90.181.66.137
90.181.66.137 is an IPv4 address announced by AS5610, with approximate network location Liberec, Czech Republic. It belongs to a mobile network with reverse DNS name 90-181-66-137.rco.o2.cz. As of November 12, 2026, IPDebrief rates it Low Risk (0/100); no anonymizing service was detected.
🏢 Ownership & Registration
| Registered holder | AS5610-MTN |
| ASN | AS5610 |
| Network Name | NEXTEL-XDSL |
| CIDR Block | 90.181.66.0/24 |
| RIR | RIPE |
| Network registration country | CZ |
| Abuse Contact | Available via RDAP |
🌐 DNS Intelligence
| PTR | 90-181-66-137.rco.o2.cz |
| Forward Confirmed | Yes — FCrDNS verified |
| Forward Hostnames | 90-181-66-137.rco.o2.cz |
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 | Mobile |
| Service Purpose | Firewalled / No Services |
| Network Tier | Unknown — Insufficient routing data to classify |
🔌 Services & Open Ports
| Port | Service | Protocol | Banner |
|---|---|---|---|
| No open ports detected | |||
| Closed Ports | 22, 25, 80, 443, 3389, 8080, 8443 (0 open / 7 scanned) | ||
| Server | — |
| HTTP Title | — |
🔐 TLS Certificate
| SANs | None |
| Valid From | — |
| Valid Until | — |
🛡️ Public Network Snapshot
| Origin ASN | AS5610 |
| Network Prefix | 90.181.0.0/16 |
| Route mapping | Found |
📅 Observation Timeline 🔄 Recent
| First Seen | 2026-11-06 01:27:18 UTC |
| Last Seen | 2026-11-08 02:09:46 UTC |
| Profile Built | 2026-11-12 19:35:10 UTC |
| Data Freshness | Recent |
| Signal Types | 13 |
| Total Observations | 13 |
Full dossier details are available via our API.
❓ Frequently Asked Questions About 90.181.66.137
Who owns the IP address 90.181.66.137?
90.181.66.137 is registered to AS5610-MTN. The address falls within the 90.181.66.0/24 network block. Registration is held at RIPE.
Where is 90.181.66.137 located?
Geolocation data places 90.181.66.137 in Liberec, Liberec Region, Czech Republic. The local time zone is Europe/Prague. IP geolocation is approximate, not a precise physical address. Registration country and certificate organization addresses do not establish service location.
Is 90.181.66.137 malicious or safe?
90.181.66.137 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 90.181.66.137?
The reverse DNS (PTR) record for 90.181.66.137 is 90-181-66-137.rco.o2.cz. This hostname is forward-confirmed, meaning it resolves back to the same address.
Is 90.181.66.137 a VPN, proxy, or data center address?
90.181.66.137 is classified as a mobile network based on network ownership and behavioural analysis.