38.100.128.10
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
- Forward-confirmed reverse DNS (FCrDNS) +10
- Long-established allocation (35y) +6
- Not on any threat blocklist +5
- Trust score 86 / 100
Experimental · trust-vectors model v1.1.0 — a transparent heuristic, not a definitive verdict. How it works →
DNS records
- Reverse DNS (PTR)
- cogentco.com
- Forward-confirmed (FCrDNS)
- ✓ Confirmed
- PTR TTL
- 10800 s
- Reverse DNS last checked
- 2026-07-18 16:45 UTC
- Forward DNS last checked
- 2026-07-18 16:45 UTC
Forward DNS records for cogentco.com
| Type | Value | Priority | TTL |
|---|---|---|---|
| A | 38.100.128.10 | — | 7957s |
| AAAA | 2001:550:1::cc01 | — | 600s |
| MX | cogentco-com.mail.protection.outlook.com | 5 | — |
| NS | auth1.dns.cogentco.com | — | — |
| NS | auth2.dns.cogentco.com | — | — |
| TXT | 2btc923933rlmtmu3eie8bpc65 | — | — |
| TXT | ZOOM_verify_6LoiHccIcBeiFmEkJmfiR4 | — | — |
| TXT | adobe-idp-site-verification=f26b18445e54e1e7da0ebc2c299a9f1c63820cf9ab98c8be839829c2247503cc | — | — |
| TXT | cisco-ci-domain-verification=563e6ea9960b89d45e298278ab2c8f2ed5c7bea8277648dd997262491c1f4fd | — | — |
| TXT | cofnduj090qcu5jbup8c39bovo | — | — |
| TXT | ifs3oocjo6h5920nr11c1325f9 | — | — |
| TXT | v=DMARC1; p=none; | — | — |
| TXT | v=spf1 mx a:engtools.sys.cogentco.com a:mx1.cogentco.com a:mx2.cogentco.com a:mx3.cogentco.com a:mx4.cogentco.com a:mx5.cogentco.com ip6:2001:550:1:304::247 include:cvent-planner.com include:_spf.act-on.net ~all | — | — |
Reverse & forward DNS collected by the WorldIP scanner fleet — FCrDNS confirms the PTR hostname resolves back to this IP.
Network Allocation for 38.100.128.10
- CIDR range
- 38.100.128.0/29
- IP range (int)
- 644,120,576 — 644,120,583
- Prefix length
- /29
- Organization
- Cogent Communications, LLC
- ASN
- AS174
- ASN name
- Cogent Communications, LLC
- Location
- Washington, District Of Columbia, United States
- Coordinates
- 38.894000, -77.036500
- Accuracy radius
- 20 km
- Postal code
- 56972
- Regional Internet Registry
- ARIN
- Allocated
- 1991-04-16
- Data source(s)
- maxmind_city, ipinfo_lite, maxmind_country, maxmind_asn
- Last updated
- 2026-07-11 09:19:59
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 38.100.128.0/21.
Frequently Asked Questions
Who owns 38.100.128.10?
38.100.128.10 is allocated to Cogent Communications, LLC (AS174), registered in Washington, United States.
Where is 38.100.128.10 located?
The geolocation for 38.100.128.10 maps to Washington, 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 38.100.128.10 on?
38.100.128.10 belongs to the 38.100.128.0/29 network block announced by AS174. This range contains 8 addresses.
Does 38.100.128.10 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.
