Fastmail Network Infrastructure Profile

Current status

Legal type:Private companyNot yet assessed

7

IPv44

202.12.124.0/24204.75.18.0/23204.75.18.0/24204.75.19.0/24

IPv63

2402:5d60:1000::/362402:5d60::/322402:5d60::/36

3

Contact:adminHigh confidence

Contact:otherHigh confidence

1

Fastmail Made DDoS Ransom Refusal a Security-Economics Accountability Test
Fastmail's October 2021 DDoS extortion episode showed why an email provider's security duty includes continuity, disciplined communication, and a refusal policy that accounts for the economics of the next attack as well as the pressure of the current one.
Primary articlePublished 2026-07-23