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 7 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 | SRB host (SOX, Belgrade) | DE host (Berlin) | DE host (Düsseldorf) | NL host (go6lab) | ITA host (Karsolink) | SLO host (6connect) | SLO host (T-2) | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ping | 1500B | :80 | :443 | reached | ping | 1500B | :80 | :443 | reached | ping | 1500B | :80 | :443 | reached | ping | 1500B | :80 | :443 | reached | ping | 1500B | :80 | :443 | reached | ping | 1500B | :80 | :443 | reached | ping | 1500B | :80 | :443 | reached | ||
2a05:c900::1 | prb | ✓ | ✓ | refused | refused | ✓ | ✓ | ✓ | refused | refused | ✓ | ✓ | ✓ | refused | refused | - | ✓ | ✓ | ? | ? | ✓ | ✓ | ✓ | refused | refused | - | ✓ | ✓ | refused | refused | ✓ | ✓ | ✓ | refused | refused | ✓ |
RPKI & ASPA
1 of 1 prefix(es) covered by a valid ROA.
| Prefix | RPKI state | Reason | Covering VRP(s) |
|---|---|---|---|
2a05:c900::/32 | ✓ valid | matched VRP (correct origin, length within maxLength) | AS42463 /32 maxLen 32 (ripe) |
Random-IP probe (yarrp) into the AS' prefixes
We probed 35 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 12 - 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 2026-09-23T12:04:44Z
Multi-vantage path map
Every hop of all vantages’ traceroutes toward the target, drawn left→right, grouped into per-AS bubbles (a hop seen from several vantages is one shared bubble, so converging paths merge). It answers two questions per vantage — shown on each source bubble as echo ✓/⚠/✗ · trace ✓/✗: did the destination reply to ICMPv6 Echo (✓ honored, ⚠ replied but PTB not honored, ✗ no reply), and did the traceroute reach it. A line to the target is drawn only when that vantage got an echo reply — solid if the PTB was honored, dashed if not (reachable but a broken-PMTUD / RFC 4890 violation). The path depth still shows how far the traceroute itself got, and runs of unanswered (* *) hops collapse into one dashed “silent” bubble. Open full size ↗
- ● SRB host (SOX, Belgrade)
- ● DE host (Berlin)
- ● DE host (Düsseldorf)
- ● NL host (go6lab)
- ● ITA host (Karsolink)
- ● SLO host (6connect)
- ● SLO host (T-2)
- ── solid line = echo reply, PTB honored (clean reach)
- — — dashed line = echo reply but PTB not honored (RFC 4890 violation)
- no line = no echo reply (never reached)
- ◉ target: green = clean, amber = reachable-but-violation / unreachable
- ⚠ suspected drop AS
- ⋯ silent (unanswered) hops
- ● IXP hop
From SRB host (SOX, Belgrade) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | 2a09:ab81::1 | 0.4ms | 0%* | AS60733 | PERKE-NET - ZORAN PEROVIC trading as Agencija Perke.NET, RS |
| 2 | 2001:7f8:1e::4 | 0.7ms | 0% | AS13004 | SOX - Serbian Open Exchange DOO, RS |
| 3 | 2001:7f8:30:0:2:1:0:9002 | 12.9ms | 0% | - | NA |
| 4 | RT.NMX.ROM.IT.retn.net 2a02:2d8::57f5:e08f | 27.2ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 5 | 2a05:c900::1 | 27.7ms | 0% | AS42463 | AS-AGESCI - AS-AGESCI, IT |
tracepath -6
1?: [LOCALHOST] 0.013ms pmtu 1500
1: _gateway 0.574ms
1: _gateway 0.610ms
2: 2001:7f8:1e::4 0.931ms
3: 2001:7f8:30:0:2:1:0:9002 35.471ms
4: RT.NMX.ROM.IT.retn.net 27.618ms
5: 2a05:c900::1 27.835ms reached
Resume: pmtu 1500 hops 5 back 5 From DE host (Berlin) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | xe-0-0-13-178.gw01.ber01.as59645.net 2a06:d1c1:100:b::1 | 0.3ms | 0%* | AS59645 | WYBT-NET - Tobias Fiebig, DE |
| 2 | ae0-2453.cr10.ber01.lwlcom.net 2a06:d1c0::dead:beef:1c02 | 19.5ms | 0%* | AS59645 | WYBT-NET - Tobias Fiebig, DE |
| 3 | retn.bcix.de 2001:7f8:19:1::232a:1 | 10.6ms | 0% | - | NA |
| 4 | RT.NMX.ROM.IT.retn.net 2a02:2d8::57f5:e08f | 28.9ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 5 | 2a05:c900::1 | 29.2ms | 0% | AS42463 | AS-AGESCI - AS-AGESCI, IT |
tracepath -6
1?: [LOCALHOST] 0.025ms pmtu 1500
1: xe-0-0-13-178.gw01.ber01.as59645.net 6.948ms
1: xe-0-0-13-178.gw01.ber01.as59645.net 0.623ms
2: ae0-2453.cr10.ber01.lwlcom.net 1.240ms
3: retn.bcix.de 10.830ms asymm 5
4: RT.NMX.ROM.IT.retn.net 28.750ms asymm 5
5: 2a05:c900::1 29.717ms reached
Resume: pmtu 1500 hops 5 back 6 From DE host (Düsseldorf) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | xe-0-0-12-142.gw01.dus01.as59645.net 2a06:d1c1:100:d::1 | 0.2ms | 0%* | AS59645 | WYBT-NET - Tobias Fiebig, DE |
| 2 | eth1-0-12-h5594.edge5-dus1.bb.wiit.network 2001:4ba0:92f4:3::1 | 0.8ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 3 | lag13.agr3-dus3.bb.wiit.network 2001:4ba0:ffe9:7d::1 | 7.3ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 4 | lag30.core3-dus1.bb.wiit.network 2001:4ba0:ffe9:109::2 | 0.2ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 5 | lag8.core1-dus-ix.bb.wiit.network 2001:4ba0:ffe9:8::2 | 0.4ms | 0% | AS24961 | MYLOC-AS - WIIT AG, DE |
| 6 | de-cix1.rt.act.fkt.de.retn.net 2001:7f8::232a:0:1 | 4.6ms | 0% | - | NA |
| 7 | RT.NMX.ROM.IT.retn.net 2a02:2d8::57f5:e08f | 22.9ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 8 | 2a02:2d8:4:2803:232a::1 | 22.4ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
tracepath -6
1?: [LOCALHOST] 0.016ms pmtu 1500
1: xe-0-0-12-142.gw01.dus01.as59645.net 0.347ms
1: xe-0-0-12-142.gw01.dus01.as59645.net 0.268ms
2: eth1-0-12-h5594.edge5-dus1.bb.wiit.network 1.412ms
3: no reply
4: lag11.core3-dus1.bb.wiit.network 0.520ms
5: lag8.core1-dus-ix.bb.wiit.network 0.578ms
6: de-cix1.rt.act.fkt.de.retn.net 4.533ms asymm 4
7: RT.NMX.ROM.IT.retn.net 22.536ms asymm 4
8: 2a02:2d8:4:2803:232a::1 22.905ms asymm 6
9: 2a05:c900::1 23.339ms reached
Resume: pmtu 1500 hops 9 back 5 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::2 | 1.4ms | 0% | AS203993 | GNA-DC1-AS - S.J.M. Steffann, NL |
| 2 | * | - | 0%* | - | |
| 3 | ccr2-ccr1.dc1.nogalliance.org 2a00:8642:dc1:2::b | 2.5ms | 40% | AS203993 | GNA-DC1-AS - S.J.M. Steffann, NL |
| 4 | ams-ix.retn.net 2001:7f8:1::a500:9002:1 | 8.9ms | 0% | - | NA |
| 5 | RT.NMX.ROM.IT.retn.net 2a02:2d8::57f5:e08f | 30.9ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 6 | 2a05:c900::1 | 49.9ms | 0% | 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] 0.039ms pmtu 1500
1: 2a00:8642:42::2 2.888ms
1: 2a00:8642:42::2 3.788ms
2: gw.friends.steffann.nl 5.671ms
3: ccr2-ccr1.dc1.nogalliance.org 3.304ms asymm 2
4: ams-ix.retn.net 8.295ms asymm 7
5: RT.NMX.ROM.IT.retn.net 32.980ms asymm 6
6: 2a02:2d8:4:2803:232a::1 30.397ms asymm 8
7: 2a05:c900::1 29.920ms 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 | 0%* | AS204471 | KARSOLINK - 2S Computers SRL, IT |
| 2 | 2a12:d8c0:109f:121::a1 | 0.4ms | - | AS204471 | KARSOLINK - 2S Computers SRL, IT |
| 3 | 2a12:d8c0:101f:103::1 | 8.4ms | 40% | AS204471 | KARSOLINK - 2S Computers SRL, IT |
| 4 | 2a02:2d8:4:1815:232a | 30.8ms | 0% | - | |
| 5 | RT.NMX.ROM.IT.retn.net 2a02:2d8::57f5:e08f | 14.1ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
| 6 | 2a02:2d8:4:2803:232a::1 | 10.1ms | 0% | AS9002 | RETN-AS - RETN Limited, GB |
Rate-limited ICMPv6: hop 3 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.084ms pmtu 1500
1: no reply
2: 2a12:d8c0:109f:121::a1 0.869ms
3: 2a12:d8c0:101f:103::1 8.624ms
4: ae8-202.RT.CLR.MIL.IT.retn.net 8.061ms asymm 5
5: RT.NMX.ROM.IT.retn.net 10.548ms
6: 2a02:2d8:4:2803:232a::1 14.766ms asymm 7
7: 2a05:c900::1 10.925ms reached
Resume: pmtu 1500 hops 7 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 | * | - | 0% | - | |
| 4 | * | - | 30% | - | |
| 5 | * | - | - | - | |
| 6 | port-channel1.core1.zag2.he.net 2001:470:0:2ea::2 | 4.6ms | 10% | AS6939 | HURRICANE - Hurricane Electric LLC, US |
| 7 | * | - | - | - | |
| 8 | e0-36.core2.rom1.he.net 2001:470:0:4d4::2 | 21.1ms | 0% | AS6939 | HURRICANE - Hurricane Electric LLC, US |
| 9 | 2a05:c900::1 | 21.4ms | 0% | AS42463 | AS-AGESCI - AS-AGESCI, IT |
Rate-limited ICMPv6: hop 4, hop 6 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.021ms pmtu 9000
1: fw1-lju.6connect.com 0.605ms
1: fw1-lju.6connect.com 0.625ms
2: no reply
3: 2a03:a100:0:201:1::1 1.317ms
4: 2a03:a100:0:201:1::1 0.878ms pmtu 1500
4: no reply
5: no reply
6: port-channel1.core1.zag2.he.net 4.063ms
7: no reply
8: e0-36.core2.rom1.he.net 21.430ms
9: 2a05:c900::1 21.628ms reached
Resume: pmtu 1500 hops 9 back 10 From SLO host (T-2) openRFC 4890 ✓
filter likely at: (none) · min PMTU on path: 1500
Path (traceroute + mtr + PTR)
| # | IP / PTR | RTT | mtr loss | AS | AS holder |
|---|---|---|---|---|---|
| 1 | 2a01:261:313:b814::1 | 0.6ms | 0%* | AS34779 | T-2-AS - T-2, d.o.o., SI |
| 2 | 2a01:260:1::225 | 2.2ms | 0%* | AS34779 | T-2-AS - T-2, d.o.o., SI |
| 3 | 2a01-260-1-1--9c.core6.t-2.net 2a01:260:1:1::9c | 2.5ms | 0%* | AS34779 | T-2-AS - T-2, d.o.o., SI |
| 4 | hurricane-electric.nikhef.nlsix.net 2001:7f8:13::a500:6939:1 | 35.3ms | 0% | - | NA |
| 5 | * | - | 50% | - | |
| 6 | * | - | 80% | - | |
| 7 | be10.core1.zrh2.he.net 2001:470:e:153::2 | 45.5ms | 0% | AS6939 | HURRICANE - Hurricane Electric LLC, US |
| 8 | be1.core1.mil2.he.net 2001:470:e:dd::1 | 34.6ms | 0% | AS6939 | HURRICANE - Hurricane Electric LLC, US |
| 9 | * | - | - | - | |
| 10 | * | - | 0% | - | |
| 11 | e0-36.core2.rom1.he.net 2001:470:0:4d4::2 | 38.6ms | 0% | AS6939 | HURRICANE - Hurricane Electric LLC, US |
| 12 | 2a05:c900::1 | 37.7ms | - | AS42463 | AS-AGESCI - AS-AGESCI, IT |
Rate-limited ICMPv6: hop 5, hop 6 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).
tracepath -6
1?: [LOCALHOST] 0.030ms pmtu 1500
1: 2a01:261:313:b814::1 0.997ms
2: 2a01:260:1::225 2.941ms
3: 2a01-260-1-1--9a.core6.t-2.net 3.142ms
4: hurricane-electric.nikhef.nlsix.net 35.373ms
5: hurricane-electric.nikhef.nlsix.net 36.133ms asymm 4
6: be1.core2.fra2.he.net 37.113ms asymm 5
7: be10.core1.zrh2.he.net 44.919ms asymm 8
8: be10.core1.zrh2.he.net 44.977ms
9: be1.core1.mil2.he.net 33.916ms asymm 7
10: e0-36.core2.rom1.he.net 42.615ms asymm 7
11: 2a05:c900::1 39.350ms reached
Resume: pmtu 1500 hops 11 back 7