81.19.4.101
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
- Long-established allocation (24y) +6
- Not on any threat blocklist +5
- Has a reverse-DNS (PTR) record +5
- Trust score 81 / 100
Experimental · trust-vectors model v1.2.1 — a transparent heuristic, not a definitive verdict. How it works →
DNS records
- Reverse DNS (PTR)
- mailer.sbcomp.cz
- Forward-confirmed (FCrDNS)
- Not checked
- PTR TTL
- 43200 s
- Reverse DNS last checked
- 2026-09-30 17:52 UTC
- Forward DNS last checked
- 2026-09-30 17:52 UTC
Forward DNS records for mailer.sbcomp.cz
| Type | Value | Priority | TTL |
|---|---|---|---|
| A | 81.91.86.11 | — | 172800s |
Reverse & forward DNS collected by the WorldIP scanner fleet — FCrDNS confirms the PTR hostname resolves back to this IP.
Reverse DNS history
How this IP's reverse DNS (PTR) has changed over time, from our scans.
This IP's reverse DNS changes frequently — the timeline below shows the most recent changes.
Reverse-DNS changes between Sep 28, 2026 and Sep 30, 2026 were not recorded; the current PTR is shown from its earliest retained observation.
- mailer.sbcomp.cz — since at least Sep 30, 2026 → present
- francouzska67.faster.cz — Sep 28, 2026 → Sep 30, 2026
- mailer.sbcomp.cz — Aug 18, 2026 → Sep 28, 2026
- francouzska67.faster.cz — Jul 5, 2026 → Aug 18, 2026
- mailer.sbcomp.cz — Jul 2, 2026 → Jul 5, 2026
- francouzska67.faster.cz — Jun 29, 2026 → Jul 2, 2026
- mailer.sbcomp.cz — Jun 14, 2026 → Jun 29, 2026
Network Allocation for 81.19.4.101
- CIDR range
- 81.19.0.0/21
- IP range (int)
- 1,360,199,680 — 1,360,201,727
- Prefix length
- /21
- Organization
- FASTER CZ spol. s r.o.
- ASN
- AS24641
- ASN name
- FASTER CZ spol. s r.o.
- Location
- Brno, South Moravian, Czechia
- Coordinates
- 49.195300, 16.601600
- Accuracy radius
- 5 km
- Postal code
- 602 00
- Regional Internet Registry
- RIPE
- Allocated
- 2002-01-22
- Data source(s)
- maxmind_asn, ipinfo_lite, maxmind_city, maxmind_country
- Last updated
- 2026-09-29 18:50:51
BGP Routing
Live BGP anomalies →Origin AS announcing the most-specific prefix that covers this IP, observed across our RIPE RIS collectors.
Frequently Asked Questions
Who owns 81.19.4.101?
81.19.4.101 is allocated to FASTER CZ spol. s r.o. (AS24641), registered in Brno, Czechia.
Where is 81.19.4.101 located?
The geolocation for 81.19.4.101 maps to Brno, Czechia 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 81.19.4.101 on?
81.19.4.101 belongs to the 81.19.0.0/21 network block announced by AS24641. This range contains 2,048 addresses.
Does 81.19.4.101 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.
