| Property | Value |
| domainadminit@harpercollins.com | |
| NameServer | DMTU.MT.NS.ELS-GMS.ATT.NET |
| Created | 1994-04-13 00:00:00 |
| Changed | 2015-03-13 00:00:00 |
| Expires | 2016-04-14 00:00:00 |
| Registrar | MARKMONITOR INC. |
| Date | IP Address |
| 2018-02-28 | 34.199.83.250 (ClassC) |
| 2024-05-24 | 54.83.12.43 (ClassC) |
| 2025-10-28 | 34.231.224.3 (ClassC) |
| 2025-11-11 | 54.175.77.99 (ClassC) |
| 2025-11-29 | 100.25.62.108 (ClassC) |
| 2025-12-03 | 54.145.190.106 (ClassC) |
| Date | Domain | IP |
| static.harpercollins.com | 2014-11-25 | 165.254.155.221 |
| browseinside.harpercollins.com | 2014-03-25 | 165.254.155.48 |
| www.readersroom.harpercollins.com | 2025-03-15 | 18.65.229.14 |
| cdn.harpercollins.com | 2015-02-12 | 198.173.2.40 |
| ads.harpercollins.com | 2025-10-28 | 34.231.224.3 |
| files.harpercollins.com | 2014-03-14 | 165.254.206.89 |
| www.harpercollins.com | 2014-03-26 | 23.3.96.105 |