Data as of Nov 9, 2026
207.75.144.0/20
No anonymizer space · no proxy exits in 30 daysUniversity of Michigan · space held by Merit Network Inc.
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Proxy exits | Holder | RPKI |
|---|---|---|---|---|---|
| 207.72.0.0/14 since May 2005 | AS237 | Business | 37 2 always on | Merit Network 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 |
|---|---|---|---|---|---|---|
| 207.72.0.0/14 | 262,144 | MICH-120 | Merit Network Inc. (MICH-Z) · US | Direct Allocation | Feb 29, 1996 | abuse@ |
| └ 207.75.144.0/20 | 4,096 | MICH-121 | University of Michigan (UNIVER-118) · US | Reassigned | Jun 4, 1998 | — |
Network & registry
IPv4 market
Holder
- Organization
- Merit Network Inc.
- Handle
- MICH-Z
- Range
- 207.
72. 0. 0/ 14 - Registration type
- Direct Allocation
- Record created
- Feb 29, 1996
- Legacy
- yes
Origin network
AS36375
US
- Name
- University of Michigan
- Type
- Education
- Registered
- Dec 16, 2005
- Domain
- umich.edu
- Industry
- Education Software
- Spamhaus ASN-DROP
- not listed
- Tor exits
- 1
Routing timeline
Covering aggregate above, the prefix's own history below
Summary
Routing history
- First seen
- Before our records
- Origin networks
- 1
RPKI
Route origin authorizations
| ROA prefix | ASN | Max len | Anchor | Verdict |
|---|---|---|---|---|
| 207.75.144.0/20 | AS36375 | /20 | ARIN | RPKI valid |
| 207.72.0.0/14 | AS237 | /14 | ARIN | Another network |
IRR
Route objects on the exact prefix
| Origin | Registry | Description | Maintainer | Modified |
|---|---|---|---|---|
| AS36375 | RADB | University of Michigan | MAINT-AS36375 | Nov 13, 2023 |
Whois
Registration for this announcement
- Range
- 207.
75. 144. 0/ 20 - Netname
- MICH-121
- Registrant
- University of Michigan
- Organization
- University of Michigan (UNIVER-118)
- Org address
- IT Communications Services, Ann Arbor, MI, 48105-3640
- Org country
- US
- Type
- Reassigned
- Handle
- NET-207-75-144-0-1
- Parent
- NET-207-72-0-0-1
- Created
- Jun 4, 1998
- RIR
- ARIN
- Country
- US
- Delegated
- Feb 29, 1996
- Status
- assigned
Report abuse
Abuse contact
- report-abuse@
umich. edu - Name
- IT Abuse Investigation
- Phone
- +1-734-764-4357
- Handle
- IAI8-ARIN