Data as of Nov 14, 2026
137.239.221.0/24
No anonymizer space · no proxy exits in 30 daysViskase Companies, Inc. · space held by Momentum Telecom, Inc.
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 |
|---|---|---|---|---|---|---|
| 137.239.192.0/19 | 8,192 | MOMEN-5 | Momentum Telecom, Inc. (MOMEN-5) · US | Direct Allocation | Jun 14, 2022 | motelrt@ |
| └ 137.239.221.0/24 | 256 | R89860 | Viskase Companies, Inc. (VISKA) · US | Reassigned | May 1, 2025 | abuse@ |
Network & registry
Registry
Holder
- Organization
- Momentum Telecom, Inc.
- Handle
- MOMEN-5
- Range
- 137.
239. 192. 0/ 19 - Registration type
- Direct Allocation
- Record created
- Jun 14, 2022
Origin network
AS31755
US
- Name
- Viskase Companies, Inc.
- Type
- Business
- Registered
- Jan 25, 2007
- Domain
- viskase.com
- Industry
- Service
- Spamhaus ASN-DROP
- not listed
Routing timeline
Who has announced this prefix
Summary
Routing history
- Pattern
- Stable
- First seen
- Apr 2025
- Current origin since
- Apr 2025 · 1.5 yr
- Origin networks
- 1
IRR
Route objects on the exact prefix
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS31755 | ARIN | 333 E Butterfield Road | MNT-VISKA | Dec 15, 2025 |
Whois
Registration for this announcement
- Range
- 137.
239. 221. 0/ 24 - Netname
- R89860
- Registrant
- Viskase Companies, Inc.
- Organization
- Viskase Companies, Inc. (VISKA)
- Org address
- 333 E Butterfield Road, Lombard, IL, 60148
- Org country
- US
- Type
- Reassigned
- Handle
- NET-137-239-221-0-1
- Parent
- NET-137-239-192-0-1
- Created
- May 1, 2025
- RIR
- ARIN
- Country
- US
- Delegated
- Jun 14, 2022
- Status
- assigned
Report abuse
Abuse contact
- abuse@
viskase. com - Name
- abuse
- Phone
- +1-630-874-0695
- Handle
- ABUSE1547-ARIN