138.91.171.81
Classification: Whitelisted
138.91.171.81 is a whitelisted (trusted) IP address listed by Maltiverse. 65 sightings from 3 threat sources, last seen 2026-10-14.
Blacklist sightings
| Description | Source | First seen | Last seen | Labels | MITRE ATT&CK |
|---|---|---|---|---|---|
| Matched whitelist source: Microsoft_asn | Maltiverse | 2026-09-04 14:34:54 | 2026-10-14 19:06:33 | benign | |
| Proxy | IPWhois.io | 2025-12-08 00:17:13 | 2026-10-14 19:06:32 | anonymization proxy | |
| Proxy | FireHOL | 2024-04-11 15:42:39 | 2025-10-07 08:07:25 | anonymization | |
| Mail Spammer | Abuseat.org | 2024-04-11 15:42:42 | 2024-04-11 15:42:42 |
Tags
anonymizationWhois information
- AS name
- AS8075 Microsoft Corp
- AS registry
- arin
- AS date
- 2011-06-22 00:00:00
- AS CIDR
- 138.91.0.0/16
- CIDR
- 138.91.0.0/16
- Registrant
- Microsoft Corp
- Address
- One Microsoft Way
- City
- San Jose
- State
- CA
- Postal code
- 95025
- Country
- US — United States 🇺🇸
- Contact email
- [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected], [email protected]
- First indexed
- 2024-04-11 15:42:39
- Last updated
- 2026-10-14 19:06:33