AS overview
Test target: 2a06:f940:1::1 · static prefix probe · address space: PA · prefixes announced: 2
prefix(es): 2a06:f940:1::/48, 2a06:f940:2::/48
Targets & per-vantage-point probe results (1 target(s) across 3 vantage point(s))
Source codes (hover any badge for full description): CUR=curated · NS/SOA/MX=DNS records · SPF=SPF TXT · DRV=holder-derived (www, ns1, mail, gw, …) · ATL=RIPE Atlas · PDB=PeeringDB · WHOIS=RIPE whois · RDAP=RIPE RDAP · HIT=IPv6 Hitlist · RTR=in-prefix path hop (router) · PRB=static prefix probe · SYN=synthetic prefix::1 fallback
| Target IP / hostname | Source | NL host (go6lab) | ITA host (Karsolink) | SLO host (6connect) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ping | 1500B | :80 | :443 | reached | ping | 1500B | :80 | :443 | reached | ping | 1500B | :80 | :443 | reached | ||
2a06:f940:1::1 | prb | ✓ | ✓ | ? | open | ✓ | ✓ | ✓ | refused | open | ✓ | ✓ | ✓ | refused | open | ✓ |
RPKI & ASPA
2 of 2 prefix(es) covered by a valid ROA.
| Prefix | RPKI state | Reason | Covering VRP(s) |
|---|---|---|---|
2a06:f940:1::/48 | ✓ valid | matched VRP (correct origin, length within maxLength) | AS203466 /48 maxLen 48 (ripe) |
2a06:f940:2::/48 | ✓ valid | matched VRP (correct origin, length within maxLength) | AS203466 /48 maxLen 48 (ripe) |
Random-IP probe (yarrp) into the AS' prefixes
We probed 30 arbitrary IPv6 address(es) inside AS203466's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:978:2:2c::81 at hop 24 - that router answers ICMPv6 Echo. This is not in AS203466's announced prefix; operationally it's the AS-edge / peering interface (often on a SIX peering address or an upstream's /127 link). The traceroute boundary is the AS edge: ICMPv6 Time-Exceeded responses from anything inside this AS are filtered.
ICMPv6 Type 2 (Packet Too Big) acceptance - active test
Type 2 honored. Forged ICMPv6 PTB (MTU=1280) was accepted by the destination's stack: the next 1500-byte Echo Reply arrived split into 2 fragments via the IPv6 Fragment Header.
method: ICMPv6 Echo + forged PTB, tested 2026-05-30T10:35:30Z
From NL host (go6lab) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | 2a00:8642:42::3 | 1.7ms | 0% | AS203993 | STEFFANN-DC-AS - S.J.M. Steffann, NL |
| 2 | gw.friends.steffann.nl 2a00:8642:1000:f000::1 | 5.8ms | - | AS203993 | STEFFANN-DC-AS - S.J.M. Steffann, NL |
| 3 | 2a00:1ca8:1::194 | 4.7ms | 0% | AS50673 | Serverius-as - Serverius Holding B.V., NL |
| 4 | 2a03:3f40::10:41 | 4.5ms | 0% | AS50673 | Serverius-as - Serverius Holding B.V., NL |
| 5 | * | - | 80% | - | |
| 6 | be3457.ccr41.ams03.atlas.cogentco.com 2001:550:0:1000::8275:109 | 3.8ms | - | AS174 | COGENT-174 - Cogent Communications, LLC, US |
| 7 | be3343.ccr41.fra05.atlas.cogentco.com 2001:550:0:1000::9a36:3e8d | 11.7ms | 0% | AS174 | COGENT-174 - Cogent Communications, LLC, US |
| 8 | be5485.rcr31.fra06.atlas.cogentco.com 2001:550:0:1000::9a36:4d36 | 12.5ms | 0% | AS174 | COGENT-174 - Cogent Communications, LLC, US |
| 9 | be4167.nr21.b015759-0.fra06.atlas.cogentco.com 2001:550:0:1000::9a19:3b2 | 13.7ms | 0% | AS174 | COGENT-174 - Cogent Communications, LLC, US |
| 10 | 2001:978:2:42::1d | 11.7ms | 0% | AS174 | COGENT-174 - Cogent Communications, LLC, US |
| 11 | ae1-0.gw01.fra01.net.23m.com 2a00:f48:100:0:8000::32 | 10.8ms | 0% | AS47447 | TTM - 23M GmbH, DE |
| 12 | v6.gw.de.introserv.net 2a06:f940:1::1 | 14.2ms | 0% | AS203466 | INTROSERV - INTROSERV d.o.o, SI |
Rate-limited ICMPv6: hop 5 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.036ms pmtu 1500
1: 2a00:8642:42::3 1.302ms
1: 2a00:8642:42::3 1.168ms
2: no reply
3: 2a00:1ca8:1::194 2.936ms
4: 2a03:3f40::10:41 2.311ms
5: no reply
6: no reply
7: be3343.ccr41.fra05.atlas.cogentco.com 11.946ms
8: be5485.rcr31.fra06.atlas.cogentco.com 11.639ms
9: be3023.nr21.b015759-0.fra06.atlas.cogentco.com 12.388ms
10: 2001:978:2:42::1d 21.038ms asymm 7
11: ae2-0.gw01.fra01.net.23m.com 11.253ms asymm 8
12: v6.gw.de.introserv.net 11.028ms reached
Resume: pmtu 1500 hops 12 back 9 From ITA host (Karsolink) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | karsolink-01.net.karsolink.com 2a12:d8c0:105a:9001::1 | 0.4ms | 0%* | AS204471 | KARSOLINK - 2S Computers SRL, IT |
| 2 | 2a12:d8c0:109f:121::a1 | 0.4ms | 0%* | AS204471 | KARSOLINK - 2S Computers SRL, IT |
| 3 | * | - | 80% | - | |
| 4 | 2a03:b020:1:51::a | 10.1ms | 0% | AS41327 | FIBERTELECOM-AS - Fiber Telecom S.p.A., IT |
| 5 | 2a03:b020::224 | 18.8ms | 0% | AS41327 | FIBERTELECOM-AS - Fiber Telecom S.p.A., IT |
| 6 | decix.bb01.net.23m.com 2001:7f8::b957:0:2 | 17.5ms | 0% | - | NA |
| 7 | ae1-0.gw01.fra01.net.23m.com 2a00:f48:100:0:8000::32 | 17.4ms | 0% | AS47447 | TTM - 23M GmbH, DE |
| 8 | v6.gw.de.introserv.net 2a06:f940:1::1 | 17.2ms | 0% | AS203466 | INTROSERV - INTROSERV d.o.o, SI |
Rate-limited ICMPv6: hop 3 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.029ms pmtu 1500
1: karsolink-01.net.karsolink.com 0.972ms
2: 2a12:d8c0:109f:121::a1 1.101ms
3: 2a12:d8c0:101f:6::1 10.200ms
4: 2a03:b020:1:51::a 11.060ms
5: 2a03:b020::224 19.682ms
6: decix.bb01.net.23m.com 21.986ms
7: ae1-0.gw01.fra01.net.23m.com 21.289ms
8: v6.gw.de.introserv.net 17.527ms reached
Resume: pmtu 1500 hops 8 back 8 From SLO host (6connect) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | fw1-lju.6connect.com 2607:fae0:a000::2 | 0.3ms | 0%* | AS8038 | 6CONNECT - 6connect, Inc., US |
| 2 | * | - | - | - | |
| 3 | 2a03:a100:0:201:1::1 | 0.6ms | - | AS56635 | XENYA - XENYA inzeniring, proizvodnja in trgovina, d.o.o. Ljubljana, SI |
| 4 | e0-1.core1.lju1.he.net 2001:470:1:5be::1 | 1.9ms | 0% | AS6939 | HURRICANE - Hurricane Electric LLC, US |
| 5 | 100ge0-0-0-5.core1.vie1.he.net 2001:470:0:578::1 | 8.4ms | 0% | AS6939 | HURRICANE - Hurricane Electric LLC, US |
| 6 | 100ge0-0-0-19.core2.fra2.he.net 2001:470:0:7ef::1 | 19.3ms | 0% | AS6939 | HURRICANE - Hurricane Electric LLC, US |
| 7 | 2001:7f8:15e::80 | 17.0ms | 0% | - | NA |
| 8 | ae3-0.bb01.fra01.net.23m.com 2a00:f48:100:0:8000::3d | 16.7ms | 0% | AS47447 | TTM - 23M GmbH, DE |
| 9 | ae2-0.gw01.fra01.net.23m.com 2a00:f48:100:0:8000::34 | 17.1ms | 0% | AS47447 | TTM - 23M GmbH, DE |
| 10 | v6.gw.de.introserv.net 2a06:f940:1::1 | 16.8ms | 0% | AS203466 | INTROSERV - INTROSERV d.o.o, SI |
tracepath -6
1?: [LOCALHOST] 0.031ms pmtu 1500
1: fw1-lju.6connect.com 0.740ms
1: fw1-lju.6connect.com 0.675ms
2: no reply
3: 2a03:a100:0:201:1::1 1.817ms
4: e0-1.core1.lju1.he.net 3.259ms
5: 100ge0-0-0-5.core1.vie1.he.net 7.937ms
6: 100ge0-0-0-19.core2.fra2.he.net 19.180ms asymm 7
7: 2001:7f8:15e::80 16.957ms
8: ae4-0.bb02.fra01.net.23m.com 17.385ms
9: ae1-0.gw01.fra01.net.23m.com 16.772ms
10: v6.gw.de.introserv.net 16.954ms reached
Resume: pmtu 1500 hops 10 back 11