Data as of Nov 3, 2026
63.128.21.0/24
No anonymizer space · no proxy exits in 30 daysMimecast North America Inc · space held by CenturyLink Communications, LLC
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Holder | RPKI |
|---|---|---|---|---|
| 63.128.0.0/18 since Jan 2021 | AS3561 | Internet provider | CenturyLink Communications, LLC | |
| 63.128.0.0/16 since May 2026 | AS3561 | Internet provider | CenturyLink Communications, LLC |
Network & registry
Origin network
AS30031
US
- Name
- Mimecast North America Inc
- Type
- Business
- Registered
- Jul 7, 2017
- Domain
- mimecast.com
- Industry
- Software Development
- Spamhaus ASN-DROP
- not listed
Routing timeline
Covering aggregate above, the prefix's own history below
Summary
Routing history
- Pattern
- Stable
- First seen
- Jul 2017
- Current origin since
- Jul 2017 · 9.3 yr
- Origin networks
- 1
IRR
Route objects on the exact prefix
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS30031 | RADB | Mimecast | MAINT-AS42427 | Nov 13, 2023 |
Whois
Registration for this announcement
- Range
- 63.128.0.0/15
- Netname
- CENTURYLINK-LEGACY-SAVVIS-BLK236
- Registrant
- CenturyLink Communications, LLC
- Organization
- CenturyLink Communications, LLC (CCL-534)
- Org address
- 100 CENTURYLINK DR, Monroe, LA, 71201
- Org country
- US
- Type
- Direct Allocation
- Handle
- NET-63-128-0-0-2
- Parent
- NET-63-0-0-0-0
- Created
- Nov 30, 1999
- RIR
- ARIN
- Country
- US
- Delegated
- Nov 30, 1999
- Status
- assigned
Report abuse
Abuse contact
- [email protected]
- Name
- Centurylink Abuse Desk
- Phone
- +1-877-886-6515
- Handle
- CAD54-ARIN