AS overview
Test target: 2a05:c900::1 · static prefix probe · address space: PA · prefixes announced: 1
prefix(es): 2a05:c900::/32
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 | ||
2a05:c900::1 | prb | ✓ | ✓ | ? | ? | ✓ | ✓ | ✓ | refused | refused | ✓ | ✓ | ✓ | refused | refused | ✓ |
RPKI & ASPA
0 of 1 prefix(es) covered by a valid ROA, 1 not-found.
| Prefix | RPKI state | Reason | Covering VRP(s) |
|---|---|---|---|
2a05:c900::/32 | - not-found | no covering VRP |
Random-IP probe (yarrp) into the AS' prefixes
We probed 15 arbitrary IPv6 address(es) inside AS42463's announced prefix(es). No router inside the prefix responded. The deepest visible hop was 2001:7f8:10::4:2463 at hop 9 - that router does not answer ICMPv6 Echo. This is not in AS42463's announced prefix; operationally it's the AS-edge / peering interface (often on an IXP 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 2026-05-30T12:45:39Z
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 | 1.6ms | 0% | AS203993 | STEFFANN-DC-AS - S.J.M. Steffann, NL |
| 2 | gw.friends.steffann.nl 2a00:8642:1000:f000::1 | 2.0ms | 0%* | AS203993 | STEFFANN-DC-AS - S.J.M. Steffann, NL |
| 3 | 2a00:1ca8:1::194 | 2.7ms | 30% | AS50673 | Serverius-as - Serverius Holding B.V., NL |
| 4 | 2a03:3f40::10:33 | 4.7ms | 0% | AS50673 | Serverius-as - Serverius Holding B.V., NL |
| 5 | 2a02:2d8:1:a001:232a | 4.2ms | 0% | - | |
| 6 | RT.NMX.ROM.IT.retn.net 2a02:2d8::57f5:e08f | 28.6ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 7 | 2a02:2d8:4:2803:232a::1 | 28.6ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 8 | 2a05:c900::1 | 29.0ms | - | AS42463 | AS-AGESCI - AS-AGESCI, IT |
Rate-limited ICMPv6: hop 3 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.032ms pmtu 1500
1: 2a00:8642:42::3 1.569ms
1: 2a00:8642:42::3 1.664ms
2: gw.friends.steffann.nl 2.400ms
3: 2a00:1ca8:1::194 3.382ms
4: 2a03:3f40::10:33 5.491ms
5: ae1-499.RT.SRV.DRO.NL.retn.net 4.815ms
6: RT.NMX.ROM.IT.retn.net 29.146ms
7: 2a05:c900::1 28.642ms reached
Resume: pmtu 1500 hops 7 back 7 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 | - | AS204471 | KARSOLINK - 2S Computers SRL, IT |
| 2 | * | - | 0%* | - | |
| 3 | 2a12:d8c0:101f:103::1 | 8.4ms | 0% | AS204471 | KARSOLINK - 2S Computers SRL, IT |
| 4 | 2a02:2d8:1:b80d:232a | 7.8ms | 0% | - | |
| 5 | RT.NMX.ROM.IT.retn.net 2a02:2d8::57f5:e08f | 14.7ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 6 | 2a05:c900::1 | 14.9ms | 0% | AS42463 | AS-AGESCI - AS-AGESCI, IT |
tracepath -6
1?: [LOCALHOST] 0.036ms pmtu 1500
1: no reply
2: no reply
3: 2a12:d8c0:101f:103::1 9.127ms
4: ae8-202.rt.clr.mil.it.retn.net 8.354ms asymm 5
5: rt.nmx.rom.it.retn.net 15.545ms
6: 2a05:c900::1 15.345ms reached
Resume: pmtu 1500 hops 6 back 6 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 | * | - | - | - | |
| 4 | e0-1.core1.lju1.he.net 2001:470:1:5be::1 | 2.5ms | 0% | AS6939 | HURRICANE - Hurricane Electric LLC, US |
| 5 | * | - | - | - | |
| 6 | port-channel1.core1.zag2.he.net 2001:470:0:2ea::2 | 4.2ms | 40% | AS6939 | HURRICANE - Hurricane Electric LLC, US |
| 7 | * | - | - | - | |
| 8 | e0-36.core2.rom1.he.net 2001:470:0:4d4::2 | 21.2ms | 0% | AS6939 | HURRICANE - Hurricane Electric LLC, US |
| 9 | 2a05:c900::1 | 34.4ms | 0% | AS42463 | AS-AGESCI - AS-AGESCI, IT |
Rate-limited ICMPv6: hop 6 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.041ms pmtu 1500
1: fw1-lju.6connect.com 0.671ms
1: fw1-lju.6connect.com 0.502ms
2: ccr-to-fw-ccr1-gw-lju.6connect.com 0.689ms
3: 2a03:a100:0:201:1::1 1.048ms
4: e0-1.core1.lju1.he.net 2.129ms
5: no reply
6: port-channel1.core1.zag2.he.net 4.356ms
7: no reply
8: e0-36.core2.rom1.he.net 21.506ms
9: 2a05:c900::1 21.525ms reached
Resume: pmtu 1500 hops 9 back 10