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
- Academic allocation +6
- Trust score 71 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
About Harvard University
Harvard University is a private Ivy League research university in Cambridge, Massachusetts, United States. Founded in 1636, and named Harvard College in 1639 in honor of its first benefactor, Puritan clergyman John Harvard, it is the oldest institution of higher learning in the United States.
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 128.103.0.0/16 | 65.5K |
25.2%
|
Harvard University | US | Massachusetts | Cambridge |
| 131.142.0.0/16 | 65.5K |
6.7%
|
Harvard University | US | Massachusetts | Arlington |
| 140.247.0.0/16 | 65.5K |
64.9%
|
Harvard University | US | Massachusetts | Cambridge |
| 65.112.0.0/20 | 4.1K |
7.2%
|
Harvard University | US | Massachusetts | Cambridge |
| 67.134.204.0/22 | 1.0K |
93.2%
|
Harvard University | US | Massachusetts | Medford |
| 199.94.60.0/22 | 1.0K |
0.0%
|
Harvard University | US | — | — |
| 192.5.66.0/24 | 256 |
0.8%
|
Harvard University | US | — | — |
| 192.54.223.0/24 | 256 |
0.0%
|
Harvard University | US | — | — |
| 192.131.102.0/24 | 256 |
0.0%
|
Harvard University | US | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS1742 actually originates in BGP, observed across our RIPE RIS collectors. This live routing view can differ from the registry allocation above.
| Prefix | Announcement samples | Last seen |
|---|---|---|
| 199.94.60.0/22 | 13,881 | 2026-09-11 16:23:46 |
| 67.134.204.0/22 | 7,689 | 2026-09-11 16:28:50 |
| 192.54.223.0/24 | 7,645 | 2026-09-11 16:23:46 |
| 192.5.66.0/24 | 7,643 | 2026-09-11 16:23:46 |
| 131.142.0.0/16 | 7,515 | 2026-09-11 16:29:29 |
| 65.112.0.0/20 | 7,008 | 2026-09-11 16:28:50 |
| 140.247.0.0/16 | 6,949 | 2026-09-11 16:29:22 |
| 192.131.102.0/24 | 6,943 | 2026-09-11 16:23:46 |
| 128.103.0.0/16 | 6,930 | 2026-09-11 16:29:22 |
| 140.247.174.0/24 | 3,589 | 2026-09-11 13:17:30 |
| 140.247.236.0/24 | 3,342 | 2026-09-11 13:17:30 |
| 140.247.152.0/24 | 3,284 | 2026-09-11 13:17:30 |
| 140.247.111.0/24 | 2,511 | 2026-09-11 13:17:30 |
| 140.247.179.128/26 | 92 | 2026-09-11 04:15:41 |
Frequently Asked Questions
What is AS1742?
AS1742 is an Autonomous System Number assigned to Harvard University. An ASN identifies a network that controls a specific set of IP addresses and determines how traffic is routed across the internet via BGP (Border Gateway Protocol).
How many IP addresses does AS1742 announce?
AS1742 announces 203.5K IPv4 addresses distributed across 9 routed CIDR prefixes. The network is registered in United States.
Who operates AS1742?
AS1742 is operated by Harvard University. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.
What country is AS1742 registered in?
AS1742 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
