 152.195.33.23 |
| dbservicessm.usps.gov | 2024-09-10 | 152.195.33.23 |
| ibservicessm.usps.gov | 2024-10-14 | 152.195.33.23 |
| image.go.usps.gov | 2024-12-25 | 23.55.167.19 |
| ibservices.usps.gov | 2024-10-29 | 152.195.33.23 |
| gk-c-mail.srvs.usps.gov | 2014-05-22 | 56.0.142.11 |
| gk-w-mail.srvs.usps.gov | 2014-07-23 | 56.0.83.11 |
| ext-ereassign-cat.usps.gov | 2025-04-28 | 184.31.201.85 |
| www.usps.gov | 2024-12-15 | 152.195.33.23 |