Data as of Nov 3, 2026
51.19.0.0/21
Anonymizer · ISP proxyRCN · space held by Sky UK Limited
Announcement
this exact prefix
RPKI valid
Announced by
Type
ISP proxy
Risk
90 / 100 · Critical
Recent change
New origin Oct 10, 2026
its first announcement on record
IPv4 market
Path
Announced by AS6079 since Oct 10, 2026 · 3 wk ago
1 · Holder
record created Feb 5, 2026 · reallocated to Internet Utilities Europe and Asia Limited Feb 5, 2026
4 · Use
ISP proxy
anonymizer space, operator not named
Operators, sellers and brokers
Leased from
IP brokers
| Name | In 51.19.0.0/21 | /24s |
|---|---|---|
| IPXO | 2,048100% | 8 |
Leased from
Owners leasing their own space
| Name | In 51.19.0.0/21 | /24s |
|---|---|---|
| Sky UK Limited | 2,048100% | 8 |
Lineage
How this block came to its use, oldest first. The whole IPv4 market →
51.19.0.0/21
From the registry to its use
- Feb 5, 2026Registry recordSky UK LimitedALLOCATED PA51.19.0.0/16
- Feb 5, 2026ReallocatedInternet Utilities Europe and Asia LimitedSUB-ALLOCATED PA51.19.0.0/17
- Jul 30, 2026– Nov 2, 2026
- Oct 10, 2026– Nov 2, 2026
- todayLeased fromIPXOIP broker
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Anonymizer addresses | Leased from | Holder | RPKI |
|---|---|---|---|---|---|---|
| 51.19.0.0/17 since Jul 2026 | AS22773 | ISP proxy | 28,67288% | IP broker IPXO | Sky UK Limited via Internet Utilities Europe and Asia Limited |
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 |
|---|---|---|---|---|---|---|
| 51.19.0.0/16 | 65,536 | UK-SKY-19930901 | Sky UK Limited (ORG-SUL39-RIPE) · GB | ALLOCATED PA | Feb 5, 2026 | [email protected] |
| └ 51.19.0.0/17 | 32,768 | SKY-LEASED-IPXO | Internet Utilities Europe and Asia Limited (ORG-IL687-RIPE) · GB | SUB-ALLOCATED PA | Feb 5, 2026 | [email protected] |
Network & registry
IPv4 market
Holder
- Organization
- Sky UK Limited
- Handle
- ORG-SUL39-RIPE
- Range
- 51.19.0.0/16
- Registration type
- ALLOCATED PA
- Record created
- Feb 5, 2026
- Reallocated to
- Internet Utilities Europe and Asia Limited (ORG-IL687-RIPE)
- Reallocated range
- 51.19.0.0/17
- Reallocation type
- SUB-ALLOCATED PA
- Reallocated
- Feb 5, 2026
Origin network
AS6079
US
- Name
- RCN
- Type
- Internet provider
- Registered
- Apr 4, 2001
- Domain
- astound.com
- Website
- www.astound.com
- Industry
- Internet Service Provider (ISP)
- Spamhaus ASN-DROP
- not listed
Routing timeline
Covering aggregate above, the prefix's own history below
Summary
Routing history
- Pattern
- Stable
- First seen
- Oct 10, 2026
- Current origin since
- Oct 10, 2026 · under a month
- Origin networks
- 1
RPKI
Route origin authorizations
| ROA prefix | ASN | Max len | Anchor | Verdict |
|---|---|---|---|---|
| 51.19.0.0/17 | AS6079 | /24 | RIPE | RPKI valid |
| 51.19.0.0/17 | AS22773 | /24 | RIPE | Another network |
Whois
Registration for this announcement
- Range
- 51.19.0.0/17
- Netname
- SKY-LEASED-IPXO
- Registrant
- Internet Utilities Europe and Asia Limited
- Registrant country
- EU
- Organization
- Internet Utilities Europe and Asia Limited (ORG-IL687-RIPE)
- Org country
- GB
- Type
- SUB-ALLOCATED PA
- Created
- Feb 5, 2026
- Updated
- Aug 31, 2026
- Maintainer
- netutils-mnt
- RIR
- RIPE NCC
- Country
- GB
- Delegated
- Sep 1, 1993
- Status
- assigned
Report abuse
Abuse contact
- [email protected]
- Name
- Internet Utilities Abuse Contact
- Handle
- AR834