Data as of Nov 14, 2026
206.187.28.0/22
No anonymizer space · no proxy exits in 30 daysMicrosoft Corporation · space held by SirsiDynix
Announcement
this exact prefix
RPKI valid
Announced by
Type
Hosting
Risk
50 / 100 · Medium
Recently moved
Recent change
New origin Sep 25, 2026
from AS1746 SirsiDynix
Registrations in this block
The registry's network records over the announcement: those covering it, widest first, then every record inside it, under its parent.
| Range | Addresses | Netname | Holder | Type | Created | Abuse contact |
|---|---|---|---|---|---|---|
| 206. | 49,152 | SIRSIDYNIX-NET-1 | SirsiDynix (SC-2233) · US | Direct Allocation | Nov 15, 1995 | noc@ |
| └ 206.187.28.0/22 | 1,024 | NET-206-187-28-0-1 | SAAS SirsiDynix Canada (C11692743) · CA | Reassigned | Aug 26, 2026 | noc@ via SIRSIDYNIX-NET-1 |
A contact marked “via” is the registry's: the record names none of its own, so the registry hands down its parent's.
Network & registry
Registry
Holder
- Organization
- SirsiDynix
- Handle
- SC-2233
- Range
- 206.
187. 0. 0 - 206. 187. 191. 255 - Registration type
- Direct Allocation
- Record created
- Nov 15, 1995
- Legacy
- yes
Origin network
AS8075
US
- Name
- Microsoft Corporation
- Type
- Hosting
- Registered
- Mar 31, 1997
- Domain
- microsoft.com
- Website
- www.microsoft.com
- Industry
- Software Development
- Spamhaus ASN-DROP
- not listed
Routing timeline
Who has announced this prefix
Summary
Routing history
- Pattern
- Rotating
- First seen
- Sep 2008
- Current origin since
- Sep 25, 2026 · 2 mo
- Origin networks
- 3
- Last change of origin
- Sep 25, 2026
Recorded history
History
- Handoffs
- 2
RPKI
Route origin authorizations
IRR
Route objects on the exact prefix
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS1746 not the origin | RADB | Sirsidynix-Block-MTL2 | MAINT-AS1746 | Nov 13, 2023 |
| AS1746 not the origin | ARIN | Sirsidynix | MNT-SC-2233 | Aug 31, 2026 |
| AS8075 | ARIN | SirsiDynix | MNT-SC-2233 | Aug 31, 2026 |
| AS8075 | RADB | Microsoft ByoIp | MAINT-AS8075 | Sep 24, 2026 |
| AS29909 not the origin | ARIN | Sirsidynix | MNT-SC-2233 | Aug 31, 2026 |
Whois
Registration for this announcement
- Range
- 206.
187. 28. 0/ 22 - Netname
- NET-206-187-28-0-1
- Registrant
- SAAS SirsiDynix Canada
- Organization
- SAAS SirsiDynix Canada (C11692743)
- Type
- Reassigned
- Handle
- NET-206-187-28-0-1
- Parent
- NET-206-187-0-0-1
- Created
- Aug 26, 2026
- RIR
- ARIN
- Country
- US
- Delegated
- Nov 15, 1995
- Status
- assigned
Report abuse
Abuse contact
- noc@
sirsidynix. com - Name
- Network Operations Center
- Phone
- +1-801-223-5200
- Handle
- NOC1883-ARIN