Data as of Nov 3, 2026
72.244.136.0/24
Anonymizer · ISP proxyGTT Communications Inc. · space held by GTT Americas, LLC
Announced by
Type
ISP proxy
Risk
90 / 100 · Critical
Recent change
New origin Aug 2026
its first announcement on record
IPv4 market
Path
Announced by AS3257 since Aug 2026 · 10 wk ago
1 · Holder
record created Mar 22, 2005 · reallocated to Internet Utilities NA LLC Jul 30, 2025
2 · Leased from
4 · Use
ISP proxy
anonymizer space, operator not named
Operators, sellers and brokers
Leased from
IP brokers
| Name | In 72.244.136.0/24 | /24s |
|---|---|---|
| IPXO | 256100% | 1 |
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Leased from | Proxy exits | Holder | RPKI |
|---|---|---|---|---|---|---|
| 72.244.0.0/15 since Apr 2023 | AS3257 | Internet provider | IP broker IPXO (part) | 433 76 always on | GTT Americas, LLC |
Registrations in this block
The registry's network records over this block, widest first, each under its parent.
| Range | Addresses | Netname | Holder | Type | Created | Abuse contact |
|---|---|---|---|---|---|---|
| 72.244.0.0/15 | 131,072 | MEGAPATH-BLK-63 | GTT Americas, LLC (GAL-104) · US | Direct Allocation | Mar 22, 2005 | [email protected] |
| └ 72.244.0.0/16 | 65,536 | IPXO-GTT | IPXO LLC (IL-845) · US | Reallocated | Jul 18, 2025 | [email protected] |
| └ 72.244.0.0/16 | 65,536 | NETUTILS | Internet Utilities NA LLC (DCL-577) · US | Reallocated | Jul 30, 2025 | [email protected] |
| └ 72.244.136.0/24 | 256 | NET-72-244-136-0-24 | IPNetZone (IPNET-1) · US | Reallocated | Mar 25, 2026 | [email protected] |
| └ 72.244.136.0/24 | 256 | RCN-GTT | RCN (RTSL-6) · US | Reallocated | Sep 25, 2026 | [email protected] |
Network & registry
Announced by
Covering announcement 72.244.136.0/23
- Prefix
- 72.244.136.0/23
- Announced by
- AS3257 GTT Communications Inc.
- Type
- ISP proxy
- Anonymizer addresses
- all
- Leased from
- IP broker IPXO
- RPKI
- RPKI valid
- Netname
- NETUTILS
- Registrant
- Internet Utilities NA LLC
- RIR
- ARIN
IPv4 market
Holder
- Organization
- GTT Americas, LLC
- Handle
- GAL-104
- Range
- 72.244.0.0/15
- Registration type
- Direct Allocation
- Record created
- Mar 22, 2005
- Reallocated to
- Internet Utilities NA LLC (DCL-577)
- Reallocated range
- 72.244.0.0/16
- Reallocated
- Jul 30, 2025
Origin network
AS3257
US
- Name
- GTT Communications Inc.
- Type
- Internet provider
- Registered
- Sep 30, 1994
- Domain
- gtt.net
- Website
- www.gtt.net
- Industry
- Internet Service Provider (ISP)
- Spamhaus ASN-DROP
- not listed
- VPN servers
- 244
Routing timeline
Covering aggregate above, the prefix's own history below
72.244.136.0/23
Routing history
- Pattern
- Stable
- First seen
- Aug 2026
- Current origin since
- Aug 2026 · 2 mo
- Origin networks
- 1
RPKI
Route origin authorizations
| ROA prefix | ASN | Max len | Anchor | Verdict |
|---|---|---|---|---|
| 72.244.136.0/23 | AS3257 | /24 | ARIN | RPKI valid |
| 72.244.136.0/23 | AS6079 | /24 | ARIN | Another network |
IRR
Route objects on 72.244.136.0/23
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS3257 | ARIN | GTT Americas, LLC | MNT-GAL-104 | Jul 31, 2026 |
Whois
Registration for this announcement
- Range
- 72.244.0.0/16
- Netname
- NETUTILS
- Registrant
- Internet Utilities NA LLC
- Organization
- Internet Utilities NA LLC (DCL-577)
- Org address
- 2711 Centerville Road, Wilmington, DE, 19808
- Org country
- US
- Type
- Reallocated
- Handle
- NET-72-244-0-0-3
- Parent
- NET-72-244-0-0-2
- Created
- Jul 30, 2025
- RIR
- ARIN
- Country
- US
- Delegated
- Mar 22, 2005
- Status
- assigned
Report abuse
Abuse contact
- [email protected]
- Name
- Internet Utilities Abuse
- Phone
- +1-650-934-1667
- Handle
- IUA-ARIN