128.31.0.71
Reputation · trust score
A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.
- Baseline (neutral) 65
- Long-established allocation (43y) +6
- Not on any threat blocklist +5
- Has a reverse-DNS (PTR) record +5
- Trust score 81 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
DNS records
- Reverse DNS (PTR)
- email.haystack.csail.mit.edu
- Forward-confirmed (FCrDNS)
- Not checked
- PTR TTL
- 1800 s
- Reverse DNS last checked
- 2026-09-20 19:11 UTC
Forward DNS records for email.haystack.csail.mit.edu
| Type | Value | Priority | TTL |
|---|---|---|---|
| A | 128.31.0.71 | — | 1800s |
| MX | email.haystack.csail.mit.edu | 1 | — |
Reverse & forward DNS collected by the WorldIP scanner fleet — FCrDNS confirms the PTR hostname resolves back to this IP.
Network Allocation for 128.31.0.71
- CIDR range
- 128.31.0.0/29
- IP range (int)
- 2,149,515,264 — 2,149,515,271
- Prefix length
- /29
- Organization
- Massachusetts Institute of Technology
- ASN
- AS3
- ASN name
- Massachusetts Institute of Technology
- Location
- Cambridge, Massachusetts, United States
- Coordinates
- 37.751000, -97.822000
- Accuracy radius
- 1000 km
- Postal code
- 02139
- Regional Internet Registry
- ARIN
- Allocated
- 1983-05-27
- Data source(s)
- maxmind_city, maxmind_country, maxmind_asn, ipinfo_lite
- Last updated
- 2026-07-09 06:19:03
BGP Routing
Live BGP anomalies →Origin AS announcing the most-specific prefix that covers this IP, observed across our RIPE RIS collectors.
RIR Ownership History
Atom feed ⇲Allocation changes captured weekly from regional internet registry (RIR) delegation files for ranges that have contained this IP.
| Date | Event | From | To |
|---|---|---|---|
| 2026-05-10 | New Allocation | — | US |
See the full history for 128.30.0.0/15.
Frequently Asked Questions
Who owns 128.31.0.71?
128.31.0.71 is allocated to Massachusetts Institute of Technology (AS3), registered in Cambridge, United States.
Where is 128.31.0.71 located?
The geolocation for 128.31.0.71 maps to Cambridge, United States based on MaxMind GeoLite2 data. Accuracy depends on the provider and may represent the ISP's regional hub rather than the exact endpoint.
What network is 128.31.0.71 on?
128.31.0.71 belongs to the 128.31.0.0/29 network block announced by AS3. This range contains 8 addresses.
Does 128.31.0.71 have a reverse DNS record?
Reverse DNS (PTR) records are resolved live when you visit this page. If a PTR record exists, it appears in the Reverse DNS field above. PTR records map IP addresses back to hostnames and are commonly used for email authentication and network diagnostics.
Neighbors
Other addresses in the same /24.
