121.199.0.21
121.199.0.21 is an IPv4 address operated by ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN (AS37963), with approximate network location Hangzhou, China. As of November 14, 2026, IPDebrief rates it Low Risk (0/100); no anonymizing service was detected.
Witness AI IP Assessment (AI-generated)
AI-generated assessment. Verify critical details independently.
The target host, 121.199.0.21/32, is part of the ALISOFT network (AS37963), allocated to Alibaba Cloud under the 121.196.0.0/14 CIDR block within the APNIC region. Geolocation data places the network in Hangzhou, Zhejiang, China. Automated assessment yielded a risk score of 0, though the DNS hygiene profile remains unassessed (score 0) with SPF, DMARC, and CAA checks marked as not checked or not applicable, and DNSSEC status unknown. Network role analysis indicates the host is likely firewalled with no active services, as probes to ports 443 and 8443 returned unreachable statuses. Anycast status is unverified. Due to the lack of active service responses and limited DNS validation data, the host is currently characterized as non-interactive; however, this does not definitively rule out latent malicious activity. Continued monitoring is recommended to observe future service activation or behavioral changes.
🏢 Ownership & Registration
| Registered holder | Unknown |
| ASN | AS37963 |
| Network Name | ALISOFT |
| CIDR Block | 121.196.0.0/14 |
| RIR | APNIC |
| Network registration country | CN |
| Routing operator | ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN |
| Abuse Contact | Available via RDAP |
🌐 DNS Intelligence
| PTR Record | No PTR |
| Forward Confirmed | No — PTR hostname does not resolve back to this IP (weak signal) |
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.
| caa | Not applicable |
| spf | Not checked |
| dmarc | Not checked |
| dnssec | Unknown / lookup inconclusive 21.0.199.121.in-addr.arpa |
| fcrDns | Not applicable |
☁️ Network Classification
| Infrastructure | Unknown |
| 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
| Port | Latest capture attempt |
|---|---|
| 443 | Certificate not captured; current certificate unknown (unreachable) |
| 8443 | Certificate not captured; current certificate unknown (unreachable) |
| SANs | None |
| Valid From | — |
| Valid Until | — |
🛡️ Public Network Snapshot
| Origin ASN | AS37963 |
| Network Prefix | 121.199.0.0/16 |
| Route mapping | Found |
🎯 Confidence Breakdown
Per-dimension confidence scores based on source diversity and data freshness
| Dimension | Score | Sources | Observations |
|---|---|---|---|
| threat | 25% | 2 | 3 |
| routing | 16% | 1 | 2 |
| services | 5% | 2 | 2 |
| ownership | 36% | 2 | 5 |
| reputation | 6% | 1 | 2 |
| geolocation | 7% | 2 | 3 |
| Overall | 16% | 10 | 17 |
| Data Coherence | Consistent (100%) |
| Attribution | Low (35%) |
| OwnershipFCrDNSGeo ConsensusGeo PlausibleIRR MatchRPKI Valid |
📅 Observation Timeline 🔄 Live
| First Seen | 2026-07-13 03:13:50 UTC |
| Last Seen | 2026-11-14 01:46:27 UTC |
| Profile Built | 2026-11-14 02:02:08 UTC |
| Data Freshness | Live |
| Signal Types | 20 |
| Total Observations | 29 |
Full dossier details are available via our API.
❓ Frequently Asked Questions About 121.199.0.21
Where is 121.199.0.21 located?
Geolocation data places 121.199.0.21 in Hangzhou, Zhejiang, China. The local time zone is Asia/Shanghai. IP geolocation is approximate, not a precise physical address. Registration country and certificate organization addresses do not establish service location.
Is 121.199.0.21 malicious or safe?
121.199.0.21 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.