The Border Gateway Protocol (BGP) is the protocol backing the core routing decisions on the Internet. It maintains a table of IP networks or 'prefixes' which designate network reachability among autonomous systems (AS). It is described as a path vector protocol. BGP does not use traditional Interior Gateway Protocol (IGP) metrics, but makes routing decisions based on path, network policies and/or rulesets. For this reason, it is more appropriately termed a reachability protocol rather than routing protocol.

Sunday, November 13, 2011

[bgp-stats] Routing Table Report - Japan view

* BGP Routing Table Analysis Reports *
Routing Table Report 04:00 +10GMT Mon 14 Nov, 2011

Report Website: http://thyme.rand.apnic.net
Detailed Analysis: http://thyme.rand.apnic.net/current/

Analysis Summary
----------------

BGP routing table entries examined: 381716
Prefixes after maximum aggregation: 166500
Deaggregation factor: 2.29
Unique aggregates announced to Internet: 187658
Total ASes present in the Internet Routing Table: 39283
Prefixes per ASN: 9.72
Origin-only ASes present in the Internet Routing Table: 32396
Origin ASes announcing only one prefix: 15480
Transit ASes present in the Internet Routing Table: 5268
Transit-only ASes present in the Internet Routing Table: 133
Average AS path length visible in the Internet Routing Table: 4.4
Max AS path length visible: 33
Max AS path prepend of ASN (48687) 24
Prefixes from unregistered ASNs in the Routing Table: 1698
Unregistered ASNs in the Routing Table: 882
Number of 32-bit ASNs allocated by the RIRs: 1946
Number of 32-bit ASNs visible in the Routing Table: 1619
Prefixes from 32-bit ASNs in the Routing Table: 3732
Special use prefixes present in the Routing Table: 3
Prefixes being announced from unallocated address space: 84
Number of addresses announced to Internet: 2490536960
Equivalent to 148 /8s, 114 /16s and 148 /24s
Percentage of available address space announced: 67.2
Percentage of allocated address space announced: 67.2
Percentage of available address space allocated: 100.0
Percentage of address space in use by end-sites: 91.6
Total number of prefixes smaller than registry allocations: 161392

APNIC Region Analysis Summary
-----------------------------

Prefixes being announced by APNIC Region ASes: 94901
Total APNIC prefixes after maximum aggregation: 30993
APNIC Deaggregation factor: 3.06
Prefixes being announced from the APNIC address blocks: 91366
Unique aggregates announced from the APNIC address blocks: 38386
APNIC Region origin ASes present in the Internet Routing Table: 4595
APNIC Prefixes per ASN: 19.88
APNIC Region origin ASes announcing only one prefix: 1267
APNIC Region transit ASes present in the Internet Routing Table: 709
Average APNIC Region AS path length visible: 4.5
Max APNIC Region AS path length visible: 19
Number of APNIC region 32-bit ASNs visible in the Routing Table: 107
Number of APNIC addresses announced to Internet: 629961312
Equivalent to 37 /8s, 140 /16s and 114 /24s
Percentage of available APNIC address space announced: 79.9

APNIC AS Blocks 4608-4864, 7467-7722, 9216-10239, 17408-18431
(pre-ERX allocations) 23552-24575, 37888-38911, 45056-46079, 55296-56319,
58368-59391, 131072-132095, 132096-133119
APNIC Address Blocks 1/8, 14/8, 27/8, 36/8, 39/8, 42/8, 43/8,
49/8, 58/8, 59/8, 60/8, 61/8, 101/8, 103/8,
106/8, 110/8, 111/8, 112/8, 113/8, 114/8, 115/8,
116/8, 117/8, 118/8, 119/8, 120/8, 121/8, 122/8,
123/8, 124/8, 125/8, 126/8, 133/8, 175/8, 180/8,
182/8, 183/8, 202/8, 203/8, 210/8, 211/8, 218/8,
219/8, 220/8, 221/8, 222/8, 223/8,

ARIN Region Analysis Summary
----------------------------

Prefixes being announced by ARIN Region ASes: 146074
Total ARIN prefixes after maximum aggregation: 74424
ARIN Deaggregation factor: 1.96
Prefixes being announced from the ARIN address blocks: 118096
Unique aggregates announced from the ARIN address blocks: 48502
ARIN Region origin ASes present in the Internet Routing Table: 14750
ARIN Prefixes per ASN: 8.01
ARIN Region origin ASes announcing only one prefix: 5642
ARIN Region transit ASes present in the Internet Routing Table: 1570
Average ARIN Region AS path length visible: 4.0
Max ARIN Region AS path length visible: 25
Number of ARIN region 32-bit ASNs visible in the Routing Table: 12
Number of ARIN addresses announced to Internet: 804241600
Equivalent to 47 /8s, 239 /16s and 192 /24s
Percentage of available ARIN address space announced: 63.9

ARIN AS Blocks 1-1876, 1902-2042, 2044-2046, 2048-2106
(pre-ERX allocations) 2138-2584, 2615-2772, 2823-2829, 2880-3153
3354-4607, 4865-5119, 5632-6655, 6912-7466
7723-8191, 10240-12287, 13312-15359, 16384-17407
18432-20479, 21504-23551, 25600-26591,
26624-27647, 29696-30719, 31744-33791
35840-36863, 39936-40959, 46080-47103
53248-55295, 393216-394239
ARIN Address Blocks 3/8, 4/8, 6/8, 7/8, 8/8, 9/8, 11/8,
12/8, 13/8, 15/8, 16/8, 17/8, 18/8, 19/8,
20/8, 21/8, 22/8, 23/8, 24/8, 26/8, 28/8,
29/8, 30/8, 32/8, 33/8, 34/8, 35/8, 38/8,
40/8, 44/8, 45/8, 47/8, 48/8, 50/8, 52/8,
53/8, 54/8, 55/8, 56/8, 57/8, 63/8, 64/8,
65/8, 66/8, 67/8, 68/8, 69/8, 70/8, 71/8,
72/8, 73/8, 74/8, 75/8, 76/8, 96/8, 97/8,
98/8, 99/8, 100/8, 104/8, 107/8, 108/8, 173/8,
174/8, 184/8, 199/8, 204/8, 205/8, 206/8, 207/8,
208/8, 209/8, 214/8, 215/8, 216/8,

RIPE Region Analysis Summary
----------------------------

Prefixes being announced by RIPE Region ASes: 92054
Total RIPE prefixes after maximum aggregation: 51057
RIPE Deaggregation factor: 1.80
Prefixes being announced from the RIPE address blocks: 84520
Unique aggregates announced from the RIPE address blocks: 54569
RIPE Region origin ASes present in the Internet Routing Table: 16099
RIPE Prefixes per ASN: 5.25
RIPE Region origin ASes announcing only one prefix: 7968
RIPE Region transit ASes present in the Internet Routing Table: 2528
Average RIPE Region AS path length visible: 4.7
Max RIPE Region AS path length visible: 33
Number of RIPE region 32-bit ASNs visible in the Routing Table: 1123
Number of RIPE addresses announced to Internet: 491918016
Equivalent to 29 /8s, 82 /16s and 18 /24s
Percentage of available RIPE address space announced: 79.2

RIPE AS Blocks 1877-1901, 2043, 2047, 2107-2136, 2585-2614
(pre-ERX allocations) 2773-2822, 2830-2879, 3154-3353, 5377-5631
6656-6911, 8192-9215, 12288-13311, 15360-16383
20480-21503, 24576-25599, 28672-29695
30720-31743, 33792-35839, 38912-39935
40960-45055, 47104-52223, 56320-58367
196608-198655
RIPE Address Blocks 2/8, 5/8, 25/8, 31/8, 37/8, 46/8, 51/8,
62/8, 77/8, 78/8, 79/8, 80/8, 81/8, 82/8,
83/8, 84/8, 85/8, 86/8, 87/8, 88/8, 89/8,
90/8, 91/8, 92/8, 93/8, 94/8, 95/8, 109/8,
176/8, 178/8, 185/8, 193/8, 194/8, 195/8, 212/8,
213/8, 217/8,

LACNIC Region Analysis Summary
------------------------------

Prefixes being announced by LACNIC Region ASes: 36178
Total LACNIC prefixes after maximum aggregation: 7900
LACNIC Deaggregation factor: 4.58
Prefixes being announced from the LACNIC address blocks: 35650
Unique aggregates announced from the LACNIC address blocks: 18604
LACNIC Region origin ASes present in the Internet Routing Table: 1546
LACNIC Prefixes per ASN: 23.06
LACNIC Region origin ASes announcing only one prefix: 446
LACNIC Region transit ASes present in the Internet Routing Table: 281
Average LACNIC Region AS path length visible: 4.5
Max LACNIC Region AS path length visible: 18
Number of LACNIC region 32-bit ASNs visible in the Routing Table: 373
Number of LACNIC addresses announced to Internet: 92910720
Equivalent to 5 /8s, 137 /16s and 180 /24s
Percentage of available LACNIC address space announced: 61.5

LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247,
262144-263167 plus ERX transfers
LACNIC Address Blocks 177/8, 179/8, 181/8, 186/8, 187/8, 189/8, 190/8,
200/8, 201/8,

AfriNIC Region Analysis Summary
-------------------------------

Prefixes being announced by AfriNIC Region ASes: 8596
Total AfriNIC prefixes after maximum aggregation: 2051
AfriNIC Deaggregation factor: 4.19
Prefixes being announced from the AfriNIC address blocks: 6670
Unique aggregates announced from the AfriNIC address blocks: 2035
AfriNIC Region origin ASes present in the Internet Routing Table: 498
AfriNIC Prefixes per ASN: 13.39
AfriNIC Region origin ASes announcing only one prefix: 157
AfriNIC Region transit ASes present in the Internet Routing Table: 108
Average AfriNIC Region AS path length visible: 4.6
Max AfriNIC Region AS path length visible: 25
Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 4
Number of AfriNIC addresses announced to Internet: 27690752
Equivalent to 1 /8s, 166 /16s and 135 /24s
Percentage of available AfriNIC address space announced: 41.3

AfriNIC AS Blocks 36864-37887, 327680-328703 & ERX transfers
AfriNIC Address Blocks 41/8, 102/8, 105/8, 197/8,

APNIC Region per AS prefix count summary
----------------------------------------

ASN No of nets /20 equiv MaxAgg Description
4766 2510 11108 968 Korea Telecom (KIX)
17974 1648 511 36 PT TELEKOMUNIKASI INDONESIA
7545 1625 303 88 TPG Internet Pty Ltd
4755 1528 378 171 TATA Communications formerly
7552 1394 1064 7 Vietel Corporation
9829 1166 989 28 BSNL National Internet Backbo
9583 1114 83 512 Sify Limited
4808 1093 2095 313 CNCGROUP IP network: China169
24560 964 343 218 Bharti Airtel Ltd., Telemedia
18101 951 119 148 Reliance Infocom Ltd Internet

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-APNIC

ARIN Region per AS prefix count summary
---------------------------------------

ASN No of nets /20 equiv MaxAgg Description
6389 3543 3814 219 bellsouth.net, inc.
7029 2799 1016 199 Windstream Communications Inc
18566 2093 383 177 Covad Communications
1785 1847 680 122 PaeTec Communications, Inc.
4323 1621 1077 387 Time Warner Telecom
20115 1595 1545 624 Charter Communications
22773 1496 2909 103 Cox Communications, Inc.
30036 1418 256 671 Mediacom Communications Corp
19262 1395 4728 400 Verizon Global Networks
7018 1310 7029 858 AT&T WorldNet Services

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-ARIN

RIPE Region per AS prefix count summary
---------------------------------------

ASN No of nets /20 equiv MaxAgg Description
8402 1550 416 14 Corbina telecom
6830 646 1927 411 UPC Distribution Services
34984 596 110 184 BILISIM TELEKOM
20940 551 182 433 Akamai Technologies European
3320 504 8168 389 Deutsche Telekom AG
12479 480 596 9 Uni2 Autonomous System
3292 478 2074 406 TDC Tele Danmark
8866 463 133 26 Bulgarian Telecommunication C
31148 408 22 114 FreeNet ISP
8551 402 354 43 Bezeq International

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-RIPE

LACNIC Region per AS prefix count summary
-----------------------------------------

ASN No of nets /20 equiv MaxAgg Description
10620 1706 316 157 TVCABLE BOGOTA
28573 1488 1043 79 NET Servicos de Comunicao S.A
8151 1437 2937 346 UniNet S.A. de C.V.
7303 1238 751 173 Telecom Argentina Stet-France
27947 595 72 84 Telconet S.A
22047 580 322 17 VTR PUNTO NET S.A.
6503 565 434 68 AVANTEL, S.A.
7738 553 1050 31 Telecomunicacoes da Bahia S.A
3816 539 234 96 Empresa Nacional de Telecomun
11172 525 85 95 Servicios Alestra S.A de C.V

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-LACNIC

AfriNIC Region per AS prefix count summary
------------------------------------------

ASN No of nets /20 equiv MaxAgg Description
24863 789 146 36 LINKdotNET AS number
8452 704 446 12 TEDATA
15475 443 74 8 Nile Online
36992 283 415 21 Etisalat MISR
3741 281 939 230 The Internet Solution
15706 241 32 6 Sudatel Internet Exchange Aut
6713 235 519 14 Itissalat Al-MAGHRIB
33776 221 13 8 Starcomms Nigeria Limited
29571 218 17 13 Ci Telecom Autonomous system
12258 196 28 57 Vodacom Internet Company

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-AFRINIC

Global Per AS prefix count summary
----------------------------------

ASN No of nets /20 equiv MaxAgg Description
6389 3543 3814 219 bellsouth.net, inc.
7029 2799 1016 199 Windstream Communications Inc
4766 2510 11108 968 Korea Telecom (KIX)
18566 2093 383 177 Covad Communications
1785 1847 680 122 PaeTec Communications, Inc.
10620 1706 316 157 TVCABLE BOGOTA
17974 1648 511 36 PT TELEKOMUNIKASI INDONESIA
7545 1625 303 88 TPG Internet Pty Ltd
4323 1621 1077 387 Time Warner Telecom
20115 1595 1545 624 Charter Communications

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet

Global Per AS Maximum Aggr summary
----------------------------------

ASN No of nets Net Savings Description
7029 2799 2600 Windstream Communications Inc
18566 2093 1916 Covad Communications
1785 1847 1725 PaeTec Communications, Inc.
17974 1648 1612 PT TELEKOMUNIKASI INDONESIA
10620 1706 1549 TVCABLE BOGOTA
4766 2510 1542 Korea Telecom (KIX)
7545 1625 1537 TPG Internet Pty Ltd
8402 1550 1536 Corbina telecom
28573 1488 1409 NET Servicos de Comunicao S.A
22773 1496 1393 Cox Communications, Inc.

Complete listing at http://thyme.rand.apnic.net/current/data-CIDRnet

List of Unregistered Origin ASNs (Global)
-----------------------------------------

Bad AS Designation Network Transit AS Description
15132 UNALLOCATED 12.9.150.0/24 7018 AT&T WorldNet Servic
32567 UNALLOCATED 12.14.170.0/24 4323 Time Warner Telecom
32567 UNALLOCATED 12.25.107.0/24 4323 Time Warner Telecom
25639 UNALLOCATED 12.41.169.0/24 7018 AT&T WorldNet Servic
13317 UNALLOCATED 12.44.10.0/24 7018 AT&T WorldNet Servic
23502 UNALLOCATED 12.44.44.0/24 7018 AT&T WorldNet Servic
17300 UNALLOCATED 12.45.103.0/24 7018 AT&T WorldNet Servic
17300 UNALLOCATED 12.45.110.0/24 701 UUNET Technologies,
16476 UNALLOCATED 12.46.27.0/24 7018 AT&T WorldNet Servic
32873 UNALLOCATED 12.46.100.0/23 10912 InterNAP Network Ser

Complete listing at http://thyme.rand.apnic.net/current/data-badAS

Prefixes from private and non-routed address space (Global)
-----------------------------------------------------------

Prefix Origin AS Description
128.0.0.0/21 12654 RIPE NCC RIS Project
128.0.0.0/16 12654 RIPE NCC RIS Project
128.0.24.0/24 12654 RIPE NCC RIS Project

Complete listing at http://thyme.rand.apnic.net/current/data-dsua

Advertised Unallocated Addresses
--------------------------------

Network Origin AS Description
24.225.128.0/18 36377 Comcast Telecommunications, I
24.225.192.0/23 36377 Comcast Telecommunications, I
24.225.192.0/18 36377 Comcast Telecommunications, I
24.225.224.0/21 36377 Comcast Telecommunications, I
24.225.237.0/24 36377 Comcast Telecommunications, I
24.225.248.0/21 36377 Comcast Telecommunications, I
41.222.79.0/24 37345 MEDALLION Communications
41.223.92.0/22 36936 >>UNKNOWN<<
62.61.220.0/24 24974 Tachyon Europe BV - Wireless
62.61.221.0/24 24974 Tachyon Europe BV - Wireless

Complete listing at http://thyme.rand.apnic.net/current/data-add-IANA

Number of prefixes announced per prefix length (Global)
-------------------------------------------------------

/1:0 /2:0 /3:0 /4:0 /5:0 /6:0
/7:0 /8:19 /9:12 /10:27 /11:81 /12:236
/13:465 /14:808 /15:1422 /16:12017 /17:6061 /18:10096
/19:19970 /20:27607 /21:27716 /22:37570 /23:35359 /24:198809
/25:1150 /26:1359 /27:761 /28:162 /29:4 /30:0
/31:0 /32:5

Advertised prefixes smaller than registry allocations
-----------------------------------------------------

ASN No of nets Total ann. Description
7029 2459 2799 Windstream Communications Inc
6389 2184 3543 bellsouth.net, inc.
18566 2042 2093 Covad Communications
10620 1601 1706 TVCABLE BOGOTA
8402 1526 1550 Corbina telecom
30036 1378 1418 Mediacom Communications Corp
11492 1117 1154 Cable One
1785 1057 1847 PaeTec Communications, Inc.
7011 1051 1168 Citizens Utilities
22773 958 1496 Cox Communications, Inc.

Complete listing at http://thyme.rand.apnic.net/current/data-sXXas-nos

Number of /24s announced per /8 block (Global)
----------------------------------------------

1:409 2:484 4:15 5:1 6:3 8:356
12:1966 13:1 14:539 15:11 16:3 17:7
20:9 23:63 24:1682 27:1032 31:688 32:65
33:2 34:2 36:4 38:758 39:1 40:110
41:2688 42:60 43:1 44:3 46:1038 47:3
49:299 50:450 52:13 55:8 56:2 57:47
58:919 59:492 60:364 61:1132 62:1095 63:1971
64:4063 65:2297 66:4321 67:2012 68:1175 69:3140
70:905 71:387 72:1803 74:2629 75:425 76:319
77:889 78:881 79:481 80:1136 81:838 82:512
83:518 84:622 85:1154 86:402 87:930 88:355
89:1591 90:236 91:4242 92:536 93:1552 94:1305
95:1112 96:427 97:285 98:938 99:37 101:232
103:465 106:7 107:91 108:78 109:1184 110:666
111:807 112:362 113:482 114:618 115:711 116:882
117:722 118:891 119:1272 120:235 121:670 122:1578
123:1019 124:1354 125:1355 128:246 129:174 130:163
131:625 132:151 133:21 134:222 135:54 136:213
137:143 138:287 139:112 140:492 141:253 142:389
143:407 144:493 145:64 146:472 147:219 148:636
149:270 150:163 151:194 152:449 153:172 154:7
155:390 156:208 157:361 158:154 159:490 160:332
161:209 162:375 163:173 164:511 165:369 166:543
167:444 168:806 169:145 170:881 171:87 172:4
173:1738 174:702 175:431 176:314 177:367 178:1096
180:1144 181:38 182:652 183:236 184:393 185:1
186:1405 187:779 188:965 189:1162 190:5219 192:5930
193:5054 194:3549 195:3108 196:1265 197:164 198:3621
199:4215 200:5518 201:1699 202:8542 203:8534 204:4313
205:2378 206:2670 207:2813 208:4024 209:3588 210:2736
211:1421 212:2080 213:1805 214:786 215:97 216:4923
217:1603 218:543 219:344 220:1256 221:487 222:324
223:272

End of report
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