172.236.139.121
172.236.139.121 is an IPv4 address operated by Linode (AS63949), with approximate network location Singapore, Singapore. It belongs to datacenter or hosting infrastructure with reverse DNS name 172-236-139-121.ip.linodeusercontent.com. As of November 11, 2026, IPDebrief rates it Low Risk (0/100); no anonymizing service was detected.
🏢 Ownership & Registration
| Registered holder | Linode |
| ASN | AS63949 |
| Network Name | LINODE |
| CIDR Block | 172.232.0.0/13 |
| RIR | ARIN |
| Network registration country | United States |
| Abuse Contact | Available via RDAP |
🌐 DNS Intelligence
| PTR | 172-236-139-121.ip.linodeusercontent.com |
| Forward Confirmed | Yes — FCrDNS verified |
| Forward Hostnames | 172-236-139-121.ip.linodeusercontent.com |
DNS Posture
Results describe the queried names. SPF, DMARC and CAA are domain policies, not requirements for every IP. DNSSEC here describes reverse DNS; inconclusive validation does not mean unsigned.
Not assessed: 0 conclusive IP DNS checks.
| spf | Not checked |
| dmarc | Not checked |
| fcrDns | Not checked |
| dnssec | Not checked |
| caa | Not checked |
☁️ Network Classification
| Infrastructure | Infrastructure / Datacenter |
| Service Purpose | Single-Service Host |
| Network Tier | Hosting — Infrastructure provider without advanced routing |
🔌 Services & Open Ports
| Port | Service | Protocol | Banner |
|---|---|---|---|
| 22 | ssh | tcp | Banner detected |
| Closed Ports | 25, 80, 443, 3389, 8080, 8443 (1 open / 7 scanned) | ||
| Server | — |
| HTTP Title | — |
🔐 TLS Certificate
| SANs | None |
| Valid From | — |
| Valid Until | — |
🛡️ Public Network Snapshot
| Origin ASN | AS63949 |
| Network Prefix | 172.236.128.0/19 |
| Route mapping | Found |
🎯 Confidence Breakdown
Per-dimension confidence scores based on source diversity and data freshness
| Dimension | Score | Sources | Observations |
|---|---|---|---|
| threat | 33% | 2 | 5 |
| routing | 8% | 1 | 1 |
| services | 25% | 2 | 3 |
| ownership | 23% | 2 | 4 |
| reputation | 25% | 1 | 4 |
| geolocation | 28% | 2 | 4 |
| Overall | 23% | 10 | 21 |
| Data Coherence | Consistent (100%) |
| Attribution | Moderate (70%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Stale
| First Seen | 2026-07-12 21:06:23 UTC |
| Last Seen | 2026-10-06 10:42:59 UTC |
| Profile Built | 2026-11-11 18:14:39 UTC |
| Data Freshness | Stale |
| Signal Types | 23 |
| Total Observations | 24 |
Full dossier details are available via our API.
❓ Frequently Asked Questions About 172.236.139.121
Who owns the IP address 172.236.139.121?
172.236.139.121 is registered to Linode. The address falls within the 172.232.0.0/13 network block. Registration is held at ARIN.
Where is 172.236.139.121 located?
Geolocation data places 172.236.139.121 in Singapore. IP geolocation is approximate, not a precise physical address. Registration country and certificate organization addresses do not establish service location.
Is 172.236.139.121 malicious or safe?
172.236.139.121 currently carries a low risk assessment, meaning no significant threat indicators have been observed. This assessment is generated from continuously collected signals and can change over time.
What is the hostname for 172.236.139.121?
The reverse DNS (PTR) record for 172.236.139.121 is 172-236-139-121.ip.linodeusercontent.com. This hostname is forward-confirmed, meaning it resolves back to the same address.
What ports are open on 172.236.139.121?
Responsive ports observed on 172.236.139.121 include 22. Port visibility reflects the most recent scan and may change as the host's configuration or firewall rules change.
Is 172.236.139.121 a VPN, proxy, or data center address?
172.236.139.121 is classified as cloud infrastructure and hosting infrastructure based on network ownership and behavioural analysis.